2007 ISUZU KB P190 automatic transmission

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–3
Circuit Description ............................................................................................................................................... 43
Conditions for Running the DTC ........................................................................................................................ 43
DTC P0711 ...................................................................................................................................................... 43
DTC P0712 ...................................................................................................................................................... 43
DTC P0713 ...................................................................................................................................................... 44
Conditions for Setting the DTC................................................................................................. .......................... 44
DTC P0711 ...................................................................................................................................................... 44
DTC P0712 ...................................................................................................................................................... 44
DTC P0713 ...................................................................................................................................................... 44
Action Taken When the DTC Sets ................................................................................................. ..................... 44
Conditions for Clearing the DTC ........................................................................................................................ 44
Diagnostic Aids .................................................................................................................................................... 45
Test Description ................................................................................................................................................... 45
DTC P0711 to P0713 Diagnostic Table ............................................................................................ ................... 45
4.14 DTC P0719 – Brake Switch Circuit High Input (Stuck On) ......................................................................... ....... 47
DTC Description ................................................................................................................................................... 47
Circuit Description ............................................................................................................................................... 47
Conditions for Running the DTC ................................................................................................. ....................... 47
Conditions for Setting the DTC........................................................................................................................... 47
Action Taken When the DTC Sets ................................................................................................. ..................... 47
Conditions for Clearing the DTC ........................................................................................................................ 47
Diagnostic Aids .................................................................................................................................................... 48
Test Description ................................................................................................................................................... 48
DTC P0719 Diagnostic Table..................................................................................................... .......................... 48
4.15 DTC P0722 – Vehicle Speed Sensor Circuit Low Voltage........................................................................... ...... 49
DTC Description ................................................................................................................................................... 49
Circuit Description ............................................................................................................................................... 49
Conditions for Running the DTC ................................................................................................. ....................... 49
Conditions for Setting the DTC........................................................................................................................... 49
Action Taken When the DTC Sets ................................................................................................. ..................... 50
Conditions for Clearing the DTC ........................................................................................................................ 50
Diagnostic Aids .................................................................................................................................................... 50
Test Description ................................................................................................................................................... 50
DTC P0722 Diagnostic Table..................................................................................................... .......................... 50
4.16 DTC P0723 – Vehicle Speed Sensor Circuit Intermittent .......................................................................... ........ 52
DTC Description ................................................................................................................................................... 52
Circuit Description ............................................................................................................................................... 52
Conditions for Running the DTC ................................................................................................. ....................... 52
Conditions for Setting the DTC........................................................................................................................... 53
Action Taken When the DTC Sets ................................................................................................. ..................... 53
Conditions for Clearing the DTC ........................................................................................................................ 53
Diagnostic Aids .................................................................................................................................................... 53
Test Description ................................................................................................................................................... 53
DTC P0723 Diagnostic Table..................................................................................................... .......................... 54
4.17 DTC P0724 – Brake Switch Circuit Low Input (Stuck Off) ................................................................................ 55
DTC Description ................................................................................................................................................... 55
Circuit Description ............................................................................................................................................... 55
Conditions for Running the DTC ................................................................................................. ....................... 56
Conditions for Setting the DTC........................................................................................................................... 56
Action Taken When the DTC Sets ................................................................................................. ..................... 56
Conditions for Clearing the DTC ........................................................................................................................ 56
Diagnostic Aids .................................................................................................................................................... 56
Test Description ................................................................................................................................................... 56
DTC P0724 Diagnostic Table..................................................................................................... .......................... 56
4.18 DTC P0741 – Torque Converter Clutch System – Stuck Off......................................................................... .... 57
DTC Description ................................................................................................................................................... 57
Circuit Description ............................................................................................................................................... 57
Conditions for Running the DTC ................................................................................................. ....................... 58
Conditions for Setting the DTC........................................................................................................................... 58
Action Taken When the DTC Sets ................................................................................................. ..................... 58

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–4
Conditions for Clearing the DTC ........................................................................................................................ 58
Diagnostic Aids .................................................................................................................................................... 58
Test Description ................................................................................................................................................... 58
DTC P0741 Diagnostic Table..................................................................................................... .......................... 59
4.19 DTC P0742 – Torque Converter Clutch System – Stuck On .......................................................................... ... 60
DTC Description ................................................................................................................................................... 60
Circuit Description ............................................................................................................................................... 60
Conditions for Running the DTC ................................................................................................. ....................... 60
Conditions for Setting the DTC........................................................................................................................... 61
Action Taken When the DTC Sets ................................................................................................. ..................... 61
Conditions for Clearing the DTC ........................................................................................................................ 61
Diagnostic Aids .................................................................................................................................................... 61
Test Description ................................................................................................................................................... 61
DTC P0742 Diagnostic Table..................................................................................................... .......................... 61
4.20 DTC P0751 – 1-2 Shift Solenoid Valve Performance – No First or Fourth Gear ............................................. 63
DTC Description ................................................................................................................................................... 63
Circuit Description ............................................................................................................................................... 63
Conditions for Running the DTC ................................................................................................. ....................... 63
Conditions for Setting the DTC........................................................................................................................... 63
Action Taken When the DTC Sets ................................................................................................. ..................... 63
Conditions for Clearing the DTC ........................................................................................................................ 63
Diagnostic Aids .................................................................................................................................................... 64
Test Description ................................................................................................................................................... 64
DTC P0751 Diagnostic Table..................................................................................................... .......................... 64
4.21 DTC P0752 – 1-2 Shift Solenoid Valve Performance – No Second or Third Gear........................................... 65
DTC Description ................................................................................................................................................... 65
Circuit Description ............................................................................................................................................... 65
Conditions for Running the DTC ................................................................................................. ....................... 65
Conditions for Setting the DTC........................................................................................................................... 65
Action Taken When the DTC Sets ................................................................................................. ..................... 66
Conditions for Clearing the DTC ........................................................................................................................ 66
Diagnostic Aids .................................................................................................................................................... 66
Test Description ................................................................................................................................................... 66
DTC P0752 Diagnostic Table..................................................................................................... .......................... 66
4.22 DTC P0756 – 2-3 Shift Solenoid Valve Performance – No First or Second Gear ............................................ 68
DTC Description ................................................................................................................................................... 68
Circuit Description ............................................................................................................................................... 68
Conditions for Running the DTC ................................................................................................. ....................... 68
Conditions for Setting the DTC........................................................................................................................... 68
Action Taken When the DTC Sets ................................................................................................. ..................... 68
Conditions for Clearing the DTC ........................................................................................................................ 68
Diagnostic Aids .................................................................................................................................................... 69
Test Description ................................................................................................................................................... 69
DTC P0756 Diagnostic Table..................................................................................................... .......................... 69
4.23 DTC P0757 – 2-3 Shift Solenoid Valve Performance – No Third or Fourth Gear ............................................ 70
DTC Description ................................................................................................................................................... 70
Circuit Description ............................................................................................................................................... 70
Conditions for Running the DTC ................................................................................................. ....................... 71
Conditions for Setting the DTC........................................................................................................................... 71
Action Taken When the DTC Sets ................................................................................................. ..................... 71
Conditions for Clearing the DTC ........................................................................................................................ 71
Diagnostic Aids .................................................................................................................................................... 71
Test Description ................................................................................................................................................... 71
DTC P0757 Diagnostic Table..................................................................................................... .......................... 72
4.24 DTC P0787 – 3-2 Shift Solenoid Control Circuit Low Voltage .......................................................................... 73
DTC Description ................................................................................................................................................... 73
Circuit Description ............................................................................................................................................... 73
Conditions for Running the DTC ................................................................................................. ....................... 73
Conditions for Setting the DTC........................................................................................................................... 73
Action Taken When the DTC Sets ................................................................................................. ..................... 73

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–5
Conditions for Clearing the DTC ........................................................................................................................ 73
Test Description ................................................................................................................................................... 74
DTC P0787 Diagnostic Table..................................................................................................... .......................... 74
4.25 DTC P0788 – 3-2 Shift Solenoid Control Circuit High Voltage .................................................................... ..... 77
DTC Description ................................................................................................................................................... 77
Circuit Description ............................................................................................................................................... 77
Conditions for Running the DTC ................................................................................................. ....................... 77
Conditions for Setting the DTC........................................................................................................................... 77
Action Taken When the DTC Sets ................................................................................................. ..................... 77
Conditions for Clearing the DTC ........................................................................................................................ 77
Test Description ................................................................................................................................................... 78
DTC P0788 Diagnostic Table..................................................................................................... .......................... 78
4.26 DTC P0894 – Transmission Component Slipping .................................................................................... ......... 79
DTC Description ................................................................................................................................................... 79
Circuit Description ............................................................................................................................................... 79
Conditions for Running the DTC ................................................................................................. ....................... 80
Conditions for Setting the DTC........................................................................................................................... 80
Action Taken When the DTC Sets ................................................................................................. ..................... 81
Conditions for Clearing the DTC ........................................................................................................................ 81
Diagnostic Aids .................................................................................................................................................... 81
Test Description ................................................................................................................................................... 81
DTC P0894 Diagnostic Table..................................................................................................... .......................... 81
4.27 DTC P0961 – Line Pressure Control Solenoid System Performance .............................................................. 86
DTC Description ................................................................................................................................................... 86
Circuit Description ............................................................................................................................................... 86
Conditions for Running the DTC ................................................................................................. ....................... 86
Conditions for Setting the DTC........................................................................................................................... 86
Action Taken When the DTC Sets ................................................................................................. ..................... 86
Conditions for Clearing the DTC ........................................................................................................................ 87
Diagnostic Aids .................................................................................................................................................... 87
Test Description ................................................................................................................................................... 87
DTC P0961 Diagnostic Table..................................................................................................... .......................... 87
4.28 DTC P0973 – 1-2 Shift Solenoid Control Circuit Low Voltage .......................................................................... 89
DTC Description ................................................................................................................................................... 89
Circuit Description ............................................................................................................................................... 89
Conditions for Running the DTC ................................................................................................. ....................... 90
Conditions for Setting the DTC........................................................................................................................... 90
Action Taken When the DTC Sets ................................................................................................. ..................... 90
Conditions for Clearing the DTC ........................................................................................................................ 90
Test Description ................................................................................................................................................... 90
DTC P0973 Diagnostic Table..................................................................................................... .......................... 91
4.29 DTC P0974 – 1-2 Shift Solenoid Control Circuit High Voltage .................................................................... ..... 93
DTC Description ................................................................................................................................................... 93
Circuit Description ............................................................................................................................................... 93
Conditions for Running the DTC ................................................................................................. ....................... 94
Conditions for Setting the DTC........................................................................................................................... 94
Action Taken When the DTC Sets ................................................................................................. ..................... 94
Conditions for Clearing the DTC ........................................................................................................................ 94
Test Description ................................................................................................................................................... 94
DTC P0974 Diagnostic Table..................................................................................................... .......................... 94
4.30 DTC P0976 – 2-3 Shift Solenoid Control Circuit Low Voltage .......................................................................... 96
DTC Description ................................................................................................................................................... 96
Circuit Description ............................................................................................................................................... 96
Conditions for Running the DTC ................................................................................................. ....................... 96
Conditions for Setting the DTC........................................................................................................................... 97
Action Taken When the DTC Sets ................................................................................................. ..................... 97
Conditions for Clearing the DTC ........................................................................................................................ 97
Test Description ................................................................................................................................................... 97
DTC P0976 Diagnostic Table..................................................................................................... .......................... 97
4.31 DTC P0977 – 2-3 Shift Solenoid Control Circuit High Voltage .................................................................... ... 100

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–6
DTC Description ................................................................................................................................................. 100
Circuit Description ............................................................................................................................................. 100
Conditions for Running the DTC ................................................................................................. ..................... 101
Conditions for Setting the DTC......................................................................................................................... 101
Action Taken When the DTC Sets ................................................................................................. ................... 101
Conditions for Clearing the DTC ...................................................................................................................... 101
Test Description ................................................................................................................................................. 101
DTC P0977 Diagnostic Table..................................................................................................... ........................ 101
4.32 DTC P1810, P1815 and P1816 – Transmission Fluid Pressure Position Switch........................................... 103
DTC Description ................................................................................................................................................. 103
Circuit Description ............................................................................................................................................. 103
Conditions for Running the DTC ................................................................................................. ..................... 104
DTC P1810 .................................................................................................................................................... 104
DTC P1815 .................................................................................................................................................... 104
DTC P1816 .................................................................................................................................................... 104
Conditions for Setting the DTC................................................................................................. ........................ 104
DTC P1810 .................................................................................................................................................... 104
DTC P1815 .................................................................................................................................................... 104
DTC P1816 .................................................................................................................................................... 104
Action Taken When the DTC Sets ................................................................................................. ................... 104
Conditions for Clearing the DTC ...................................................................................................................... 105
Diagnostic Aids .................................................................................................................................................. 105
Test Description ................................................................................................................................................. 105
DTC P1810, P1815 and P1816 Diagnostic Table.................................................................................... .......... 105
4.33 DTC P2763 – Torque Converter Clutch Pressure Control Solenoid Control Circuit High Voltage ............. 108
DTC Description ................................................................................................................................................. 108
Circuit Description ............................................................................................................................................. 108
Conditions for Running the DTC ................................................................................................. ..................... 108
Conditions for Setting the DTC......................................................................................................................... 108
Action Taken When the DTC Sets ................................................................................................. ................... 108
Conditions for Clearing the DTC ...................................................................................................................... 108
Test Description ................................................................................................................................................. 109
DTC P2763 Diagnostic Table..................................................................................................... ........................ 109
4.34 DTC P2764 – Torque Converter Clutch Pressure Control Solenoid Control Circuit Low Voltage .............. 111
DTC Description ................................................................................................................................................. 111
Circuit Description ............................................................................................................................................. 111
Conditions for Running the DTC ................................................................................................. ..................... 111
Conditions for Setting the DTC......................................................................................................................... 111
Action Taken When the DTC Sets ................................................................................................. ................... 111
Conditions for Clearing the DTC ...................................................................................................................... 111
Test Description ................................................................................................................................................. 112
DTC P2764 Diagnostic Table..................................................................................................... ........................ 112
4.35 DTC P2769 – Torque Converter Clutch Enable Solenoid Control Circuit Low Voltage ............................... 115
DTC Description ................................................................................................................................................. 115
Circuit Description ............................................................................................................................................. 115
Conditions for Running the DTC ................................................................................................. ..................... 115
Conditions for Setting the DTC......................................................................................................................... 115
Action Taken When the DTC Sets ................................................................................................. ................... 115
Conditions for Clearing the DTC ...................................................................................................................... 116
Diagnostic Aids .................................................................................................................................................. 116
Test Description ................................................................................................................................................. 116
DTC P2769 Diagnostic Table..................................................................................................... ........................ 116
4.36 DTC P2770 – Torque Converter Clutch Enable Solenoid Control Circuit High Voltage............................... 119
DTC Description ................................................................................................................................................. 119
Circuit Description ............................................................................................................................................. 119
Conditions for Running the DTC ................................................................................................. ..................... 119
Conditions for Setting the DTC......................................................................................................................... 119
Action Taken When the DTC Sets ................................................................................................. ................... 120
Conditions for Clearing the DTC ...................................................................................................................... 120
Test Description ................................................................................................................................................. 120

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–7
DTC P2770 Diagnostic Table............................................................................................................................. 120
4.37 DTC U0073 and U0100 – CAN-Bus No Communication With ECM (Engine Control Module)...................... 121
DTC Description ................................................................................................................................................. 121
Circuit Description ............................................................................................................................................. 121
Conditions for Running the DTC ................................................................................................. ..................... 121
Conditions for Setting the DTC......................................................................................................................... 121
DTC U0073 .................................................................................................................................................... 121
DTC U0100 .................................................................................................................................................... 121
Action Taken When the DTC Sets ................................................................................................. ................... 122
Conditions for Clearing the DTC ...................................................................................................................... 122
Test Description ................................................................................................................................................. 122
DTC P0864 and U0101 Diagnostic Table........................................................................................... ............... 122
5 Electrical Specifications ....................................................................................................................124
5.1 Transmission Fluid Temperature (TFT) Sensor Specifications ..................................................................... 124
5.2 Range Reference................................................................................................................................................ 124
5.3 Transmission Fluid Pressure Manual Valve Position Switch Logic .............................................................. 125
5.4 Transmission Range Switch Logic................................................................................................................... 125
5.5 Component Resistance ..................................................................................................................................... 126
5.6 Shift Solenoid Valve State and Gear Ratio ...................................................................................................... 126
5.7 Line Pressure ..................................................................................................................................................... 126
6 Special Tools ......................................................................................................................................127



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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–8
1 General Information
1.1 Introduction
This Section covers the electrical diagnostic for the 4L60E automatic transmission when mated to a V6 engine.
1.2 General Description
The 4L60E automatic transmission incorporates electronic controls that utilise a transmission control module (TCM) to
control shift points through:
• the 1-2 and 2-3 shift solenoid valves,
• the 3-2 downshift solenoid valve,
• a torque converter clutch (TCC) solenoid valve,
• apply and release through the TCC pulse width modulated (PW M) solenoid valve, and
• line pressure through the pressure control (PC) solenoid valve.
Electrical signals from various sensors provide information to the TCM about the following:
• vehicle speed,
• throttle position,
• engine coolant temperature,
• transmission fluid temperature,
• gear range selector position,
• engine speed,
• converter turbine speed, and
• engine load braking and operating mode.
The TCM uses this information to determine the precise moment to upshift or downshift, apply or release the TCC and
what fluid pressure is needed to apply the clutches. This type of control provides consistent and precise shift points and
shift quality based on the operating conditions of the vehicle.
Figure 7C2 – 1 shows the location of the internal electronic components in the transmission.

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–9

Figure 7C2 – 1
Legend
1 Vehicle Speed Sensor 5 Torque Converter Clutch Pulse Width Modulation (TCC
PWM) Solenoid Valve
2 1-2 Shift Solenoid (Solenoid A) and 2-3 Shift Solenoid (Solenoid B) 6 Torque Converter Clutch (TCC) Solenoid Valve
3
Automatic Transmission Fluid Pressure (TFP) Manual Valve
Position 7 Pressure Control (PC) Solenoid Valve
4 3-2 Downshift Solenoid
Transmission Adaptive Functions
The 4L60E automatic transmission uses a line pressure control system, which has the ability to adapt the system line
pressure to compensate for normal wear within the transmission, such as the clutch pack fibre plates, seals, springs, etc.
The adapt feature is similar in function to the long term/short term fuel trim feature of the engine management system.
The 4L60E automatic transmission uses the adapt function for garage shifts, upshifts and torque converter clutch (TCC)
application. The TCM monitors the engine torque to determine if the shift is occurring too fast or too slow and adjusts the
pressure control solenoid to maintain the correct shift feel.

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–10
Limp Home Mode Description
If a major electrical system failure occurs which could affect vehicle safety or damage the transmission during normal
operation, the TCM enters a limp home mode. In the limp home mode, the transmission operates in the following
manner:
• The pressure control solenoid is off and the line pressure is at maximum to minimise clutch slippage.
• The TCC solenoid is off, therefore the torque converter clutch is disabled.
• The two shift solenoids are turned off. The transmission will operate in fourth gear if the vehicle has successfully
completed a 1-2 upshift in the current ignition cycle. If the vehicle has not completed a 1-2 upshift in the current
ignition cycle, the transmission will operate in third gear. If the transmission is operating in fourth gear, third gear
may be obtained if the engine is stopped briefly and re-started.
In limp home mode, the gear selector lever is ineffective at selecting forward gear ranges. In third or fourth gear, heat
builds up in the transmission quickly, particularly in stop and go traffic. Excessive heat build-up may cause transmission
failure if the vehicle is driven for extended distances in limp home mode.
1.3 Transmission Indicators and Messages
For information pertaining to the instrument cluster and the transmission information it displays, refer to the RA Rodeo
Owner Handbook.
1.4 Electronic Component Description
For all other electrical components not covered in this section, refer to General Motors Powertrain Group Electronically
Controlled Automatic Transmission Technician's Guide.
Transmission Control Module (TCM)
The Transmission Control Module (TCM) is located under the instrument panel, next to the brake pedal assembly and
connects directly to the transmission wiring harness. A single 49-way connector is used to make the connection between
the vehicle wiring harness and the TCM.
To access the connector for diagnosis:
1 Ensure the ignition switch is in the OFF position.
2 Disconnect the connector (1) from the transmission control module (TCM) (2) as follows, refer to Figure 7C2 – 2: a remove the securing pin (3),
b press the locking tab and swing the lever (4) to free the connector,
c remove the connector.

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ISUZU KB P190 2007