2007 ISUZU KB P190 sensor

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–23
TFP Gear: This parameter displays Park/Neutral, Reverse , Drive4 , Drive3 , Drive2 , Drive1 or Invalid . This parameter
is the decoded status of the three A/B/C inputs from the automatic transmission fluid pressure manual valve position
switch. If a valid combination of inputs is not detected, invalid will be displayed.
TFP Swi A/B/C: This parameter displays Open 12 V / Closed 0 V for each switch. This parameter indicates the statues
of the three inputs from the automatic transmission fluid pressure manual valve position switch assembly.
Throttle Position: This parameter displays a calculated value, which is determined by the accelerator pedal position and
the actual throttle position, used to optimise transmission controls. It represents the driver’s intended requested for
torque or acceleration. The range is 0-100%, 0% represents an idle or coast request and 100% represents a request for
wide open throttle (WOT).
Torque Converter Efficiency: This parameter displays a ratio of 0.00:1 to 2:1. The ratio is calculates by multiplying the
speed ratio by a value related to the ‘K factor’ of the torque converter. The ‘K factor’ is the looseness or tightness of the
torque converter for a given torque. The nearer the torque converter is to full coupling, i.e. 1:1, the closer the torque
converter efficiency number will be to 1.
TR Switch A/B/C/P: This parameter displays the status of the four inputs from the transmission range switch. Tech 2
displays Open 12V / Closed 0 V . Open 12 V indicates an ignition voltage input to the control module. Closed 0 V
indicates a zero voltage input to the control module.
Transmission Fluid Temperature: This parameter displays the input signal of the transmission fluid temperature sensor.
Transmission fluid temperature is high, 151°C, when signal voltage is low, 0 V. Transmission fluid temperature is low, -
40°C, when signal voltage is high, 5 V.
Transmission Hot Mode: This parameter displays the automatic transmission fluid temperature (TFT) and displays On
or Off . Off indicates the TFT has not exceeded 130°C. On indicates the TFT has exceeded 130°C and has not cooled to
120°C for greater than 5 seconds. These numbers are approximate and differ with transmissions.
Vehicle Speed: This parameter displays the speed at which the vehicle is travelling. Tech 2 displays vehicle speed as
kilometres per hour (km/h). The vehicle speed is calculates based on the input signal from the automatic transmission
output shaft speed sensor.
3.4 Miscellaneous Tests
Tech 2
Miscellaneous Tests Description
Shift Solenoid A •
The TCM commands the 1-2 shift solenoid valve on and off. Tech 2’s Shift Solenoid A
Parameter should match the commanded state. Tech 2’s Commanded Gear
parameter should correspond with the shift solenoid combination. Refer to
5.6 Shift Solenoid Valve State and Gear Ratio.
• When the ignition is on, and the engine is off, there no limits to this control. The
solenoid remains on until commanded off, and vice versa. W hen the test is exited, the
solenoid state is determined by the TCM.
• W hen the engine is running, the following control limits apply:
• Only sequential gear changes are allowed. For example, 1
st to 3rd is not allowed.
If a non-sequential gear change is attempted, the message Non-sequential
gear changes not allowed . Gear changes must be made in order appears
on Tech 2.
• The vehicle speed must be below a calibrated value. If the vehicle speed is too
high, the message Vehicle speed too high appears on Tech 2.
• The engine speed must be below a calibrated value. If the engine speed is too
high, the message Engine speed too high appears on Tech 2.
• Downshifts are allowed only when the vehicle speed is below a calibrated value.
If the vehicle speed is too high, the message Eng. is on and veh. speed to hi
for 3-2 or 2-1 downshift appears on Tech 2.
• The gear requested may not be greater than the current selected transmission
range (PRNDL). For example, 3
rd gear is not allowed if the transmission range is
D2. If the gear requested is greater than the current selected transmission
range, the message Eng. running and gear request is greater than the
current TR appears on Tech 2.
• The solenoid remains on until commanded off, and vice versa. W hen the test is
exited, the solenoid state is determined by the TCM.

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–28
7 Ensure that all wiring harness connectors are fitted correctly and secure.
8 W hen steam or pressure cleaning vehicle components, such as engines, transmissions, etc., do not direct the cleaning nozzle at any system electrical wiring harness connectors or components.
9 Do not clear any DTCs unless instructed.
10 The fault must be present when using the Diagnostic Trouble Code (DTC) Diagnostic Tables. Otherwise, misdiagnosis or replacement of good parts may occur.
11 Do not touch any electronic control module connector pins or soldered components on the circuit board. This is required to avoid the possibility of electrostatic discharge damage.
12 Use only the test equipment specified in the diagnostic tables, as other test equipment may give incorrect results or damage good components.
13 Electronic control modules are designed to withstand normal current draws associated with vehicle operation. However, the following fault conditions or incorrect test procedure may overload internal control module circuits and
irreparably damage the control module:
• A short to voltage fault condition in any of the control module low reference circuits may cause internal and/or
sensor damage. Therefore, any short to voltage fault condition in the control module low reference circuits
must be rectified before replacing a faulty component.
• A short to ground fault condition in any of the control module 5 volts reference circuits may cause internal
control module and/or sensor damage. Therefore, any short to ground fault condition in the control module 5
volt reference circuits must be rectified before replacing a faulty component.
• W hen using a test light to test an electrical circuit, do not use any of the control module low reference circuits
or 5 volts reference circuits as a reference point. Otherwise, excessive current draw from the test light may
damage the control module.
14 Disregard DTCs that set while performing the following diagnostic Steps:
• Using the Tech 2 output control function, or
• Disconnecting a control module system sensor connector then switching the ignition ON.
15 After completing the required diagnostics and service operations, road test the vehicle to ensure correct system operation.
4.4 Preliminary Checks
The Preliminary Checks is a set of visual and physical checks or inspections that may quickly identify a control module
system fault condition:
1 Refer to relevant Service Techlines for information regarding the fault condition.
2 Ensure that the battery is fully charged.
3 Inspect the battery connections for corrosion or a loose terminal.
4 Ensure that all relevant control module system related fuses are serviceable.
5 Inspect for incorrect aftermarket theft deterrent devices, lights or mobile phone installation.
6 Ensure that there is no speaker magnet positioned too close to any electronic module that contains relays.
7 Inspect the system wiring harness for proper connections, pinches or cuts.
8 Ensure that all control module related electrical wiring connectors are fitted correctly.
9 Inspect the control module ground connections for corrosion, loose terminal or incorrect position.
10 Ensure that the resistance between the control module housing and the battery ground cable is less than 0.5 ohms.
11 Check that the control module and its mounting bracket is secure.
12 Check all control module related components for correct installation.
13 Check the control module and related wiring harness routing to ensure that no rubbing or cutting of the wiring harness by sharp body components can occur.

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–29
4.5 Diagnostic Trouble Code Tables
The diagnostic system check and the DTC list, directs the technician to the appropriate diagnostic trouble code (DTC)
tables if there is a DTC currently stored in the TCM.
The diagnostic tables locate a faulty circuit or component through a logic based on the process of elimination. These
diagnostic tables are developed with the following assumptions:
• the vehicle functioned correctly at the time of assembly,
• there are no multiple faults, and
• the problem currently exists.
Understanding and the correct use of the diagnostic tables are essential to reduce diagnostic time and to prevent
misdiagnosis.
Multiple DTCs Fault Condition
Some fault conditions trigger multiple component DTCs even if the fault condition exists only on a single component. If
there are multiple DTCs stored in the TCM, the service technician must view and record all DTCs logged.
Relationship between the logged DTCs can then be analysed to determine the source of the fault condition. Always
begin the diagnostic process with the DTC table of the fault condition that may trigger other DTCs to set.
The following fault conditions may trigger multiple DTCs:
• a fault in the serial data communication circuit,
• a system voltage that is too low may cause incorrect transmission tem operation or transmission component
malfunction,
• a system voltage that is too high may damage the TCM and/or other components,
• fault condition in the TCM Read Only Memory (ROM) or Random Access Memory (RAM),
• fault condition in the TCM internal circuitry or programming, or
• improperly connected sensor or component wiring connector.
If there are no obvious faults to begin a multiple DTC fault condition diagnostic procedure, refer to the Conditions for
Running the DTC in each diagnostic.
4.6 Diagnostic Trouble Code Definitions
The TCM constantly performs self-diagnostic tests on the transmission and it components. W hen the TCM detects a fault
condition in the transmission operating parameters, the TCM sets a DTC to represents that fault condition. The following
are the types of DTCs programmed in the TCM. In addition, DTCs are classified as either Current or History DTC.
• Type A – Emission Related DTCs,
• Type B – Emission Related DTCs, and
• Type C – Non-emission Related DTCs.
NOTE
Depending on the type of DTC set, the TCM may
command the malfunction indiciator lamp (MIL) to
display on the instrument cluster and warn the
driver there is a fault in the transmission. Refer to
the RA Rodeo Owner Manual for further
information on the MIL.
Type A – Emission Related DTCs
The TCM takes the following action when a Type A DTC runs and fails:
• sets a current Type A DTC that represents the fault condition,
• illuminates the MIL, and

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–31
Test Description
The following numbers refer to the step numbers in the diagnostic table:
1 Within this document there are a number of requirements that must be met before you can start diagnosis. Refer to 4.2 Basic Knowledge Required, 4.3 Diagnostic Precautions and 4.4 Preliminary Checks.
2 Checks if there is data communication between Tech 2 and the TCM.
3 Checks if the TCM has set any DTCs. If no DTCs have set, the functional test must be performed, which diagnoses the hydro-mechanical functions of the transmission.
Step Action Yes No
1 Have you read the Basic Diagnostic Requirements, Diagnostic
Precautions and Preliminary Checks? Go to Step 3 Refer to Note 1
2
1 Connect Tech 2 to the DLC.
2 On Tech 2 select: Transmission / Automatic Transmission
and follow the instruction on Tech 2.
Does Tech 2 display the TCM specifications? Go to Step 4 Refer to 6E1
Powertrain Interface
Module
3 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information
Does Tech 2 display any DTCs?
Go to
4.8 Diagnostic Trouble Code List Perform the
Functional Test, refer to 7C3 Automatic
Transmission –
4L60E – Hydraulic and Mechanical Diagnosis
4.8 Diagnostic Trouble Code List
NOTE
If the DTC listed on Tech 2 is not contained in
this list, refer to OD Vehicle Diagnostics.
DTC Type Description Diagnostic Table
P0218 C Transmission Fluid Overtemperature 4.9 DTC P0218 – Transmission
Fluid Overtemperature
P0562 C System Voltage Low 4.10 DTC P0562 – System
Voltage Low
P0563 C System Voltage High 4.11 DTC P0563 – System
Voltage High
P0601 A Transmission Control Module (TCM) Read Only Memory
(ROM) 4.12 DTC P0601 to P0604 or
P1621 – TCM Malfunction
P0602 A Transmission Control Module (TCM) Not Programmed 4.12 DTC P0601 to P0604 or
P1621 – TCM Malfunction
P0603 A Transmission Control Module (TCM) Random Access
Memory (RAM) 4.12 DTC P0601 to P0604 or
P1621 – TCM Malfunction
P0604 A Transmission Control Module (TCM) Long Term Memory
Performance 4.12 DTC P0601 to P0604 or
P1621 – TCM Malfunction
P0711 C Transmission Fluid Temperature (TFT) Sensor
Performance 4.13 DTC P0711 to P0713 –
Transmission Fluid Temperature
Sensor
P0712 C Transmission Fluid Temperature (TFT) Sensor Circuit Low
Voltage 4.13 DTC P0711 to P0713 –
Transmission Fluid Temperature
Sensor

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–32
DTC Type Description Diagnostic Table
P0713 C Transmission Fluid Temperature (TFT) Sensor Circuit High
Voltage 4.13 DTC P0711 to P0713 –
Transmission Fluid Temperature
Sensor
P0719 C Brake Switch Circuit High Input (Stuck On) 4.14 DTC P0719 – Brake Switch
Circuit High Input (Stuck On)
P0722 B Vehicle Speed Sensor Circuit Low Voltage 4.15 DTC P0722 – Vehicle Speed
Sensor Circuit Low Voltage
P0723 B Vehicle Speed Sensor Circuit Intermittent 4.16 DTC P0723 – Vehicle Speed
Sensor Circuit Intermittent
P0724 C Brake Switch Circuit Low Input (Stuck Off) 4.17 DTC P0724 – Brake Switch
Circuit Low Input (Stuck Off)
P0741 B Torque Converter Clutch (TCC) System – Stuck Off 4.18 DTC P0741 – Torque
Converter Clutch System – Stuck Off
P0742 B Torque Converter Clutch (TCC) System – Stuck On 4.17 DTC P0724 – Brake Switch
Circuit Low Input (Stuck Off)
P0751 B 1-2 Shift Solenoid (SS) Valve Performance – No First or
Fourth Gear 4.20 DTC P0751 – 1-2 Shift
Solenoid Valve Performance – No
First or Fourth Gear
P0752 B 1-2 Shift Solenoid (SS) Valve Performance – No Second or
Third Gear 4.21 DTC P0752 – 1-2 Shift
Solenoid Valve Performance – No
Second or Third Gear
P0756 A 2-3 Shift Solenoid (SS) Valve Performance – No First or
Second Gear 4.22 DTC P0756 – 2-3 Shift
Solenoid Valve Performance – No
First or Second Gear
P0757 A 2-3 Shift Solenoid (SS) Valve Performance - No Third or
Fourth Gear 4.23 DTC P0757 – 2-3 Shift
Solenoid Valve Performance – No
Third or Fourth Gear
P0787 A 3-2 Shift Solenoid (SS) Control Circuit Low Voltage 4.24 DTC P0787 – 3-2 Shift
Solenoid Control Circuit Low Voltage
P0788 A 3-2 Shift Solenoid (SS) Control Circuit High Voltage 4.25 DTC P0788 – 3-2 Shift
Solenoid Control Circuit High Voltage
P0894 B Transmission Component Slipping 4.26 DTC P0894 – Transmission
Component Slipping
P0961 C Line Pressure Control (PC) Solenoid System Performance 4.27 DTC P0961 – Line Pressure
Control Solenoid System Performance
P0973 B 1-2 Shift Solenoid (SS) Control Circuit Low Voltage 4.28 DTC P0973 – 1-2 Shift
Solenoid Control Circuit Low Voltage
P0974 B 1-2 Shift Solenoid (SS) Control Circuit High Voltage 4.29 DTC P0974 – 1-2 Shift
Solenoid Control Circuit High Voltage
P0976 A 2-3 Shift Solenoid (SS) Control Circuit Low Voltage 4.30 DTC P0976 – 2-3 Shift
Solenoid Control Circuit Low Voltage
P0977 A 2-3 Shift Solenoid (SS) Control Circuit High Voltage 4.31 DTC P0977 – 2-3 Shift
Solenoid Control Circuit High Voltage
P1621 A Transmission Control Module (TCM) Long Term Memory
Performance 4.12 DTC P0601 to P0604 or
P1621 – TCM Malfunction
P1810 B Transmission Fluid Pressure (TFP) Position Switch Circuit 4.32 DTC P1810, P1815 and
P1816 – Transmission Fluid Pressure
Position Switch
P1815 B Transmission Fluid Pressure (TFP) Valve Position Switch -
Start in W rong Range 4.32 DTC P1810, P1815 and
P1816 – Transmission Fluid Pressure
Position Switch

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–43
Step Action Yes No
5 Perform the following procedure to verify the repair:
1 On Tech 2 select: Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs.
2 Follow the instructions on Tech 2 and clear any DTCs.
3 Start the engine.
4 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Have any of the DTCs in this procedure set? Go to Step 2 Go to Step 6
6 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Does Tech 2 display any DTCs you have not diagnosed? Refer to
4.8 Diagnostic Trouble Code List System OK
When all diagnosis and repairs are completed, check the
system for correct operation.
4.13 DTC P0711 to P0713 – Transmission
Fluid Temperature Sensor
DTC Description
This diagnostic procedure supports the following DTCs:
• DTC P0711 – Transmission Fluid Temperature (TFT) Sensor Performance,
• DTC P0712 – Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage, and
• DTC P0713 – Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage.
Circuit Description
The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission fluid pressure (TFP)
manual valve position switch. The automatic TFT sensor is a negative coefficient thermistor. The transmission control
module (TCM) supplies a 5 volt reference signal to the sensor and measures the voltage drop in the circuit. W hen the
transmission fluid is cold, the sensor resistance is high and the TCM detects high signal voltage. As the fluid temperature
increases, the resistance of the sensor decreases, which lowers the signal voltage. This diagnostic monitors the TFT
circuit. The circuit may be functional, but not in the normal operating range. This diagnostic indicates stuck, erratic,
intermittent, skewed, or inaccurate values, indicating poor system performance. The TFT range is -40 – 151°C.
Refer to 2 W iring Diagrams and Connector Chart to aid in diagnosis.
Conditions for Running the DTC
DTC P0711
• No DTC P0117, P0118, P0722 or P0723.
• DTC P0711 has not passed in the current ignition cycle.
• The engine run time is greater than 5 seconds.
• The transmission fluid temperature is -39 – 149°C.
• For conditions 1 and 2 in Conditions for Setting the DTC, the engine coolant temperature is greater than 70°C and
has changed by at least 50°C since start-up.
• For conditions 1 and 2 in Conditions for Setting the DTC, the TCC slip speed is 120 r.p.m. or greater for
600 seconds (10 minutes) cumulatively.
DTC P0712
The engine run time is greater than 5 seconds.

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–45
Diagnostic Aids
• Tech 2 displays the transmission fluid temperature in degrees. After the transmission is operating, the fluid
temperature should rise steadily to a normal operating temperature, then stabilise.
• Verify the customer's driving habits, trailer towing, etc. Trailer towing should occur in D3.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
3 Checks the hardware components that affect the transmission fluid temperature.
4 Checks there is power supplied to the TFT sensor.
5 Checks the TFT sensor high reference circuit for serviceability.
6 Check the TFT sensor for serviceability.
7 Checks the TFT sensor low reference circuit for serviceability.
DTC P0711 to P0713 Diagnostic Table
Step Action Yes No
1 Has the Diagnostic System Check been performed?
Go to Step 2 Refer to
4.7 Diagnostic System Check
2 1 Connect Tech 2 to the DLC.
2 Turn on the ignition, with the engine off.
NOTE
Before clearing the DTC, use the Tech 2 Freeze
Frame/Failure Record to record the transmission
parameters at the time the DTC set. Using Tech 2 to clear
the DTC(s) erases the Freeze Frame/Failure Record
records from the TCM.
3 On Tech 2 select: Transmission / Automatic Transmission / Diagnostic
Trouble Codes / Freeze Frame.
4 Select the relevant DTC and note the parameters at the time of the DTC setting.
5 On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs.
6 Follow the instructions on Tech 2 and clear the DTCs.
7 On Tech 2 select: Data Display / Transmission Data
8 Drive the vehicle and observe Tech 2 for either of the following conditions:
• The Trans. Fluid Temp . does not change more than
2.25°C in 409 seconds since start-up
• The Trans. Fluid Temp . changes more than 20°C in
200 milliseconds 14 times within 7 seconds
• The Trans. Fluid Temp . less than -39°C?
Does Tech 2 display any of the above conditions? Go to Step 4 Go to Step 3

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–46
Step Action Yes No
3 Inspect the transmission and related components for the following:
• transmission fluid level,
• transmission fluid cooling system restrictions / blockages,
• debris in the transmission fluid,
• incorrect line pressure,
• torque converter stator operation, and
• transmission overload.
W as a fault found and rectified? Go to Step 10 Check for an
intermittent fault in
the circuit, refer to
8A Electrical-Body and Chassis
4 1 Switch off the ignition.
2 Disconnect connector E-95 from the transmission.
3 Using a multimeter set to measure voltage, probe between harness connector E-95 pin 16 and a known ground.
Does the multimeter display 4.8 – 5.2 V? Go to Step 6 Go to Step 5
5 Test the TFT sensor signal circuit (between connectors E-95 pin 16
and C-96 pin 35) for a high resistance, open circuit, short to ground or
short to voltage fault condition.
Did you find and correct the condition? Go to Step 10 Go to Step 9
6 1 Switch off the ignition.
2 Remove the TCM fuses C-8 and EB-4, refer to 8A Electrical- Body and Chassis.
3 Using a multimeter set to measure resistance, probe between connector E95 pin 15 and a known ground.
Does the multimeter display less than 5 Ω? Go to Step 8 Go to Step 7
7 Using a multimeter, test between E-95 pin 15 and C-96 pin 30 for high
resistance, open circuit, short to ground or short to voltage fault
condition.
W as any fault found and rectified? Go to Step 10 —
8 Replace the TFT sensor, refer to 7C4 Automatic Transmission –
4L60E – On-vehicle Servicing.
NOTE
Check for damaged wiring (short to ground, short to
voltage, high resistance or open circuit) or poor
connections inside the transmission assembly before
replacing the TFT sensor.
Was the repair complete? Go to Step 10 —
9 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing
Was the repair completed? Go to Step 10
—

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