2007 ISUZU KB P190 Workshop Repair Manual

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Page 3809 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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

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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Page 3810 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–24
Shift Solenoid B •
The TCM commands the 2-3 shift solenoid valve on and off. Tech 2’s Shift Solenoid B
parameter should

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–24
Shift Solenoid B •
The TCM commands the 2-3 shift solenoid valve on and off. Tech 2’s Shift Solenoid B
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, third 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.
3-2 Downshift Solenoid
• The TCM commands the 3-2 shift solenoid valve on and off. Tech 2’s 3-2 Downshift
Sol. parameter should match the commanded state.
• When the ignition is on, and the engine is off, there are 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:
• The transmission range (PRNDL) must be Park or Neutral. If the transmission
range is not in Park or Neutral, the message : Engine running and
transmission range is not Park/Neutral 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.
Clear TAPS
(Transmission Adaptive
Pressures) • The TCM clears (or resets) the TAP cells to the original base value.
• There are no limits to using this test. It may be performed with the engine running or
when the ignition is on, and the engine is off.

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Page 3811 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–25
PC Solenoid
• The TCM commands the current to the pressure control solenoid to control
transmission line pressure. As the

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–25
PC Solenoid
• The TCM commands the current to the pressure control solenoid to control
transmission line pressure. As the current increases, the line pressure decreases. As
the current decreases, the line pressure increases. The current range is 0.00 – 1.10 A
and may be commanded in one-tenth of an amp increments.
• When the ignition is on, and the engine is off, the reference (commanded) amperage
may be controlled within calibrated limits. Tech 2’s parameter PCS Desired Current
changes by the parameter PCS Actual Current does not change. The reference
current remains until commanded otherwise.
• W hen the engine is running, the following control limits apply:
• W hen the transmission range is Park or Neutral, the reference (commanded)
current may be controlled within calibrated limits. The engine speed must be
less than 1,500 r.p.m. If the engine speed is great than 1,500 r.p.m, the
message TR in park/neutral and engine speed over 1,500 RPM appears on
Tech 2. Both Tech 2 parameters PCS Desired Current and PCS Actual Current
parameters change. Both current readings remain until commanded otherwise.
• W hen the transmission range is not in Park or Neutral, the reference current can
only be controlled less than the current determined by the TCM. The TCM does
not allow a value to be selected that may cause damage to the transmission. If
the requested amperage is more than allowed by the TCM, the message
Requested current for the PC Solenoid is too high appears on Tech 2.
• Transmission range DTCs must not be active. If a transmission range DTC is
active, the message Engine running with transmission DTC present appears
on Tech 2.
Gear Control
• The TCM commands upshifts and downshifts. 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 are no limits to this control. The
Tech 2 shift solenoid states changes to match the Commanded Gear selected.
• W hen the engine is running, the following control limits apply:
• The TCM does not allow a shift if it causes the engine r.p.m. to exceed a
calibrated limit. If a gear is requested and the engine speed is too high, the
message Engine speed too high appears on Tech 2.
• The TCM does not allow a 3-2 or 2-1 downshift if the vehicle speed exceeds a
calibrated limit. If either downshift is requested and the vehicle speed is too high,
the message Eng. is on and veh. Speed too hi for 3-2 or 2-1 downshift
appears on Tech 2.
• The TCM does not allow a 4-3 downshift if this vehicle speed exceeds a
calibrated limit. If a 4-3 downshift is requested and the vehicle speed is too high,
the message Vehicle speed to high appears on Tech 2.
• The TCM does not allow an upshift if the vehicle speed exceeds a calibrated
limit. If an upshift is requested and the vehicle speed is too high, the message
Vehicle speed to high appears on Tech 2.
• The TCM does not allow an upshift that is greater than the current selected
transmission range (PRNDL). For example 3
rd gear is not allowed if the
transmission range is D2. If an upshift is requested that 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.

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Page 3812 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–26
TCC Control Solenoid
• The TCM commands the duty cycle of the TCC PWM solenoid. The duty cycle is
represented by a percen

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–26
TCC Control Solenoid
• The TCM commands the duty cycle of the TCC PWM solenoid. The duty cycle is
represented by a percentage of on (energised) time. Approximately 90-100 percent
duty cycle represents an on (energised) commanded state. Zero percent represents
an off (non-energised) commanded state. Tech 2 TCC PW M Solenoid parameter
should match the commanded state.
• When the ignition is on, and the engine is off, there are no limits to this control. The
solenoid remains on (90-100 percent duty cycle) until commanded off (zero percent
duty cycle), and vice versa. When the test is exited, the solenoid duty cycle is
determined by the TCM.
• W hen the engine is running, the following control limits apply:
• If the transmission range is Park, and the transmission is in hot mode, the TCC
control solenoid may not be commanded off. If the solenoid is requested off, the
message TCC OFF command disabled in Hot Mode appears on Tech 2.
• The TCC control solenoid may not be commanded off for more than a calibrated
amount of time. If the solenoid is commanded off for a certain amount of time,
the message TCC OFF time has been exceeded appears on Tech 2.
TCC Apply
•
The TCM commands the TCC enable solenoid valve on and off. Tech 2’s TCC
Solenoid parameter should match the commended state.
• When the ignition is on, and the engine is off, there are 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:
• If the transmission range is Park or Neutral, the TCC enable solenoid may not
be commanded off for more than a calibrated amount of time. If the solenoid is
commanded off for a certain amount of time, the message TCC OFF time has
been exceeded appears on Tech 2.
• If the transmission range is Park or Neutral and the TCC control solenoid duty
cycle is less than maximum capacity, the TCC solenoid may not be commanded
on. If the solenoid is requested on during these conditions, the message TCC
Control Solenoid is not set to maximum Pressure appears on Tech 2.
• If the TCC control solenoid duty cycle is less than maximum capacity, the TCC
solenoid may not be commanded on. If the solenoid is commanded on during
these conditions the message TCC Control Solenoid is not set to maximum
Pressure appears on Tech 2.
• If the transmission is in hot mode, the TCC solenoid may not be commanded off.
If the solenoid is requested off the message TCC OFF command disabled in
Hot Mode appears on the scan tool display.

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Page 3813 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–27
4 Diagnostics
4.1 Introduction
The transmission diagnostic procedure is organised in a logical structure that begins with th

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–27
4 Diagnostics
4.1 Introduction
The transmission diagnostic procedure is organised in a logical structure that begins with the diagnostic system check
and as such must always be used as the starting point. The diagnostic system check directs the technician to the logical
steps necessary to diagnose a transmission driveability fault condition.
4.2 Basic Knowledge Required

A lack of basic understanding regarding
electronics, electrical wiring circuits and use
of electrical circuit testing tools when
performing any diagnostic procedure, could
result in incorrect diagnostic results or
damage to system components.
Understanding of the following is required to perform any of the diagnostic procedures detailed in this Service
Information:
• Basic electronics,
• Electrical wiring circuits,
• Electrical circuits testing, and
• Correct use of basic system diagnostic tools.
4.3 Diagnostic Precautions

When tests are required on connector
terminals, use the adapters in connector
adaptor kit J35616-C to prevent damage to
terminals.
The following precautions must be observed when performing all diagnostic procedures. Otherwise, incorrect diagnostic
results or damage to system components will occur:
1 Disconnection of the battery affects certain vehicle electronic systems.
2 Disconnect the battery negative lead when performing the following procedures:
• Disconnecting the electronic control module wiring harness connector/s or
• Charging the battery.
3 Disconnect the battery terminal ground lead and the electronic control module wiring harness connector before attempting any electric arc welding on the vehicle.
4 Do not start the engine if the battery terminal is not properly secured to the battery.
5 Do not disconnect or reconnect any of the following while the ignition is switched on or when the engine is running:
• Any electronic control module or system component electrical wiring connector, or
• Battery terminal leads.
6 Ensure that the correct procedure for disconnecting and connecting system electrical wiring harness connectors is always followed. For information on the correct procedure for disconnecting and connecting specific wiring
connectors, refer to 8A Electrical-Body and Chassis.

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Page 3814 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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 co

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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Page 3815 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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 d

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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Page 3816 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–30
• records the operating condition at the time the diagnostic fails and stores this information in the Freeze Frame/
Failur

Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–30
• records the operating condition at the time the diagnostic fails and stores this information in the Freeze Frame/
Failure Record.
Type B – Emission Related DTCs
The TCM takes the following actions when a Type B DTC runs and fails.
• On the first time a Type B DTC fails:
• sets a current Type B DTC that represents the fault condition, and
• records the operating conditions at the time the fault sets and stores this information in the Failure Records.
• On the second consecutive ignition cycle that a Type B DTC fails:
• illuminates the MIL, and
• records the operating condition at the time the diagnostic fails and stores this information in the Freeze
Frame/ Failure Record.
Conditions for Clearing Type A or Type B DTCs
• The current DTC clears when there is no fault condition in the current TCM self-diagnostics.
• If there are no DTCs logged after six consecutive ignition cycles, the TCM deactivates the MIL.
• Type A or Type B History DTC clears when there is no fault condition after 40 consecutive warm-up cycles.
• Use of Tech 2 to clear DTCs.
Type C – Non-emission Related DTCs
The TCM takes the following action when a Type C DTC runs and fails:
• sets a current Type C DTC that represents the fault condition,
• records the operating conditions at the time the DTC is logged and stores this information in the Failure Record,
and
NOTE
The MIL does not illuminate when a Type C DTC
sets.
Conditions for Clearing Type C DTCs
• The current DTC clears when there is no fault condition in the current TCM self-diagnostics.
• Type C History DTC clears when there is no fault condition after 40 consecutive warm-up cycles.
• Use of Tech 2 to clear DTCs.
Current DTCs
A DTC is a Current DTC if the fault condition that triggers the DTC is present during the last TCM self-diagnostics.
History DTCs
A DTC is a History DTC if the fault condition that triggers the DTC is not present during the last TCM self-diagnostics.
4.7 Diagnostic System Check
Description
This section procedure is organised in a logical structure that begins with the diagnostic system check. The diagnostic
system check directs you in a logical direction to the appropriate Section or diagnostic procedure.

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