check engine 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 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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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–34
• The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM stores this
information as Failure Records.
• The TCM stores DTC P0218 in TCM history.
Conditions for Clearing the DTC
• Tech 2 can clear the DTC.
• The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission
related diagnostic fault occurring.
• The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes.
Diagnostic Aids
• Tech 2’s Transmission Fluid Temp. should rise steadily to a normal operating temperature, then stabilise.
• Ask about the customer's driving habits, trailer towing, etc. Trailer towing should occur in D3.
• Refer to Symptoms - Automatic Transmission in 7C3 Automatic Transmission – 4L60E – Hydraulic and Mechanical
Diagnosis.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
2 Low transmission fluid can cause the transmission to overheat.
3 This step inspects for airflow restrictions or damage, which may result in the transmission overheating.
4-5 Decreased line pressure will cause the transmission to overheat. The torque converter stator is the pump for the transmission fluid. If the torque converter is damaged, it may not be producing the required pressure.
DTC P0218 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 Inspect for correct transmission fluid level, refer to 7C4 Automatic Transmission – 4L60E – On-vehicle Servicing.
Did you perform the fluid checking procedure? Go to Step 3 Perform the
transmission fluid
checking procedure, refer to
7C4 Automatic
Transmission –
4L60E – On-vehicle Servicing

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–35
Step Action Yes No
3 1 Inspect the engine cooling system and transmission cooling
system for the following conditions:
• Air flow restrictions
• Air flow blockage
• Debris
2 Inspect the transmission cooling system for damaged cooler lines.
3 Check the flow rate of the transmission fluid, refer to 7C4 Automatic Transmission – 4L60E – On-vehicle Servicing.
Did you find and correct the condition? Go to Step 6 Go to Step 4
4 Test for correct line pressure, refer to 7C3 Automatic Transmission –
4L60E – Hydraulic and Mechanical Diagnosis.
Did you find and correct the condition? Go to Step 6 Go to Step 5
5 Diagnose the torque converter stator, refer to 7C3 Automatic
Transmission – 4L60E – Hydraulic and Mechanical Diagnosis.
Did you find and correct the condition? Go to Step 6 Check for an
intermittent fault in the circuit, refer to
8A Electrical-Body
and Chassis
6 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 and idle the engine until it reaches normal operating temperature.
4 On Tech 2 select: Data Display / Transmission Data.
5 Drive the vehicle for 10 minutes.
6 On Tech 2, monitor the Transmission Fluid Temp. and ensure
it has stabilised and is less than 129°C.
7 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0218 set? Go to Step 2 Go to Step 7
7 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.
4.10 DTC P0562 – System Voltage Low
DTC Description
This diagnostic procedure supports DTC P0562 System Voltage Low.
Circuit Description
The transmission control module (TCM) continuously monitors the system voltage on the battery and ignition circuits.
Lower than normal voltage may be inadequate to operate the transmission control solenoids properly. Improper solenoid
operation may cause erratic transmission operation and tie-up conditions, which may result in internal damage.

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–36
When the TCM detects low voltage, DTC P0562 sets. DTC P0562 is a type C DTC.
Refer to 2 W iring Diagrams and Connector Chart to aid in diagnosis.
Conditions for Running the DTC
The engine speed is greater than 1,200 r.p.m.
Conditions for Setting the DTC
The TCM detects system voltage less than 11 V for 10 seconds.
Action Taken When the DTC Sets
• The TCM does not request the engine control module (ECM) to illuminate the MIL.
• The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM records this
information as a Failure Record.
• The TCM stores DTC P0562 in TCM history.
Conditions for Clearing the DTC
• The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission
related diagnostic fault occurring.
• Tech 2 can clear the DTC.
Diagnostic Aids
• Observe the instrument cluster’s multi-function display messaging that would indicate the electrical system requires
service.
• Inspect for the following conditions:
• Loose or damaged terminals at the generator, and
• Loose or worn generator drive belt.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
3 The alternator warning indicator will illuminate if there is a problem with the charging system of the vehicle.
4 Checks the charging system voltage with a nominal load.
5 Checks if the ignition voltage measurement reported by the TCM is within acceptable parameters.
7 Checks if there is battery voltage supplied to the TCM.
8 Checks if there is battery voltage supplied through the ignition circuit to the TCM.
9 Checks the ground circuits of the TCM.
DTC P0562 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

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–37
Step Action Yes No
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 Using a multimeter set to measure voltage, probe across the battery terminals.
Does the multimeter display greater than 11 V? Go to Step 3 Check the
serviceability of the battery, refer to
8A Electrical-Body and Chassis
3 1 Start the engine.
2 Allow the engine to warm up to normal operating temperature.
Is the alternator fail warning indicator illuminated? Refer to
6D1-1 Charging system – V6 Go to Step 4
4 1 Turn on the high beam headlamps.
2 Turn the HVAC fan control to the highest speed setting.
3 Turn on the rear window demister.
4 Increase the engine speed to 1,500 r.p.m.
5 Using a multimeter set to measure voltage, probe across the battery terminals.
Does the multimeter display 12.5 – 14.5 V? Go to Step 5 Refer to
6D1-1 Charging system – V6
5 1 Increase the engine speed to 1,500 r.p.m.
2 On Tech 2 select: Data Display / Transmission Data
Does Tech 2 display the Ignition Voltage parameter within 12.5 –
14.5 V? Check for an
intermittent fault in the circuit, refer to
8A Electrical-Body
and Chassis Go to Step 6
6
Check the fuses EB-4 and C-8 for serviceability.
Are the fuses serviceable?
Go to Step 7 Replace the
affected fuse(s). If the fuse(s) blow
again, check for a short to ground in the fuses circuit
Go to Step 13
7 1 Turn off the ignition.
2 Disconnect the TCM connector C-96.
3 Using a multimeter set to measure voltage, probe between connector C-96 pin 32 and a known ground.
Does the multimeter display battery voltage? Go to Step 8 Check measured
circuits for an open,
high resistance or short to ground
Repair or replace
the affected circuit

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–38
Step Action Yes No
8 1 Using a multimeter set to measure voltage, probe between
connector C-96 pin 31 and a known ground.
2 Turn on the ignition, with the engine off.
Does the multimeter display battery voltage? Go to Step 9 Check measured
circuits for an open, high resistance or short to ground
Repair or replace
the affected circuit
9 Using a multimeter set to measure resistance, probe between
connector C-96 pin 49 and a known ground.
Does the multimeter display continuity?
Got to Step 10 Check measured
circuit for an open or
high resistance
Repair or replace affected circuit
10 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing
Is the action complete? Go to Step 11 —
11 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 Operate the vehicle under the following conditions: a Start the engine.
b Allow the engine to warm up to normal operating temperature.
c Raise the engine speed to at least 1,200 r.p.m.
d TCM voltage must be greater than 11 V for 12 seconds.
4 On Tech 2 select: Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0562 set? Go to Step 2 Go to Step 12
12 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.
4.11 DTC P0563 – System Voltage High
DTC Description
This diagnostic procedure supports DTC P0563 System Voltage High.
Circuit Description
The transmission control module (TCM) continuously monitors the system voltage on the battery and ignition circuits.
Higher than normal voltage may cause the solenoids inside the transmission to operate improperly or damage solid-state
components inside the TCM.
W hen the TCM detects high voltage, DTC P0563 sets. DTC P0563 is a type C DTC.
Refer to 2 W iring Diagrams and Connector Chart to aid in diagnosis.
Conditions for Running the DTC
The ignition is on.

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–39
Conditions for Setting the DTC
The TCM detects system voltage greater than 18 V for 10 seconds.
Action Taken When the DTC Sets
•
The TCM does not request the engine control module (ECM) to illuminate the MIL.
• The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM records this
information as a Failure Record.
• The TCM stores DTC P0563 in TCM history.
Conditions for Clearing the DTC
•
The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission
related diagnostic fault occurring.
• Tech 2 can clear the DTC.
Diagnostic Aids
• Observe the instrument cluster’s multi-function display for messaging that would indicate the electrical system
requires service.
• Use Tech 2 to inspect all other modules for voltage related DTCs.
• Running the engine with a battery charger attached may cause DTC P0563 to set.
• Inspect the charging circuit for high resistance.
• Inspect the vehicle battery for open or sulphated cells.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
3 The alternator warning indicator will illuminate if there is a problem with the charging system of the vehicle.
4 Checks the charging system voltage with a minimal load.
5 Checks if there is a difference between the Tech 2 reading and the voltage measure in an earlier step.
DTC P0563 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

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–40
Step Action Yes No
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: Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0562 set? Refer to
4.10 DTC
P0562 – System
Voltage Low Go to Step 3
3 1 Start the engine.
2 Allow the engine to warm up to normal operating temperature.
Is the alternator fail warning indicator illuminated? Refer to
6D1-1 Charging system – V6 Go to Step 4
4 1 Turn off all electrical accessories.
2 Increase the engine speed to 2,000 r.p.m.
3 Using the multimeter set to measure voltage, probe across the battery terminals. Record the measurement for reference.
Does the multimeter display 12.5 – 14.5 V? Go to Step 5 Refer to
6D1-1 Charging system – V6
5 1 Leave the engine running.
2 On Tech 2 select: Data Display / Transmission Data
and observe the Ignition Voltage on Tech 2.
3 Increase the engine speed to 2,000 r.p.m.
Is the difference between the voltage displayed on Tech 2 and the
voltage measurement in Step 4 greater than 1.0 V? Go to Step 7 Go to Step 6
6 Did DTC P0563 reset?
Go to Step 7 Check for an
intermittent fault in the circuit, refer to
8A Electrical-Body and Chassis
7 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing.
Is the action complete? Go to Step 8 —

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–41
Step Action Yes No
8 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 On Tech 2 select: Data Display / Transmission Data
4 Operate the vehicle under the following conditions: a Start the engine.
b Allow the engine to warm up to normal operating temperature.
c Observe the Ignition Voltage on Tech 2.
d Ignition Voltage must remain below 18 V for 12 seconds.
5 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0563 set? Go to Step 2 Go to Step 9
9 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.
4.12 DTC P0601 to P0604 or P1621 – TCM
Malfunction
DTC Description
This diagnostic procedure supports the following DTCs:
• DTC P0601 Transmission Control Module (TCM) Read Only Memory (ROM),
• DTC P0602 Transmission Control Module (TCM) Not Programmed,
• DTC P0603 Transmission Control Module (TCM) Long Term Memory Reset,
• DTC P0604 Transmission Control Module (TCM) Random Access Memory (RAM), and
• DTC P1621 Transmission Control Module (TCM) Long Term Memory Performance.
Circuit Description
The internal fault detection is handled inside the transmission control module (TCM). No external circuits are involved.
These DTCs are type A DTCs.
Refer to 2 W iring Diagrams and Connector Chart to aid in diagnosis.
Conditions for Running the DTC
The TCM runs the program to detect an internal fault when the engine is running. The only requirements are voltage and
ground. This program runs even if the voltage is out of the valid operating range.
Conditions for Setting the DTC
The TCM has detected an internal malfunction.

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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–42
Action Taken When the DTC Sets
• The TCM requests the ECM to illuminate the MIL.
• The TCM allows the vehicle to operate in transmission protection mode.
• The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM stores this
information as a Failure Record.
• The ECM records the operating conditions when the conditions for setting the DTC are met. The ECM stores this
information as a Freeze Frame.
Conditions for Clearing the DTC
• The ECM turns off the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination
request.
• Tech 2 can clear the DTC.
• The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related
diagnostic fault occurring.
• The TCM cancels the DTC default actions when the ignition is off long enough to power down the TCM.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
2 DTC P0602 indicates the TCM is not programmed.
DTC P0601 to P0604 or P1621 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.
3 On Tech 2 select: Transmission / Automatic Transmission / Diagnostic
Trouble Codes / Read DTC Information.
Has DTC P0602 set? Go to Step 3 Go to Step 4
3 1 On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs
2 Follow the instructions on Tech 2 and clear any DTCs.
3 Program the TCM, refer to 7C4 Automatic Transmission – 4L60E – On-vehicle Servicing.
4 On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0602 set? Go to Step 4 Go to Step 5
4 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing.
Did you complete the replacement? Go to Step 5 —

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