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Isuzu KB P190. Manual - part 956

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–38

Step Action

Yes

Using a multimeter set to measure voltage, probe between
connector C-96 pin 31 and a known ground.

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

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:

On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs.

Follow the instructions on Tech 2 and clear any DTCs.

Operate the vehicle under the following conditions:

Start the engine.

Allow the engine to warm up to normal operating
temperature.

Raise the engine speed to at least 1,200 r.p.m.

TCM voltage must be greater than 11 V for 12 seconds.

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.

When the TCM detects high voltage, DTC P0563 sets. DTC P0563 is a type C DTC.

Refer to 2

Wiring Diagrams and Connector Chart to aid in diagnosis.

Conditions for Running the DTC

The ignition is on.

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:

The alternator warning indicator will illuminate if there is a problem with the charging system of the vehicle.

Checks the charging system voltage with a minimal load.

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

Has the Diagnostic System Check been performed?

Go to Step 2

Refer to

4.7 Diagnostic

System Check

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–40

Step Action

Yes

Connect Tech 2 to the DLC.

Turn on the ignition, with the engine off.

N O T E

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.

On Tech 2 select:
Transmission / Automatic Transmission / Diagnostic
Trouble Codes / Freeze Frame.

Select the relevant DTC and note the parameters at the time of
the DTC setting.

On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs.

Follow the instructions on Tech 2 and clear the DTCs.

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

Start the engine.

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

Turn off all electrical accessories.

Increase the engine speed to 2,000 r.p.m.

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

Leave the engine running.

On Tech 2 select:
Data Display / Transmission Data
and observe the Ignition Voltage on Tech 2.

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

Did DTC P0563 reset?

Go to Step 7

Check for an

intermittent fault in

the circuit, refer to

8A Electrical-Body

and Chassis

Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E –
On-vehicle Servicing.

Is the action complete?

Go to Step 8

—

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–41

Step Action

Yes

Perform the following procedure to verify the repair:

On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs

Follow the instructions on Tech 2 and clear any DTCs.

On Tech 2 select:
Data Display / Transmission Data

Operate the vehicle under the following conditions:

Start the engine.

Allow the engine to warm up to normal operating
temperature.

c Observe

the

Ignition Voltage on Tech 2.

Ignition Voltage must remain below 18 V for 12 seconds.

On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.

Has DTC P0563 set?

Go to Step 2

Go to Step 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

Wiring 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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