Isuzu KB P190. Manual - part 1079

7A2-32   TRANSMISSION CONTROL SYSTEM (JR405E)

8

Important: Replacement TCM must be
programmed.
Replace the TCM. Refer to TCM Replacement.

Did you complete the replacement?

—

Go to Step 9

—

9

1.

Turn OFF the ignition.

2.

Reconnect all previously disconnected fuse or
harness connector(s).

3.

Turn ON the ignition, with the engine OFF.

4.

Attempt to establish communication with the
TCM.

Does the scan tool communicate with the TCM?

—

System OK

Go to Step 3

Step

Action

Action

Yes

No

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-33

DTC P0560 (Flash Code 16)

Circuit Description

The TCM monitors the ignition voltage on the ignition
feed terminal to make sure that the voltage stays within
the proper range. If the TCM detects an excessively
low ignition voltage, this DTC will set.

Condition for Running the DTC

• The ignition switch is ON. 

• The engine speed is more than 1000 RPM.

Condition for Setting the DTC

• The TCM detects that the ignition voltage feed

circuit is less than 10 volts for 1 second. 

Action Taken When the DTC Sets

• The TCM blinks the Check Trans lamp when the

diagnostic runs and fails.

During the vehicle running;

• The TCM holds the last gear position when the

diagnostic runs and fails. 

• The TCM inhibits lock up control.

After the vehicle stopped;

• The TCM stops all shift solenoid valves and fixes

to the 3rd gear. If a fail-safe valve problem is
detected, the shift solenoid valves are not stopped
but gear is fixed to the 3rd gear. 

• The TCM stops PC solenoid valve.

Condition for Clearing the DTC

• The TCM turns OFF the Check Trans lamp when

the diagnostic runs and does not fail.

• A current DTC clears when the diagnostic runs and

does not fail. 

Diagnostic Aids

• A charging system problem may set this DTC.

• The weakened battery may set this DTC.

Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views

Circuit/ System Testing DTC P0560

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check -
Transmission Controls?

—

Go to Step 2

Go to Diagnostic 

System Check -

Transmission 

Controls

2

1.

Install a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Start the engine and let idle.

4.

Load the electrical system by turning ON the
headlights, A/C, etc. while observing the DTC
Information with a scan tool.

Does the DTC fail this ignition? 

—

Go to Step 3

Go to Diagnostic 

Aids

3

Test the charging system. Refer to Diagnosis of
The Charging System in the Charging System
Section.

Did you find a charging system problem?

—

Go to Step 4 

Go to Step 5

4

Repair the charging system. Refer to Diagnosis of
The Charging System in the Charging System
Section.

Did you complete the repair?

—

Go to Step 6

—

5

1.

Turn OFF the ignition.

2.

Disconnect the TCM harness connector.

3.

Inspect for an intermittent, for poor
connections and for corrosion at the harness
connector of the TCM (pins 5, 18 and 24 of C-
95).

4.

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 6

Go to Diagnostic 

Aids

7A2-34   TRANSMISSION CONTROL SYSTEM (JR405E)

6

1.

Reconnect all previously disconnected
harness connector(s).

2.

Clear the DTCs with a scan tool.

3.

Turn OFF the ignition for 30 seconds.

4.

Start the engine and let idle.

5.

Load the electrical system by turning ON the
headlights, A/C, etc. while observing the DTC
Information with a scan tool.

Did the DTC fail this ignition?

—

Go to Step 3 

Go to Step 7

7

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

No

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-35

DTC P0602

Description

The TCM has the ability to set a diagnostic trouble
code (DTC) if it detects that there is no vehicle
identification number (VIN) stored. In order for the
software to be locked, the mechanization counter used
at time of production must be set to zero. If the counter
is anything other than zero AND there is no VIN stored,
this DTC will set.

Condition for Setting the DTC

• VIN in TCM is not programmed (blank) and TCM is

unlocked.

Action Taken When the DTC Sets

• The TCM does not blink the Check Trans lamp.

Notice:

• Clear the DTC with a scan tool after programming

the VIN.

Circuit/ System Testing DTC P0602

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check -
Transmission Controls?

—

Go to Step 2

Go to Diagnostic 

System Check -

Transmission 

Controls

2

1.

Install a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition, with the engine OFF.

4.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition? 

—

Go to Step 3

Go to Step 5

3

1.

Verify the correct VIN is entered into the TCM
with a scan tool. Refer to TCM Replacement.
If the VIN is correctly entered, clear the DTC
with a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition, with the engine OFF.

Does the DTC fail this ignition?

—

Go to Step 4 

Go to Step 5

4

Important: Replacement TCM must be
programmed.
Replace the TCM. Refer to TCM Replacement.

Did you complete the replacement?

—

Go to Step 5

—

5

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK