Isuzu KB P190. Manual — part 1001

7A2-38 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

TCM Diagnostic Trouble Codes

The following table lists the diagnostic trouble codes supported by this vehicle application. If any DTCs not listed here
are displayed by a scan tool, the scan tool data may be faulty; notify the scan tool manufacture of any DTCs displayed
that are not included in the following table.

DTC Type

DTC No.

Flash

Code

DTC NAME

EURO 4

Except

EURO 4

P0562

72

System Voltage Error (Low)

E

E

P0563

73

System Voltage Error (High)

E

E

P0602

63

Transmission Control Module (TCM) Programming Error

E

E

P0707

17

Transmission Range Sensor Circuit Open

B

D

P0708

17

Transmission Range Sensor Circuit Short

B

D

P0712

15

Transmission Oil Temperature Circuit Short

B

D

P0713

16

Transmission Oil Temperature Circuit Open

B

D

P0717

14

Input Speed Sensor Signal Error

B

D

P0722

11

Output Speed Sensor Signal Error

B

D

P0741

43

Torque Converter Clutch Stuck “OFF”

B

F

P0742

53

Torque Converter Clutch Stuck “ON”

B

F

P0746

45

Pressure Control Solenoid F/B Stuck

B

D

P0751

41

Shift Solenoid S1 Stuck “OFF”

B D

P0752

51

Shift Solenoid S1 Stuck “ON”

B F

P0756

42

Shift Solenoid S2 Stuck “OFF”

B F

P0757

52

Shift Solenoid S2 Stuck “ON”

B F

P0962

35

Pressure Control Solenoid Circuit Open or GND Short

B F

P0963

35

Pressure Control Solenoid Circuit Ignition Short

B D

P0973

31

Shift Solenoid S1 Circuit GND Short

B D

P0974

31

Shift Solenoid S1 Circuit Open or Ignition Short

B D

P0976

32

Shift Solenoid S2 Circuit GND Short

B D

P0977

32

Shift Solenoid S2 Circuit Open or Ignition Short

B D

P1790

61

Transmission Control Module (TCM) ROM Checksum Error

B D

P1791

62

Transmission Control Module (TCM) RAM Error

B D

P2769

33

Torque Converter Clutch Circuit GND Short

B D

P2770

33

Torque Converter Clutch Circuit Open or Ignition Short

B D

P2773

75

Transfer 4L Switch Circuit GND Short

B D

P2774

75

Transfer 4L Switch Circuit Open or Ignition Short

B D

U2104

65

CAN BUS OFF

A

C

U2105

67

Lost of Communication with ECM

A

C

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-39

Diagnostic Trouble Code (DTC) Type
Definitions

Emission Related DTC

Action Taken When the DTC Sets - Type A

• The Engine Control Module (ECM) illuminates the

malfunction indicator lamp (MIL) when the

diagnostic runs and fails.

• The ECM records the operating conditions at the

time the diagnostic fails. The ECM stores this

information in the Freeze Frame/ Failure Records.

Action Taken When the DTC Sets - Type B

• The ECM illuminates the MIL on the second

consecutive driving cycle when the diagnostic runs

and fails.

• The ECM records the operating conditions at the

time the diagnostic fails, the ECM stores this

information in the Failure Records. If the

diagnostic reports a failure on the second

consecutive driving cycle, the ECM records the

operating conditions at the time of failure and

stores this information in the Freeze Frame and

updates the Failure Records.

Conditions for Clearing the MIL/ DTC - Type A or
Type B

• The ECM turns OFF the MIL after 3 consecutive

driving cycles when the diagnostic runs and does

not fail. (Euro 4 Specification)

• The ECM turns OFF the MIL after 1 driving cycle

when the diagnostic runs and does not fail.

(Except Euro 4 Specification)

• A current DTC clears when the diagnostic runs

and passes after 1 driving cycle.

• A history DTC clears after 40 consecutive warm-

up cycles, if no failures are reported.

• Use a scan tool to clear the MIL and the DTC.

Non-Emissions Related DTCs

Action Taken When the DTC Sets - Type C or Type
D

• The TCM illuminates the Check Trans lamp when

the diagnostic runs and fails.

• The TCM records the operating conditions at the

time the diagnostic fails. The TCM stores this

information in the Failure Records.

• The TCM illuminates the Check Trans on the

second consecutive driving cycle when the

diagnostic runs and fails.

• The TCM records the operating conditions at the

time the diagnostic fails, the TCM stores this

information in the Failure Records. If the

diagnostic reports a failure on the second

consecutive driving cycle, the TCM records the

operating conditions at the time of failure and

stores this information in the Freeze Frame and

updates the Failure Records.

Conditions for Clearing the Check Trans Lamp/ DTC
- Type C or Type D

• The TCM turns OFF the Check Trans lamp after 1

driving cycle when the diagnostic runs and does

not fail.

• A current DTC clears when the diagnostic runs

and passes after 3 driving cycle.

• A history DTC clears after 40 consecutive warm-

up cycles, if no failures are reported.

• Use a scan tool to clear the Check Trans lamp and

the DTC.

Action Taken When the DTC Sets - Type E or Type F

• The TCM will not illuminate the Check Trans lamp.
• The TCM records the operating conditions at the

time the diagnostic fails. The TCM stores this

information in the Failure Records.

Conditions for Clearing the DTC - Type E or Type F

• A current DTC clears when the diagnostic runs

and passes after 1 driving cycle.

• A history DTC clears after 40 consecutive warm-

up cycles, if no failures are reported.

• Use a scan tool to clear the DTC.

7A2-40 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

DTC P0562 or P0563 (Flash Code 72 or 73)

RTW77ALF001301

Circuit Description

The Transmission Control Module (TCM) monitors the
system voltage on the ignition feed terminal to the TCM.
A system voltage DTC will set whenever the voltage is
below or above a calibrated value.

Condition For Running The DTC

Ignition "ON" and either (1) or (2) conditions are met.

(1) All of the following conditions are met.

• DTC U2104 is not detecting failure of not

deciding failure.

• DTC U2105 is not detecting failure or not

deciding failure.

• Engine revolution signal is not detecting failure

or not deciding failure.

• The engine revolution is more than 1000rpm.

• All of the following conditions are met.

- Device Control is not operating

- Disable Normal Communication is receiving

enable

- DTC Clear is not operating

(2) All of the following conditions are met.

• Input revolution sensor is not detecting failure or

not deciding failure.

• Input revolution is more than 1000rpm.

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-41

• All of the following conditions are met.

- Device Control is not operating

- Disable Normal Communication Service is

receiving enable

- DTC Clear is not operating

Condition For Setting The DTC

When the TCM detects following conditions at 20 times
continuously.

• Ignition voltage is less than 9 volts for 1 second or

more continuously. (DTC P0562)

• Ignition voltage is more than 18 volts for 1 second or

more continuously. (DTC P0563)

Action Taken When The DTC Sets

• DTC stored.

Conditions For Clearing The DTC

• The DTC can be cleared from the TCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warm-up cycles without a
failure reported.

• After more than 1 second has elapsed after the

ignition key has been turned “ON”, short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.

Diagnostic Aids

• Inspect the wiring for poor electrical connection at the

TCM. Look for possible bent, backed out, deformed
or damaged terminals. Check for weak terminal
tension as well. Also check for a chafed wire that
could short to bare metal or other wiring.

Inspect for a broken wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while
observing test equipment for a change.

Circuit/System Testing DTC P0562 or P0563

Step Action Value(s)

YES

NO

1

Was the On-Board Diagnostic (OBD) System Check
performed?

—

Go to Step 2 Go

to

OBD

System Check

2

Using the 5-8840-0285-0 DMM, measure the battery
voltage at the battery.

Is the battery voltage greater than the specified value?

11.5 V

Go to Step 3

Charge battery,

then go to

Step 3

3

1. Install a scan tool.

2. Select “Ignition Volts” on a scan tool.

3. Start the engine and raise the engine speed to the

specified value.

4.

Load the electrical system by turning on the
headlights, high blower, etc.

Is the ignition voltage approximately equal to the
specified value?

More than

1000 rpm

9.0-18.0 V

Go to Step 4

Go to

Starting/

Charging