Isuzu KB P190. Manual - part 1004

7A2-50  TRANSMISSION CONTROL SYSTEM (AW30–40LE) 

 

Action Taken When The DTC Sets 

•  Control at A/T oil temperature 80

°C (176°F). 

•  No squat control. 

•  No slope control. 

•  No 3rd start mode. 

•  No line pressure reduction at gear change. 

•  No coast control. 

•  No line pressure reduction control at garage. 

•  No shift solenoid functional failure detection. 

•  No L-up solenoid functional failure detection. 

•  Check Trans “ON”. 

• DTC 

stored. 

•  MIL request “ON”. (EURO 4 only) 

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. 

•  Check oil temperature sensor for proper mounting 

and adjustment. 

 

Circuit/System Testing DTC P0712 

 

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 

Perform the transmission fluid checking procedure. 
Refer to checking Transmission Fluid level and 
Condition in Automatic Transmission 7A section. 

 

Was the fluid checking procedure performed? 

— Go 

to 

Step 3 

Refer to 

Checking 

Transmission 

Fluid level and 

Condition in 

Automatic 

Transmission 

(AW30-40LE) 

section 

3 

 1. Lift the driving wheels. 

 2. Start the engine and place the select lever in D 

position. 

 3. Wait for 5 minutes. 

 

Does a scan tool indicate DTC P0712? 

— Go 

to 

Step 4 

Refer to 

Diagnostic Aids

TRANSMISSION CONTROL SYSTEM (AW30–40LE)  7A2-51 

 

Step Action  Value(s) 

YES 

NO 

4 

Measure the voltage of the transmission fluid 
temperature sensor by the 5-8840-0285-0 DMM. 

 1. Turn “OFF” the ignition. 

 2. Disconnect the oil temperature sensor connector. 

 3. Turn “ON” the ignition., with the engine “OFF”. 

 4. Connect the 5-8840-0285-0 DMM to the each 

terminal of the oil temperature sensor harness 
connector E83-2 and E83-1. 

 

Does DMM indicate specified value? 

About 5V 

Go to Step 5 

Go to Step 6 

5 

Replace the oil temperature sensor. 

 

Is the replacement complete? 

— Go 

to 

Step 8 — 

6 

Measure the resistance of the wire by the 5-8840-
0285-0 DMM. 

 1. Turn “OFF” the ignition. 

 2. Disconnect the TCM connector. 

 3. Install a jumper wire from terminal E83-1 and E83-

2 on the mission harness. 

 4. Connect the 5-8840-0285-0 DMM to the each 

terminal of the TCM connector C94-11 and C94-
12. 

If a problem is found, repair as necessary. 

 

Was the problem found? 

Less than 

1

Ω 

Go to Step 8 Go 

to 

Step 7 

7 

Replace the TCM. 

Important: 

The replacement TCM must be 

programmed. 
(Refer to SPS for procedure.) 

 

Is the action complete? 

— Go 

to 

Step 8 — 

8 

 

1. Reconnect all previously disconnected harness 

connector(s). 

 2. Clear the DTCs with a scan tool. 

 3. Turn “OFF” the ignition. 

 4. Start the engine. 

 

5. Operate the vehicle within the Conditions For 

Running the DTC. You may also operate the 
vehicle within the conditions that you observed 
from the Freeze Frame/ Failure Records. 

 

Did the DTC fail this ignition? 

— Go 

to 

Step 2 Go 

to 

Step 9 

9 

Observe the stored information, Capture Info with a 
scan tool. 

 

Are there any DTCs that you have not diagnosed? 

— Go 

to 

Diagnostic 

Trouble Code 

(DTC) List 

Verify repair 

 

7A2-52  TRANSMISSION CONTROL SYSTEM (AW30–40LE) 

 

DTC P0713 (Flash Code 16) 

 

 

 

 

 

RTW77AMF000501 

 

Circuit Description 

The oil temperature sensor is a thermistor sensor that is
installed in the transmission case and converts
temperature changes into continuous electric signals,
then outputs them to the Transmission Control Module
(TCM). When the ATF temperature is low, the
resistance of the sensor (thermistor) goes up, so that
the voltage of the TCM signal becomes high. 

As the ATF is gradually warmed, the resistance of the
sensor goes down and the voltage becomes low. At the 
normal operating ATF temperature (80

°C/176°F) of the 

transmission, the voltage of the TCM is about 3.7V. 

Condition For Running The DTC 

All of the following conditions are met. 

 (1) Detect the state which the all of the following

conditions are met since ignition “ON”

for 

accumulated 15 minutes or more. 

•  Except P or N position. 

•  Selector position switch is not detecting failure

or not deciding failure. 

•  Output revolution is more than 600rpm. 

 

•  Output revolution sensor is not detecting failure 

or not deciding failure. 

  (2) Engine coolant temperature ≧ 50

°C (122°F) 

  (3) Engine coolant temperature signal is not detecting 

failure or not deciding failure. 

Condition For Setting The DTC 

The TCM detects following condition for 12 times
continuously. 

•  Oil temperature is more than –10

°C (14°F). 

Action Taken When The DTC Sets 

•  Control at A/T oil temperature 80

°C (176°F). 

•  No squat control. 

•  No slope control. 

•  No 3rd start mode. 

•  No line pressure reduction at gear change. 

•  No coast control. 

•  No line pressure reduction control at garage. 

•  No shift solenoid functional failure detection. 

TRANSMISSION CONTROL SYSTEM (AW30–40LE)  7A2-53 

 

•  No L-up solenoid functional failure detection. 

•  Check Trans “ON”. 

• DTC 

stored. 

•  MIL request “ON”. (EURO 4 only) 

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. 

•  Check oil temperature sensor for proper mounting 

and adjustment. 

 

Circuit/System Testing DTC P0713 

 

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 

Perform the transmission fluid checking procedure. 
Refer to Checking Transmission Fluid Level and 
condition Automatic Transmission 7A section. 

 

Was the fluid checking procedure performed? 

— Go 

to 

Step 3 

Refer to 

checking 

Transmission 

Fluid Level and 

Condition 

Automatic 

Transmission 

(AW30-40LE) 

section 

3 

 1. Lift the driving wheels. 

 2. Start the engine and place the select lever in D 

position. 

 3. Wait for 15 minutes. 

 

Does a scan tool indicate DTC P0713? 

— Go 

to 

Step 4 

Refer to 

Diagnostic Aids

4 

Observe the voltage of the oil temperature sensor on 
the Tech 2 data. 

 1. Turn “OFF” the ignition. 

 2. Disconnect the oil temperature sensor connector 

E-83 

 3. Install a fused jumper wire from terminal E83-2 to 

E83-1 on the transmission harness. 

 4. Turn “ON” the ignition. 

 

Does a scan tool indicate specified value? 

About 0V 

Go to Step 5 

Go to Step 6 

5 

Replace the transmission fluid temperature sensor. 

 

If the action complete? 

— Go 

to 

Step 9 —