Isuzu KB P190. Manual - part 1003

7A2-46  TRANSMISSION CONTROL SYSTEM (AW30–40LE) 

 

 

  (2) Not emergency mode. 

  (3) 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 

DTC P0707 

All of the following conditions are met for 30 seconds or
more continuously. 

•  All of the switches are “OFF”. 

•  Output revolution is more than 30 km/h (19 mph). 

•  Output revolution sensor is not detecting failure or

not deciding failure. 

•  The engine revolution is more than 1500 rpm. 

DTC P0708 

The following condition is met at 10 seconds
continuously. 

•  2 switches or more are “ON” at the same time. 

Action Taken When The DTC Sets 

•  No 3rd start mode. 

•  No slope control. 

•  No coast control. 

•  No output revolution sensor failure detection. 

•  No input revolution sensor failure detection. 

•  Keep oil temperature sensor OPEN failure detection

accumulated timer. 

•  No T/F HI-Low SW failure detection. 

•  No shift solenoid functional failure detection. 

•  No L-up solenoid functional failure detection. 

•  No engine torque reduction at stall. 

•  Regard as D position. (DTC P0707) 

•  There is a priority in order of D, 3, 2, L, R, N, and P.

(DTC P0708) 

•  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 neutral start switch for proper mounting and 

adjustment. (Refer to section 7A4 Components (1) 
neutral start switch) 

 

 

TRANSMISSION CONTROL SYSTEM (AW30–40LE)  7A2-47 

 

Circuit/System Testing DTC P0707 or P0708 

Step Action  Value(s) 

YES 

NO 

1 

 

Was the On-Board Diagnostics (OBD) System check 
performed? 

— Go 

to 

Step 2 

Go to OBD 

System Check

2 

 1. Install a scan tool. 

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

 3. Select each lever position: D, 3, 2, L, N, R and P. 

 

Does each selected transmission position match the 
“Transmission Range” display on a scan tool? 

— Refer 

to 

Diagnostic Aids 

Go to Step 3 

 

3 

Measure the voltage shifting the select lever every 
position, between TCM connector terminals and 
ground which performed selecting to every position. 

 1. Turn “OFF” the ignition. 

 2. Disconnect the TCM connector. 

 3. Turn “ON” the ignition. 

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

connector terminal and ground. 

 

Is the displayed voltage at every position normal? 

7~16V Go 

to 

Step 8 

Go to Step 4 

4 

Measure the voltage between terminals the neutral 
start switch and ground. 

 1. Turn “OFF” the ignition. 

 2. Disconnect the inhibitor switch harness connector.

 3. Turn “ON” the ignition. 

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

terminal of the neutral start switch harness 
connector E51-3 and ground. 

If a problem was found, repair as necessary. 

 

Was the problem found? 

7~16V Go 

to 

Step 9 Go 

to 

Step 5 

5 

Measure the resistance shifting the select lever to 
every position, between terminal neutral start switch 
connector E51-3 and E51 other terminal. 

 1. Turn “OFF” the ignition. 

 2. Disconnect the neutral start switch connector. 

3. Connect the DMM to the each terminal of the 

neutral start switch connector E51-3 and E51-5 
or E51-2 or E51-6, E51-8or E51-7or E51-9 or 
E51-10. 

If a problem was found repair as necessary. 

 

Was the problem found? 

Less than 

1

Ω 

Go to Step 6 Go 

to 

Step 7 

6 

Replace the neutral start switch. 

 

Is the action complete? 

— Go 

to 

Step 9 — 

7A2-48  TRANSMISSION CONTROL SYSTEM (AW30–40LE) 

 

Step Action  Value(s) 

YES 

NO 

7 

Measure he resistance between terminal neutral start 
switch harness connector E51 and TCM harness 
connector C-95. 

 1. Turn “OFF” the ignition. 

 

2. 

Disconnect the neutral start switch and TCM 
connector. 

 3. Connect the jumper wire tot the neutral start switch 

harness connector E51-2, E51-5, E51-6, E51-7, 
E51-8, E51-9 and E51-10 and good ground. 

 

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

terminal of the TCM harness connector C95-1, 
C95-20, C95-8, C95-9, C95-7, C95-19 or C95-18. 

If the problem was found repair as necessary. 

 

Was the problem found? 

Less than  

1 

Ω

 

Go to Step 9 Go 

to 

Step 8 

8 

Replace the TCM. 

Important: The replacement TCM must be 
programmed. (Refer to SPS for procedure.) 

 

Is the action complete? 

— Go 

to 

Step 9 — 

9 

 

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 10

10 

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 

 

TRANSMISSION CONTROL SYSTEM (AW30–40LE)  7A2-49 

 

DTC P0712 (Flash Code 15) 

 

 

 

 

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 

 (1) All of the following conditions are met for 2

seconds or more continuously. 

•  The supply voltage is more than 10.2 volts and

less than 15.5 volts. 

• DTC U2104 is not detecting failure or 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 550rpm. 

  (2) Not Emergency mode 

  (3) All of the following conditions are met. 

•  Device Control is not operating. 

• Disable Normal Communication is receiving 

enable. 

•  DTC Clear is not operating. 

Condition for setting the DTC 

•  The TCM detects following condition for 5 minutes

continuously. 

•  Oil temperature is less than 220

°C (428°F).