Isuzu KB P190. Manual - part 1002

7A2-42  TRANSMISSION CONTROL SYSTEM (AW30–40LE) 

 

Step Action  Value(s) 

YES 

NO 

4 

 1. Turn “OFF” the ignition.  

 2. Disconnect the TCM connector at the TCM.  

 

3. 

Using the 5-8840-0285-0 DMM, measure the 
battery voltage between the TCM connector 
terminal C94 (Pin No.24) 

 

Is it approximately equal to battery voltage? 

—  

Check for 

excessive 

current with 

ignition “OFF” 

engine “OFF”. 

Go to Step 5  

5 

 1. Check for faulty connections at the TCM harness 

terminals.  

 2. Repair as necessary. 

 

Was a repair necessary? 

—  

Go to Step 8 Go 

to 

Step 6  

6 

 1. Check for an open battery feed circuit to the TCM. 

 2. Repair as necessary. 

 

Was a repair necessary? 

—  

Go to Step 8 Go 

to 

Step 7  

7 

Replace the TCM.  

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

 

Was 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 

TRANSMISSION CONTROL SYSTEM (AW30–40LE)  7A2-43 

 

DTC P0602 (Flash Code 63) 

Circuit Description 

The Service Programming System (SPS) updates the
flash calibration files that are stored in a Transmission
Control Module (TCM). The calibration file 
custom-tailors a module to a certain vehicle. The
calibration file contains data for things such as spark
curves and fuel control. When troubleshooting a
driveability problem, diagnosis may call for
reprogramming the controller with newer calibration 
information to correct a customer concern and Vehicle
Identification Number (VIN). 

Condition for setting the DTC 

When a VIN No. is not written into the TCM. 

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 

DTC P0602 is indicated when a VIN No. is not written
into the TCM.  A security lock is performed by SPS. And
not replace the TCM when DTC P0602 can repair by
SPS. 

 

 

 

 

7A2-44  TRANSMISSION CONTROL SYSTEM (AW30–40LE) 

 

Circuit/System Testing DTC P0602 

 

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 

 1. Install a scan tool. 

 2. Turn “ON” the ignition. 

 3. Check the Vehicle Identification Number (VIN) by 

the scan tool. 

 

Is VIN on the scan tool same as VIN of vehicles? 

— Go 

to 

Step 4 

Go to Step 3 

3 

Write a VIN by a scan tool. (Refer to SPS for 
procedure.) 

 

Is the action complete? 

— Go 

to 

Step 4 — 

4 

Clear the DTC P0602 with a scan tool. 

 

Is the action complete? 

—  

Go to Step 5 — 

5 

Perform the SPS and perform security lock. (Refer to 
SPS for procedure) 

 

Is the action complete? 

—  

Go to Step 6 — 

6 

Recheck the DTC with a scan tool. 

 1. Turn “OFF” the ignition. 

 2. Wait a few seconds. 

 3. Turn “ON” the ignition. 

 

Does a scan tool indicate DTC P0602? 

—  

Go to Step 7 Go 

to 

Step 8 

7 

Replace the TCM. 

Important: 

The replacement TCM must be 

programmed. (Refer to SPS for procedure.) 

 

Was 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 

 

TRANSMISSION CONTROL SYSTEM (AW30–40LE)  7A2-45 

 

DTC P0707 or P0708 (Flash Code 17) 

 

 

 

 

RTW77ALF001401 

 

Circuit Description 

The neutral start switch gives the signals related to the
selector lever position (PRND32L) to the Transmission
Control Module (TCM). The neutral start switch turns on
when the select lever is shifted to the P, R, N, D, 3, 2 or
L position. The neutral start switch, which is connected
to the starter switch circuit, is available only when the
select lever is in the P or N position (Engine run). 

The neutral start switch is connected to the
transmission manual shaft and mounted on the 
transmission case. 

 

 

Condition For Running The DTC 

All of the following conditions are met. 

 (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.