Isuzu 4JA1 Workshop Manual page 415

DTC P0602
Description
The engine control module (ECM) has the ability to set
a diagnostic trouble code (DTC) if it detects that there is
no vehicle identification (VIN) programmed.
Step
1 Did you perform the Diagnostic System Check-
Engine Controls?
2 1. Install the scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Monitor the Diagnostic Trouble Code (DTC)
Information with the scan tool.
Does the DTC fail this ignition?
3 Important: Blank engine control module (ECM) must
be programmed.
Program the ECM. Refer to Engine Control Module
(ECM) Replacement in this section.
Did you complete the programming?
4 1. Clear the DTCs with the 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 the scan tool.
Does the DTC fail this ignition?
5 Important: Replacement
programmed.
Replace the ECM. Refer to Engine Control Module
(ECM) Replacement in this section.
Did you complete the replacement?
6 1. Clear the DTCs with the scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Monitor the DTC Information with the scan tool.
Did the DTC fail this ignition?
7 Observe the DTC Information with the scan tool.
Are there any DTCs that you have not diagnosed?
Action
ECM must
Engine Control System (4JH1) 6E-161
Diagnostic Aids
Notice:
• Production and service ECM does not require
software programming when it is replaced except
calibration software update. This DTC indicates
that a production or service ECM does not
program VIN.
DTC P0602
Value(s)




be



Trouble Code (DTC)
Yes
Go to Diagnostic
System Check-
Go to Step 2 Engine Controls
Go to Step 3 Go to Step 6
Go to Step 4
Go to Step 5 Go to Step 7
Go to Step 6
Go to Step 3 Go to Step 7
Go to Diagnostic
List
No


System OK