Isuzu 4JA1 Workshop Manual page 479

Step
4 1. Test the control circuit of the MIL between the
engine control module (ECM) (pin 39 of C-56
connector) and the IP cluster (pin 38 of B-23
connector) for a short to battery or ignition
voltage.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
5 Repair or replace the IP cluster.
Did you complete the repair or replacement?
6 Important: Replacement
programmed.
Replace the ECM. Refer to Engine Control Module
(ECM) Replacement in this section.
Did you complete the replacement?
7 1. Reconnect all previously disconnected harness
connector(s).
2. Clear the DTCs with the scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Monitor the DTC Information with the scan tool.
Did the DTC fail this ignition?
8 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-225
Value(s)


be



Trouble Code (DTC)
Yes
Go to Step 7 Go to Step 6
Go to Step 7
Go to Step 7
Go to Step 2 Go to Step 8
Go to Diagnostic
List
No


System OK