Isuzu 4JA1 Workshop Manual page 381

Step
7 1. Reconnect all previously disconnected relay or
harness connector(s).
2. Clear the DTCs with the scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Cool down the engine as necessary (allow
engine coolant temperature to cool down at least
50°C [122°F]).
5. Start the engine.
6. 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
Engine Control System (4JH1) 6E-127
Value(s) Yes

Go to Step 2
Go to Diagnostic

Trouble Code (DTC)
List
No
Go to Step 8
System OK