Isuzu 4JA1 Workshop Manual page 308

6E-54 Engine Control System (4JH1)
Step
4 1. Test the 5 volts reference circuit between the
engine control module (ECM) (pin 2 of C-57
connector) and the MAF sensor (pin 4 of C-116
connector) for the following conditions:
•
A short to battery or ignition voltage
•
A short to the sensor ignition voltage
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
5 Replace the MAF sensor. Refer to Mass Air Flow
Sensor Replacement in this section.
Did you complete the 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
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 3 Go to Step 8
Go to Diagnostic
List
No


System OK