Isuzu 4JA1 Workshop Manual page 395

Step
7 1. Turn OFF the ignition.
2. Disconnect the MAF sensor harness connector.
3. Inspect for an intermittent, for a poor connection
and corrosion at the harness connector of the
MAF sensor (pin 3 of C-116 connector).
4. Disconnect the engine control module (ECM)
harness connector.
5. Inspect for an intermittent, for a poor connection
and corrosion on each MAF sensor circuit at the
harness connector of the ECM (pin 14 of C-57
connector).
6. Test for high resistance on each MAF sensor
circuit.
7. Repair the circuit(s) as necessary.
Did you find and correct the condition?
8 Replace the EGR valve. Refer to EGR Valve
Replacement in engine mechanical section.
Did you complete the replacement?
9 Replace the EGR solenoid valve. Refer to EGR
Solenoid Valve Replacement in this section.
Did you complete the replacement?
10 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 and warm up (allow engine
coolant temperature to reach at least 60°C
[140°F]) while observing the MAF Sensor
parameter with the scan tool.
Does the MAF Sensor parameter follow the Desired
MAF parameter within 50 mg/strk?
11 Observe the DTC Information with the scan tool.
Are there any DTCs that you have not diagnosed?
Action
Engine Control System (4JH1) 6E-141
Value(s) Yes

Go to Step 10

Go to Step 10

Go to Step 10

Go to Step 11
Go to Diagnostic

Trouble Code (DTC)
List
No
Go to Step 8


Go to Step 2
System OK