Isuzu N 2008 Series Workshop Manual page 280

Step
1. Turn OFF the ignition.
2. Disconnect the exhaust differential pressure
sensor harness connector.
3. Inspect for
connections and corrosion at the harness
connector of the exhaust differential pressure
sensor (pins 1, 2 and 3 of J33).
4
4. Disconnect the ECM harness connector.
5. Inspect for
connections and corrosion at the harness
connector of the ECM (pins 67, 79 and 80 of
J14).
6. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Test each sensor circuit between the ECM
(pins 67, 79 and 80 of J14) and the exhaust
differential pressure sensor (pins 1, 2 and 3 of
5 J33) for high resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
Important: Replacement
pressure sensor must be learned.
Replace the exhaust differential pressure sensor.
6
Refer to Exhaust Differential Pressure Sensor in
Section 1G Engine Exhaust.
Did you complete the replacement?
1. Reconnect
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
7
4. Turn ON the ignition for 30 seconds while
observing the DTC Information with a scan
tool.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
8
Are there any DTCs that you have not diagnosed?
Action
an intermittent, for
an intermittent, for
exhaust differential
all previously disconnected
Engine Control System (4JJ1)
Value(s)
poor
—
poor
—
—
—
—
Yes
Go to Step 7 Go to Step 5
Go to Step 7 Go to Step 6
Go to Step 7
Go to Step 2 Go to Step 8
Go to DTC List
1A-277
No
—
System OK