Isuzu N 2008 Series Workshop Manual page 241

1A-238 Engine Control System (4JJ1)
Step
Repair or replace the IP cluster. Refer to Instrument
Panel (IP) Cluster in Section 9E Instrumentation/
15
Driver Info.
Did you complete the repair or replacement?
Important:
programmed and learned.
16
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
1. Reconnect all previously disconnected fuse or
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
17
4. Turn ON the ignition for 40 seconds while
observing the DTC Information with a scan
tool.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
18
Are there any DTCs that you have not diagnosed?
Circuit/ System Testing DTC P1669 (with Multi-information Display)
Step
Did you perform the Diagnostic System Check -
1 Engine Controls?
1. Verify whether the instrument panel (IP)
cluster is operational.
2. Install a scan tool.
3. Turn OFF the ignition for 30 seconds.
2
4. Turn ON the ignition for 40 seconds while
observing the DTC Information with a scan
tool.
Does the DTC fail this ignition?
1. Turn OFF the ignition.
2. Inspect the Meter (10A) fuse in the cabin fuse
3
block.
Is the Meter (10A) fuse open?
Replace the Meter (10A) fuse. If the fuse continues
to open, repair the short to ground on one of the
circuits that is fed by the Meter (10A) fuse or
4
replace the shorted attached component.
Did you complete the repair?
1. Turn OFF the ignition.
2. Disconnect the ECM J14 harness connector.
3. Turn ON the ignition, with the engine OFF.
5
4. Measure the voltage from the DPD lamp
control circuit in the ECM harness connector
(pin 9 of J14) to a known good ground.
Is the voltage more than the specified value?
Action
Replacement ECM
Action
Value(s)
—
must be
—
—
—
Value(s)
—
—
—
—
20 volts
Yes
Go to Step 17
Go to Step 17
Go to Step 3 Go to Step 18
Go to DTC List
Yes
Go to Diagnostic
System Check -
Go to Step 2 Engine Controls
Go to Diagnostic
Go to Step 3
Go to Step 4 Go to Step 5
Go to Step 15
Go to Step 6 Go to Step 7
No
—
—
System OK
No
Aids
—