Isuzu N 2008 Series Workshop Manual page 319

1A-316 Engine Control System (4JJ1)
Step
1. Verify whether the instrument panel (IP)
cluster is operational.
2. Turn ON the ignition for 30 seconds, with the
engine OFF.
2
Does the DPD amber lamp or "AUTO REGEN.",
"MANUAL REGEN." indicators turn ON, and then
turn OFF?
1. Inspect engine oil level. Make sure the oil
amount is within a range.
2. Install a scan tool.
3. Start the engine.
3
4. Observe
parameter with a scan tool.
Does the scan tool indicate ON and OFF with each
switch transition?
Action
the DPD Regeneration Switch
Value(s) Yes
—
Go to Step 3
—
Go to Step 4
No
Refer to P1669 for
DPD amber lamp
circuit diagnosis or
Refer to IP cluster
diagnosis in Section
9E Instrumentation/
Driver Info.
Go to Step 15