Isuzu 2008MY N Series Workshop Manual page 340

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 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 the DPD Switch parameter with a
scan tool.
Does the scan tool indicate ON and OFF with
each switch transition?
Action
Engine Control System (4HK1)
Value(s) Yes
—
Go to Step 3
—
Go to Step 4
1A-337
No
Refer to P1669 for
DPD lamp circuit
diagnosis or Refer
to IP cluster
diagnosis in Section
9E Instrumentation/
Driver Info.
Go to Step 15