Isuzu N 2008 Series Workshop Manual page 282

Step
1. Inspect the following conditions:
• Plugged, crushed or kinked exhaust
differential pressure hoses or pipes
• Physical
differential pressure sensor
• Any contamination or objects that block
the exhaust differential pressure sensor
port
• Skewed or slow exhaust differential
pressure sensor
• An exhaust system gasket that is missing
or damaged
• Exhaust gas leakage from the exhaust
pipe, gasket, DPD assembly, exhaust
temperature
3
differential pressure hoses or pipes
• Modified exhaust system
• Exhaust throttle valve or exhaust brake
valve for stuck condition. Refer to
Exhaust System in Section 1G Engine
Exhaust.
• Skewed or slow exhaust temperature
sensors
2. Test the engine cooling system for an
overheating
System in Section 1C Engine Cooling.
3. Repair or replace as necessary.
4. Reconnect
harness connector(s) or components.
Did you find and correct the condition?
1. Turn ON the ignition for 30 seconds. DO NOT
start the engine. Make sure the DPD lamps or
"AUTO REGEN.",
indicators on the instrument panel cluster is
turned OFF. (This is to relearn exhaust
differential pressure sensor.)
2. Turn OFF the ignition for 30 seconds.
4
3. Start the engine.
4. Observe the DPD Accumulation Status and
DPD Distance Status with a scan tool and plat
both readings on the DPD status table. Refer
to DPD Status Table in DPD Control System
Check.
Is the intersected of range located in C or D?
1. Turn ON the ignition, with the engine OFF.
2. Clear the DTC and the DPD Status with a
scan tool.
3. Turn OFF the ignition for 30 seconds.
5
Important: Engine oil must be replaced after
DPD slow regeneration is completed.
4. Perform the DPD Slow Regeneration with a
scan tool.
Did you complete the action?
Action
damage of the exhaust
sensor(s) or exhaust
condition. Refer to Cooling
all previously disconnected
"MANUAL REGEN."
Engine Control System (4JJ1)
Value(s) Yes
—
Go to Step 6
—
Go to Step 5
—
Go to Step 7
1A-279
No
Go to Step 4
Go to Step 6
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