Isuzu N 2008 Series Workshop Manual page 321

1A-318 Engine Control System (4JJ1)
Step
Important: Reset
regeneration with a scan tool.
Perform the DPD Normal Regeneration with a scan
8
tool.
Does the regeneration start?
Important: Reset
regeneration with a scan tool.
Important: Engine Oil must be replaced after DPD
9
slow regeneration is completed.
Perform the DPD Slow Regeneration with a scan
tool.
Does the regeneration start?
10 Does the regeneration complete?
1. Observe
parameter with a scan tool. Make sure the
temperature is less than 140 °C (284 °F). If
more than 140 °C (284 °F), let increase 1500
RPM without load. (Turn the idle up control
knob clockwise.)
2. Accelerate the engine to W.O.T. (accelerator
11
pedal full travel) and read the Exhaust
Differential Pressure parameter when the
Exhaust Temperature 1 parameter is reached
to 150 °C (302 °F).
Is the Exhaust Differential Pressure parameter less
than the specified value?
Is the Exhaust Differential Pressure parameter
more than the specified value?
12
Notice: If the scan tool displays a message
"Regeneration is impossible", go to applicable
DTC.
1. Remove the DPD filter from the DPD
assembly. Refer to exhaust system in Section
1G Engine Exhaust. Inspect the following
conditions:
• DPD filter for damage, cranks or melt
• Oxygen catalyst for damage, cranks melt
or excessive deposits
13
• Deteriorated oxygen catalyst
2. Test the engine cooling system for an
overheating
System in Section 1C Engine Cooling.
3. Inspect the fuel system problem. Refer to Fuel
System
procedure in Section 1D Engine Fuel.
4. Repair or replace as necessary.
Did you complete the action?
Reconnect all previously disconnected components
or harness connector(s).
14
Did you complete the action?
Action
the DPD Status
the DPD Status
the Exhaust Temperature
condition. Refer to
Check chart and appropriate
Value(s)
before
—
before
—
—
1
4.4 kPa
1.0 kPa
—
Cooling
—
Yes
ECM is not allowing
regeneration
control. Refer to
Test Description and
Go to Step 10
ECM is not allowing
regeneration
control. Refer to
Test Description and
Go to Step 10
Go to Step 11 Go to Step 13
Ash cleaning must
be performed. Refer
to appropriate
procedure in
Section 1G Engine
Go to Step 12
Refer to DTC P2452
for excessive low
exhaust diffrential
System OK pressure diagnosis
Go to Step 14
Go to Step 5
No
the DPD
DTC List
the DPD
DTC List
Exhaust
—
—