Isuzu 2008MY N Series Workshop Manual page 342

Step
Important: Reset
regeneration with a scan tool.
Perform the DPD Regeneration with a scan tool.
8
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?
Does the regeneration complete?
10
1. Observe the
parameter with a scan tool. Make sure the
temperature is less than 150 °C (302 °F). If
more than 150 °C (302 °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 200 °C (392 °F).
Is the Exhaust Differential Pressure parameter
less than the specified value?
Is the Exhaust Differential Pressure parameter
12
more than the specified value?
Notice: If the scan tool displays a message "The
failure in which compulsive regeneration is
impossible was detected", go to applicable DTC.
1. Remove the DPD filter from the DPD
assembly. Refer to Exhaust Pipe 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 Check
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
Exhaust Temperature
condition. Refer to Cooling
chart and appropriate
Engine Control System (4HK1)
Value(s)
before
—
before
—
—
1
5.9 kPa (low
output) 2.5
kPa (higt
output)
1.0 kPa
—
—
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
System OK Refer to DTC P2452
Go to Step 14
Go to Step 5
1A-339
No
the DPD
DTC List
the DPD
DTC List
Exhaust
—
—