Isuzu 2008MY N Series Workshop Manual page 247

1A-244 Engine Control System (4HK1)
Step
1. Turn ON the ignition for 30 seconds. DO NOT
start the engine. Make sure the DPD lamp or
"AUTO
indicators on the instrument panel cluster is
turned OFF. (This is to relearn exhaust
differential pressure sensor.)
2. Clear the DTC and reset the DPD Status with
a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Observe
parameter with a scan tool. Make sure the
3
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.)
6. Accelerate the engine to W.O.T. (accelerator
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?
1. Turn ON the ignition, with the engine OFF.
2. Clear the DTC with a scan tool if set.
3. Turn OFF the ignition for 30 seconds.
Important: Engine oil must be replaced after
4
DPD slow regeneration is completed.
4. Perform the DPD Slow Regeneration with a
scan tool.
Did you complete the action?
1. Clear the DTC with a scan tool if set.
2. Replace the DPD filter. Refer to Exhaust
5
System in Section 1G Engine Exhaust.
Did you complete the replacement?
1. Observe
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
6
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?
Observe the DTC Information with a scan tool.
7
Are there any DTCs that you have not
diagnosed?
Action
REGEN.", "MANUAL
the Exhaust Temperature
the Exhaust Temperature
Value(s)
REGEN."
15.4 kPa (low
1
output) 5.7
kPa (high
output)
—
—
1
5.9 kPa (low
output) 2.5
kPa (high
output)
—
Yes
Go to Step 4 Go to Step 5
Go to Step 6
Go to Step 7
Ash cleaning must
be performed. Refer
to appropriate
procedure in
Section 1G Engine
Go to Step 7
Go to DTC List
No
—
—
Exhaust
System OK