Isuzu 2008MY N Series, Руководство по ремонту

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Engine Control System (4HK1) 1A-245
DTC P1471 (Flash Code 149)
Description
The ECM detects the condition of PM accumulations
from the exhaust differential pressure sensor attached
to the chassis frame near the diesel particulate defuser
(DPD) assembly. When it is reached to a certain
amount of PM accumulations or a certain length of
mileage, the automatic regeneration starts. If the
automatic regeneration cannot be completed by some
reason, the manual regeneration is requested to the
driver by blinking the DPD lamp or "PUSH DPD
SWITCH" indicator on the instrument panel cluster.
After the regeneration is finished, an exhaust
differential pressure monitors a purification of the filter.
If the filter regeneration has been incomplete
purification status continuously, this DTC will set.
Condition for Running the DTC
• DTCs P0079, P0080, P0116, P0117, P0118,
P0122, P0123, P0201 - P0204, P0335, P0336,
P0404, P0409, P0426, P042B, P042C, P042D,
P0427, P0428, P0500, P0502, P0503, P060B,
P0638, P0641, P0651, P1261, P1262, P1404,
P2146, P2149, P2227, P2228, P2229, P2452 -
P2456 are not set.
• The ignition switch is ON.
• The exhaust gas temperature 1(in front of filter) is
more than 100
°
C (212
°
F).
• The engine speed is more than 1000RPM.
• The EGR position is less than 95%.
• The intake throttle position is more than 22%.
• The DPD filter regeneration is finished.
Condition for Setting the DTC
• The DPD filter regeneration has been incomplete
purification status continuously.
Action Taken When the DTC Sets
• The ECM illuminates the MIL when the diagnostic
runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
• The ECM limits fuel injection quantity.
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type A.
Diagnostic Aids
• If manual regeneration is frequently requested,
refer to DPD System Manual Regeneration
Frequently in this section.
• An excessive ash accumulation in the DPD filter
will cause this DTC to set.
• The mass air flow (MAF) sensor problem will
cause this DTC to set. Refer to DTC P0101 for
MAF sensor diagnosis and Use the Scan Tool Data
List or a known good vehicle to determine nominal
values.
Circuit/ System Testing DTC P1471
Step Action Value(s) Yes No
1
Did you perform the Diagnostic System Check
- Engine Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Engine Controls
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