Isuzu N Series 2008, Owner'S Manual

Page: 402 / 580

7-56
SERVICE AND MAINTENANCE
Checking and Cleaning the DPD
Diesel Particulate Defuser (DPD)
NOTE
[Exhaust differential pressure sensor zero point adjustment]
Every year, make a zero point adjustment for the exhaust differential pressure •
sensor that detects clogging in the DPD.
Do not carry out a ZERO point adjustment of the exhaust differential pressure •
sensor within 2 hours after the DPD regeneration because of its sensitivity to
heat.
In addition, after every DPD inspection or DPD filter cleaning, make an exhaust •
differential pressure sensor adjustment according to the following procedure.
1. Turn the starter switch to the "ON" position, and leave it for a while. (Do not start
the engine.)
2. Make sure that the DPD automatic regeneration indicator light and the DPD
manual regeneration indicator light come on (model without multi-information
display (MID)), or the "MANUAL REGEN." message and the "AUTO REGEN."
message appear alternately (model with MID).
3. Make sure that the DPD automatic regeneration indicator light and the DPD
manual regeneration indicator light go off in 30 seconds (model without MID), or
the "MANUAL REGEN." message and the "AUTO REGEN." message go off in 30
seconds (model with MID).
4. Turn the starter switch to the "OFF" position, and leave it there for 15 seconds or
more.
Have the exhaust pressure check performed at your Isuzu Dealer in accordance with
the Maintenance Schedule. The filter may need cleaning depending on the results of
the check. If you cannot do the exhaust pressure check, clean the filter and inspect the
exhaust differential pressure sensor rubber.
CAUTION
Failure to perform checks or cleaning of the DPD could result in a faulty DPD •
and engine damage, or poor fuel economy. Ask your Isuzu Dealer about checks
and cleaning of the DPD.
Maintenance Schedule
→ Refer to page 7-159
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