Page 477 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-331

DTC inspection
DTC DTC definition Trouble location
conditions
• Fuel system
• When the
• Postprocessing
Postprocessing diesel postprocessing DPF differential
particulate filter diesel particulate pressure sensor
P3376 regeneration is filter regeneration is and its harness 04
incomplete - condition complete, the • Postprocessing
exists diagnosis continues system
to run.
• ECM

Diagnosis Procedure
NOTICE

• To implement the following steps, ensure that ECM is grounded properly.
• Before conducting electric diagnosis, do refer to the reference circuit diagram
and the element information.
• Before conducting measurement, check the pins of connectors for rupture,
looseness and rust, and ensure that the pins are contacted properly.
• If the connection is good, check the sensor signal voltage when moving the
connector and harness. If a fault occurs, the voltage display on the diagnostic
instrument will change.

1 . DTC inspection
(a) Ignition switch: OFF.
(b) Connect the diagnostic apparatus.
(c) Use the diagnostic apparatus, read the fault code.
(d) Confirm whether there is fault code related to postprocessing DPF incomplete
regeneration circuit ?
Is the inspection result normal?

YES>To step 2.
NO>Intermittent trouble exists.

2 . Check the mechanical system of the engine

(a) Check whether the injector works abnormally.
(b) Check whether the appearance of postprocessing diesel catalytic converter is blocked.
(c) Check whether there is excessive dust accumulated in the postprocessing DPF.

Is the inspection result normal?

YES>To step 3.
NO>Check the fault location.

3 . Check postprocessing diesel particulate filter differential pressure sensor circuit

(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.

Page 477