Page 466 - Foton Workshop Manual - Tunland (AT)

04-320 DIAGNOSTICS - ENGINE CONTROL SYSTEM

DTC inspection
DTC DTC definition Trouble location
conditions
• Postprocessing
DPF outlet
Postprocessing diesel temperature sensor
particulate filter outlet
04 • Postprocessing
temperature sensor
DPF temperature
P3321 circuit - voltage is
sensor module and
below normal or its harness
shorted to low voltage
• Postprocessing
power supply
system
• 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 outlet temperature
sensor circuit?

Is the inspection result normal?
YES>To step 2.

NO>Intermittent trouble exists.

2 . Check DPF temperature sensor circuit
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Disconnect DPF temperature sensor connector Q01.
(d) Connect the battery negative cable.
(e) Ignition switch: ON.

Page 466