Page 472 - Foton Workshop Manual - Tunland (AT)

04-326 DIAGNOSTICS - ENGINE CONTROL SYSTEM

DTC inspection
DTC DTC definition Trouble location
conditions
• Postprocessing
DOC inlet
Postprocessing diesel temperature sensor
particulate filter inlet
04 • Postprocessing
temperature - data is
DPF temperature
P3311 valid but above
sensor module and
normal operating its harness
range - highest
• Postprocessing
severity level
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 preheating diesel oxidation
converter inlet 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 472