Page 455 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-309

DTC inspection
DTC DTC definition Trouble location
conditions
Postprocessing
• Injector
preheat diesel
• Postprocessing
oxidation converter
DOC oxidation
outlet temperature - 04
P3162 catalyst
data is valid but
• Postprocessing
above normal
system
operating range -
• ECM
highest severity level
Postprocessing • Injector
preheat diesel
• When the key • Postprocessing
oxidation converter switch is in ON DOC oxidation
outlet temperature -
P3169 position, the catalyst
data is valid but
diagnosis continues • Postprocessing
above normal
to run. system
operating range -
• ECM
lowest severity level
Postprecessing • Injector
preheat diesel • Postprocessing
oxidation catalytic
DOC oxidation
outlet temperature -
P3249 catalyst
data is valid but
• Postprocessing
above normal
system
operating range
(lowest severity level) • 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 preheat diesel oxidation
converter outlet temperature sensor circuit?

Page 455