Page 957 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-271

04
DTC inspection
DTC DTC definition Trouble location
conditions
Postprocessing
preheat diesel • Postprocessing
oxidation converter DOC temperature
P4253 temperature sensor sensor module and
module - intelligent its harness
device or component • ECM
fault
Postprocessing
preheat diesel • 蓄电池
oxidation converter • Postprocessing
temperature sensor DOC temperature
P4254
module - voltage is sensor module and
above normal or its harness
shorted to high • ECM
voltage power supply.
Postprocessing
preheat diesel • 蓄电池
oxidation converter • Postprocessing
temperature sensor DOC temperature
P4255
module - voltage is • When the key sensor module and
below normal or switch is in ON its harness
shorted to low voltage position, the • ECM
power supply. diagnosis continues
to run.
Postprocessing
preheat diesel • Postprocessing
oxidation converter
DOC temperature
temperature sensor
P4256 sensor module and
module- data is valid
its harness
but above normal
• ECM
operating range -
lowest severity level

Postprocessing • Postprocessing
preheat diesel
DOC temperature
oxidation converter
P4257 sensor module and
temperature sensor
its harness
module - abnormal
• ECM
update rate.
Postprocessing
• Postprocessing
preheat diesel
DOC temperature
oxidation converter
P4258 sensor module and
temperature sensor
its harness
module - root cause • ECM
unknow.