Page 955 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-269

P4253，P4254，P4255，P4256，P4257，P4258， 04

P4259-POSTPRECESSING PREHEAT DIESEL OXIDATION
CONVERTER TEMPERATURE SENSOR FAULT

P4253-POSTPROCESSING PREHEAT DIESEL OXIDATION
CONVERTER TEMPERATURE SENSOR MODULE - INTELLIGENT
DEVICE OR COMPONENT FAULT

P4254-POSTPROCESSING PREHEAT DIESEL OXIDATION
CONVERTER TEMPERATURE SENSOR MODULE - VOLTAGE IS

ABOVE NORMAL OR SHORTED TO HIGH VOLTAGE POWER
SUPPLY
P4255-POSTPROOCESSING PREHEAT DIESEL OXIDATION

CONVERTER TEMPERATURE SENSOR MODULE - VOLTAGE IS
BELOW NORMAL OR SHORTED TO LOW VOLTAGE POWER

SUPPLY
P4256-POSTPROCESSING PREHEAT DIESEL OXIDATION
CONVERTER TEMPERATURE SENSOR MODULE - DATA IS VALID

BUT ABOVE NORMAL OPERATING RANGE - LOWEST SEVERITY
LEVEL

P4257-POSTPROCESSING PREHEAT DIESEL OXIDATION
CONVERTER TEMPERATURE SENSOR MODULE - ABNORMAL
UPDATE RATE

P4258- POSTPRECESSING PREHEAT DIESEL OXIDATION
CONVERTER TEMPERATURE SENSOR MODULE - UNKNOWN

ROOT CAUSE
P4259-POSTPRECESSING DIESEL PARTICULATE FILTER
TEMPERATURE SENSOR MODULE - UNKNOWN ROOT CAUSE

Description

1 . The postprocessing preheat DOC temperature sensor module is an intelligent
device that communicate with ECM via the J1939 data communication interface.
The postprocessing preheat DOC temperature sensor module directly connect
to the battery power and ground.The postprocessing preheat DOC temperature
sensor module performs autonomous internal diagnosis and reports failure to
the main engine ECM through J1939 data communication interface.The
postprocessing preheat DOC temperature sensor module is sued to measure
the emission from the engine preheat DOC temperature sensor module.