Page 723 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-37

04
Failure code Diagnostic items (DTC definition) Trouble location
• Postprocessing system
• ECM

• Postprocessing DPF outlet temper-
Postprocessing diesel particulate fil- ature sensor
ter outlet temperature sensor circuit • Postprocessing DPF temperature
P3321
- voltage is below normal or shorted sensor module and its harness
to low voltage power supply • Postprocessing system
• ECM

• Variable geometry turbocharger
Intake manifold 1 pressure - Abnor- (VGT) actuator and its harness
P3361
mal change rate • Postprocessing system
• ECM

• Fuel system
postprocessing diesel particulate filter • Postprocessing DPF differential
P3376 regeneration is incomplete - Prob- pressure sensor and its harness
lems exist • Postprocessing system
• ECM

• EGR system
Engine EGR system - data valid but • Intake mass flow sensor and its
P3382 below normal operating range - harness
medium severity level • Intake system
• ECM

• EGR system
• Intake mass flow sensor and its
Engine EGR system - data valid but harness
P3383 above normal operating range -
• Intake throttle actuator
medium severity level
• Intake system
• ECM

• ABS、BCM、CAN bus and har-
Anti lock brake (ABS) controller -
P3488 ness
Abnormal updating rate
• ECM
• Intake throttle actuator position
sensor
Engine intake air throttle actuator
• Open circuit in harness, connector
position sensor circuit - voltage is
P3539 or sensor loop
above normal or shorted to high
• The signal line is short to the sen-
voltage power supply
sor power
• ECM

Engine intake air throttle actuator • Intake throttle actuator position
P3541
position sensor circuit - voltage is sensor