Page 718 - Workshop Manual - Tunland (2017)
P. 718
04-32 DIAGNOSTICS - ENGINE CONTROL SYSTEM
04
Failure code Diagnostic items (DTC definition) Trouble location
• Exhaust pressure sensor
• Open circuit in engine harness,
Exhaust pressure sensor circuit - joint or sensor loop circuit
P2373 voltage is above normal or shorted
• The signal wire is short to the sen-
to high voltage power supply
sor power or battery voltage
• ECM
• Exhaust pressure sensor
• Engine harness or sensor signal
Exhaust pressure sensor circuit -
circuit is open or shorted to ground
P2374 voltage is below normal or shorted • Power line is open or shorted to
to high voltage power supply
ground
• ECM
• Fan
• The engine harness or fan controls
Fan control circuit - voltage is above
solenoid valve is open circuit
P2377 normal or shorted to high voltage
• OEM harness is shorted to power
power supply
supply
• ECM
• Variable geometry turbocharger
VGT actuator drive circuit (motor) -
actuator and its harness
P2387 mechanical system does not respond
• Postprocessing system
or misalignment
• ECM
1 cylinder injector solenoid valve • Injector and its harness
P2442
drive circuit - beyond calibration • ECM
2 cylinder injector solenoid valve • Injector and its harness
P2443
drive circuit - beyond calibration • ECM
3 cylinder injector solenoid valve • Injector and its harness
P2444
drive circuit - beyond calibration • ECM
4 cylinder injector solenoid valve • Injector and its harness
P2445
drive circuit - beyond calibration • ECM
• Variable geometry turbocharger
VGT actuator control - beyond cali-
P2449 actuator and its harness
bration
• ECM
Turbine inlet temperature (calculated • Turbocharger
value) of turbocharger - data is valid
P2451 • Intake system
but above normal operating range - • ECM
medium severity level
• Exhaust pressure sensor pipe
Exhaust pressure - data is unstable,
P2554 • Exhaust pressure sensor and its
intermittent or incorrect
harness
