DTC |
Condition |
Possible causes |
Action |
P004500 |
Turbocharger/Supercharger Boost Control A Circuit / Open |
- Variable geometry turbocharger (VGT) actuator circuit high
resistance
- VGT actuator circuit short circuit to ground
- VGT actuator failure
- ECM failure
|
Refer to the electrical guides and check the VGT circuit.
Refer to the warranty policy and procedures manual if a module is suspect.
|
P004600 |
Turbocharger/Supercharger Boost Control A Circuit
Range/Performance |
- Variable geometry turbocharger (VGT) actuator circuit high
resistance
- VGT actuator circuit short circuit to ground
- VGT actuator circuit short circuit to power
- VGT actuator failure
- ECM failure
|
Refer to the electrical guides and check the VGT circuit.
Refer to the warranty policy and procedures manual if a module is suspect.
|
P004700 |
Turbocharger/Supercharger Boost Control A Circuit Low |
- Variable geometry turbocharger (VGT) actuator circuit high
resistance
- VGT actuator circuit short circuit to ground
- VGT actuator failure
- ECM failure
|
Refer to the electrical guides and check the VGT circuit.
Refer to the warranty policy and procedures manual if a module is suspect.
|
P004800 |
Turbocharger/Supercharger Boost Control A Circuit High |
- Variable geometry turbocharger (VGT) actuator circuit short circuit
to power
- VGT actuator failure
- ECM failure
|
Refer to the electrical guides and check the VGT circuit.
Refer to the warranty policy and procedures manual if a module is suspect.
|
P023400 |
Turbocharger/Supercharger A Overboost Condition |
- Air leakage
- Manifold absolute pressure (MAP) sensor circuit high resistance
- MAP sensor circuit short circuit to ground
- MAP sensor circuit short circuit to power
- MAP sensor failure
- Exhaust gas recirculation (EGR) fault
- VGT actuator fault
|
Refer to the relevant workshop manual section. Check the MAP
sensor and circuits. Refer to the electrical guides. For EGR valve tests,
refer to the relevant workshop manual section. Check for DTCs indicating
EGR or VGT actuator faults. Refer to the warranty policy and procedures
manual if a module is suspect. |
P029900 |
Turbocharger/Supercharger A Underboost Condition |
- Air leakage post turbocharger
- MAP sensor circuit high resistance
- MAP sensor circuit short circuit to ground
- MAP sensor circuit short circuit to power
- MAP sensor failure
- Exhaust gas recirculation (EGR) fault
- VGT fault
- ECM failure
|
Refer to the relevant workshop manual section. Check the MAP
sensor and circuits. Refer to the electrical guides. For EGR valve tests,
refer to the relevant workshop manual section. Check for DTCs indicating
EGR or VGT actuator faults. Refer to the warranty policy and procedures
manual if a module is suspect. |
P226300 |
Turbocharger/Supercharger Boost System Performance |
- Air leakage post turbocharger
- Intake air temperature (IAT) sensor circuit high resistance, short
circuit to ground, short circuit to power
- Manifold absolute pressure (MAP) sensor circuit high resistance,
short circuit to ground, short circuit to power
- Mass air flow (MAF) sensor circuit high resistance, short circuit to
ground, short circuit to power
- Exhaust gas recirculation (EGR) circuit high resistance, short
circuit to ground, short circuit to power
- VGT actuator failure
- Turbocharger vanes stuck/sticking
|
Check the turbocharger and linkage mechanical condition.
Check the intake air system condition, rectify as necessary. Check for
sensor DTCs. Check the IAT and MAP sensor circuits. Refer to the
electrical guides and rectify as necessary. Using a datalogger function,
check the turbocharger actuator position. Turn the ignition on, engine off
and command the turbocharger actuator to 95% pulse width modulated (PWM)
then to 5% pulse width modulated (PWM) and recheck the turbocharger
actuator position. The value at 95% pulse width modulated (PWM) should be
80 - 95%, and at 5% pulse width modulated (PWM), 0 - 20%. If this is not
the case, install a new turbocharger. Clear the DTCs and test for normal
operation. |