P023D
From DISCO3.CO.UK Knowledge Base
Codes starting P023D are related to Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor A Correlation.
Contents
P023D-21
Description
Manifold absolute pressure (MAP) sensor/right-hand turbocharger boost sensor correlation - signal amplitude less than minimum
Meaning
The turbocharger boost pressure the engine ECU (PCM) is seeing is less than the minimum it was expecting. So the turbo is underboosting.
Causes
- Intake air system fault
- Turbocharger mechanical fault
- Oil ingestion into manifold
Resolution
- Check the intake air system.
- Check the turbocharger mechanical condition and operation.
- Check for oil being drawn into the intake manifold.
- Rectify as necessary.
- Using a data logger function, monitor the turbocharger actuator position and command the actuator to 5% pulse width modulated (PWM), then 95% pulse width modulated (PWM) in 5% steps. Check the results. There should be a smooth curve between the minimum and maximum values. If not, install a new turbocharger.
- Clear the DTCs and test for normal operation.
Notes
May be sticky turbocharger actuator arm?
P023D-22
Description
Manifold absolute pressure (MAP) sensor/right-hand turbocharger boost sensor correlation - signal amplitude greater than maximum
Meaning
The turbocharger boost pressure the engine ECU (PCM) is seeing is more than the maximum it was expecting. So the turbo is overboosting.
Causes
- Intake air system fault
- Turbocharger mechanical fault
- Intake air temperature (IAT) sensor fault
- Mass air flow (MAF) sensor fault
- Manifold absolute pressure and temperature (MAPT) sensor fault
- Exhaust gas recirculation (EGR) sensor fault
- Turbocharger actuator position sensor fault
Resolution
- Check the intake air system.
- Check the turbocharger mechanical condition and operation.
- Check for DTCs indicating a listed sensor fault.
- Rectify as necessary.
- Using a data logger function, monitor the turbocharger actuator position and command the actuator to 5% pulse width modulated (PWM), then 95% pulse width modulated (PWM) in 5% steps. Check the results. There should be a smooth curve between the minimum and maximum values. If not, install a new turbocharger.
- Clear the DTCs and test for normal operation.
Notes
May be sticky turbocharger actuator arm?
