P023D

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Codes starting P023D are related to Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor A Correlation.

This code is raised by the engine ECU (PCM).


P023D-21

aka P023D21

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

aka P023D22

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?