Circuit DescriptionThe ECM calculates a differential pressure across the turbocharger using the intake manifold pressure sensor and crankcase pressure sensor.

Component LocationThe intake manifold pressure sensor is located in the air intake horn. The crankcase pressure sensor is mounted to the crankcase breather filter housing.

Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is operating.

Conditions for Setting the Fault CodesThe calculated differential pressure across the turbocharger is greater than a threshold.

Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault CodeTo validate the repair, start the engine and let it idle for 1 minute.

The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop TalkPossible causes of this fault code include:

Plugged or restricted air filter pluggedRestricted crankcase breather filter pluggedRestricted crankcase breather plumbing.

Possible Cause:1) Intake Manifold temperature/pressure sensor failure2) ECM calibration