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P1631

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Possibly limited performance before DTC is generated.

P1631


Internal Control Module. Malfunction.


Fault symptoms


• CHECK ENGINE.

• Possibly limited performance before DTC is generated.


On-Board Diagnostics

Type of diagnosis:


- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.


Enable criteria:


- Crankshaft stationary, even after ignition OFF. Car stationary. The other two absolute pressure sensors deviate less than 10 kPa from each other.

All diagnoses that have the general condition that the atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperatures must exceed -7°C, are blocked.


Fault criteria:


- Sensor value deviates more than 15 kPa from charge air absolute pressure sensor or intake air absolute pressure sensor.


Dependents:


- P0336 and P0337.


System reaction to a fault:


- Starting charge air pressure value used as substitute value. Purge blocked.


OK report:


- Fault criteria for P1631, P1632 or P1633 not fulfilled.


Fault handling: (See “Fault diagnosis, general” for more information.)


- Type III.


Diagnostic help

Fault diagnosis concerns electrical faults in connected leads or in the sensor.

Diagnostic tool functions related to this fault are:


• Diagnostic status for the diagnosis.

• Pressure sensor reading, in kPa.


With the engine switched off, the reading should correspond with those of the other two pressure sensors. Permissible difference is 10 kPa.

See also the description of test values under ”Fault diagnosis, general” for more information.