P1631

Read the instructions below then start the fault diagnostic procedure.

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

P1631

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.

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 section Fault handling III, other emission-related components and functions for more information.)

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Type III.

Diagnostic help

Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.

Functions in the diagnostic tool related to the fault:

•	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 description of readings under "Read Values" menu for more information.