P1631

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Possible loss of power before trouble code generated.

P1631

Fault symptoms

•	CHECK ENGINE.

•	Possible loss of power before trouble code 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:

-

Charge air adaptation blocked and zeroed. The charge air pressure start value is used as a substitute value. The purging is blocked. All diagnoses with the general condition that the atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperature must exceed -7°C are blocked.

OK report:

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

Fault handling: (For more information, see .)

-

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 value, unit kPa.

With the engine stationary, the value should correspond with the two other pressure sensors. Accepted difference is 10 kPa.

For information, see .