P1631

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Power may be limited before the diagnostic trouble code is generated.

P1631

Fault symptoms

•	CHECK ENGINE.

•	Power may be limited before the diagnostic trouble code is generated.

On-Board Diagnostics

Type of diagnosis:

-	Continuous. However, it is interrupted once the fault criteria have been fulfilled and does not restart until the next driving cycle.

Enable criteria: (Conditions that must be fulfilled for diagnostics to be performed.)

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

Fault criteria: (When enable criteria have been fulfilled, diagnostics will check if the fault criteria have been fulfilled.)

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

Dependents: (Once fault criteria have been fulfilled, a number of other diagnostics must report OK before the diagnostic trouble code can finally be generated.)

-	P0336 and P0337.

System reaction to a fault: (Once the fault criteria have been fulfilled, certain measures will sometimes be taken.)

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

OK report: (This diagnosis may be included as a dependent to another diagnosis and must therefore report OK even if it is continuous. The OK report is also used in fault handling to count down the fault counter.)

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

Fault handling: (Refer to section “Fault diagnosis, general” for more information.)

-

Type III.

Diagnostic help

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

Diagnostic tool functions related to this fault:

•	Diagnostic status for the diagnosis.

•	Pressure sensor reading, unit kPa.

When the engine is stationary, the value should correspond with that of the other two pressure sensors. Permissible difference is 10 kPa.

Refer also to the description of readings under ”Fault diagnosis, general” for more information

See .