P1531

Read the instructions below then start the fault diagnostic procedure.

Symptom: Engine speed limited to 2200 rpm. CHECK ENGINE. Idling speed incorrect. Cruise control not working.

P1531

Fault symptoms

•	Engine speed limited to 2200 rpm.

•	CHECK ENGINE.

•	Idling speed incorrect.

•	Cruise control not working.

On-Board Diagnostics

Type of diagnosis:

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

Enable criteria:

-	Ignition in ON position. Pedal fully released.

Fault criteria:

-	Sum of voltages from pedal position sensors 1 and 2 exceeding adapted sum by more than 6%.

Dependents:

-

None.

System reaction to a fault:

-	Fuel shut-off at engine speeds above 2200 rpm. Throttle control goes into limp-home mode. Limp-home solenoid will be activated 5 times in succession each time the ignition is turned on until the fault has been rectified and the trouble codes cleared.

OK report:

-	Accelerator pedal has been depressed at some time and then fully released. 120 s has expired since then without fault criteria being fulfilled.

Fault handling: (For more information, see .)

-	CHECK ENGINE goes on immediately and can be turned off only by clearing the trouble codes.

Diagnostic help

Fault diagnosis concerns electrical fault in connecting leads or in one of the sensors.

Functions in the diagnostic tool related to the fault:

•	Pedal Position Sensor 1, unit V.

•	Pedal Position Sensor 2, unit V.

For more information, see .

Checking the wiring

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.