Faulty Signal

ECM-917F ACCELERATOR PEDAL (AP) POSITION SENSOR, INTERNAL FAULT
FAULTY SIGNAL

General
This diagnostic trouble code (DTC) can be caused by other problems with the accelerator pedal (AP) position sensor. Has the engine control module (ECM) stored any diagnostic trouble code (DTC) indicating this? Fault-trace and remedy these diagnostic trouble codes (DTCs) first.

Are any other diagnostic trouble codes (DTC) for the accelerator pedal position sensor stored in the engine control module (ECM)?
Yes - Testing Complete.
No - Continue below.


Checking connectors
Check that the connector terminals for the electronic throttle module are OK. Check that there is voltage to the throttle unit from the system relay. With ignition on there should be a cheeping noise from the throttle unit for a moment, when it receives voltage.

Check that the battery voltage is normal. Check that the charging status of the battery is OK.

Symptom check
In certain specific cases, to determine if the fault is permanent or intermittent, the engine must be started and stopped up to three times (to force the fault to occur). Cancel when the symptoms appear in the car but keep the engine running.

Hint: Check for symptoms between each start of the engine. See the fault code information. The symptom "accelerator pedal (AP) is ignored when braking" can be used as a check. In the event of faults, it is not possible to increase the engine speed (RPM) at the same time as the brake pedal is depressed.

Note! The voltage supply to the electronic throttle module must be interrupted to empty the memory between each start.

Hint: Interrupt the supply voltage to the electronic throttle module by removing the affected fuse (do not forget to reinstall the fuse before the next engine start). See the fuses In the integrated relay/fusebox in the engine compartment.

Read off diagnostic trouble codes (DTCs) with the engine running.

Is only diagnostic trouble code (DTC) ECM-917F stored?
Yes - Continue below.
No - Testing Complete.


Replacing the component
- Ignition off.

The engine control module (ECM) has registered an internal fault. Try a new engine control module (ECM).

Note! A new control module is delivered without software. The control module must be programmed in order to function after replacement.

Checking the software in the electronic throttle module
To avoid later problems check the software for the throttle unit.

Check that the software corresponds to VOLVO's latest software. Read off the software number. See the technical journal for the latest software.

Remedy as necessary.