Faulty Signal

ECM-951F ACCELERATOR PEDAL (AP) POSITION SENSOR, INTERNAL FAULT
FAULTY SIGNAL

Checking the status

Note! If diagnostic trouble code (DTC) ECM-950F is stored, do not carry out the following fault-tracing.

- Start the engine.

Check whether the fault is permanent or intermittent. Reading off the pulse width modulation (PWM) signal from the accelerator pedal (AP) position sensor. Also read off the pulse width modulation (PWM) signal from the accelerator pedal (AP) position sensor via the electronic throttle module (ETM).

Check that the difference between the signals is not more than approximately 10%. Check that the value is between 6�9% with an unaffected accelerator pedal (AP) and that the values increase as the accelerator pedal (AP) is pressed.

The fault is intermittent if the signals are correct.


Checking the wiring and components

Note! If diagnostic trouble code (DTC) ECM-950F is stored, do not carry out the following fault-tracing.

Check the electronic throttle module (ETM) connector. Check for contact resistance and oxidation. In particular check terminals #1 (PWM signal), #3 (CAN H) and #4 (CAN L).

Check the signal cable (PWM signal) between engine control module (ECM) terminal #A56 (#A56) and electronic throttle module (ETM) terminal #1. Check for an open-circuit. Check for a short-circuit to supply voltage. Check for a short-circuit to ground.

Try a new electronic throttle module (ETM) if no fault is found during the above fault-tracing.

Note! If diagnostic trouble code (DTC) ECM-950F is stored, the electronic throttle module (ETM) is probably not the cause.

Caution! A new electronic throttle module (ETM) is delivered without software. For the electronic throttle module (ETM) to function after replacement, it must be programmed.

Other information
-Throttle body (electronic throttle module (ETM)), replacing
- Checking Wiring and Terminals


Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Check the function. Read off the pulse width modulation (PWM) signal from the accelerator pedal (AP) position sensor and the pulse width modulation (PWM) signal from the accelerator pedal (AP) position sensor via the electronic throttle module (ETM).

Check that the difference between the signals is not more than approximately 10%. Check that the value is between 6�9% with an unaffected accelerator pedal (AP) and that the values increase as the accelerator pedal (AP) is pressed.

Is the function correct?
Yes - Tesing Complete.
No - Continue below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed. Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.