Faulty Signal - Permanent Fault

ECM-958F ACCELERATOR PEDAL (AP) POSITION SENSOR, FAULTY SIGNAL
FAULTY SIGNAL - PERMANENT FAULT

Checking connector



- Ignition off.
- Visually check accelerator pedal (AP) position sensor terminals.
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Check the function and Read accelerator pedal (AP) analog and pulse width modulated signals. Check that the difference between the signals is not more than 4%. The value is between 6-9% when the accelerator pedal (AP) is unaffected and 85-90% when the accelerator pedal (AP) is filly depressed. If the signal is now OK this indicates that the cause of the fault was loose connections in the terminals.

Other information
- To access/replace the accelerator pedal (AP) position sensor, Accelerator Pedal Module, Replacing
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T

Is the signal OK?
Yes - Testing Complete.
No - Continue below.


Replacing component



Try replacing accelerator pedal (AP) position sensor according to Accelerator Pedal Module, Replacing


Verification



Hint: After carrying out the repair, check that the fault has been remedied.

- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Read of the pulse modulated signal. Try depressing and releasing the accelerator pedal (AP). The value is between 6-9% when the accelerator pedal (AP) is unaffected and 85-90% when the accelerator pedal (AP) is fully depressed.

Is th difference between the analog and pulse width modulated signal less than 4%?
Yes - Testing 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.