Signal Too High - Permanent Fault

ECM-9530 ACCELERATOR PEDAL (AP) POSITION SENSOR, FAULTY SIGNAL
SIGNAL TOO HIGH - PERMANENT FAULT

Checking component and wiring



Check cable between engine control module (ECM) # B17 (# B27) and accelerator pedal (AP) position sensor # 5 for a short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information:
- For connection of engine control module (ECM) breakout box, Connecting the Breakout Box (ECM)
- To access/replace the accelerator pedal (AP) position sensor, Accelerator Pedal Module, Replacing
- Accelerator pedal (AP) position sensor # 5 transmits an analog signal that varies between approximately 0.45V and approximately 4.5V depending on accelerator pedal (AP) position.
- Accelerator pedal (AP) position sensor # 6 is power supply (5V)
- Accelerator pedal (AP) position sensor # 4 is a signal ground.
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


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.

Do the values correspond?
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.