Signal Too Low - Permanent Fault

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

Checking component and wiring



Visually check accelerator pedal (AP) position sensor connector and terminals according to Checking Wiring and Terminals. Permanent Fault

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


Check cable between engine control module (ECM) # B9 (# B19) and accelerator pedal (AP) position sensor # 6 for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Check cable between engine control module (ECM) # B5 (# B15) and accelerator pedal (AP) position sensor # 4 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

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.