Signal Too Low - Permanent Fault

ECM-9540 ACCELERATOR PEDAL (AP) POSITION SENSOR, POWER SUPPLY 5V
SIGNAL TOO LOW - PERMANENT FAULT

Checking component and wiring



Check cable between engine control module (ECM) # B9 (# B19) and accelerator pedal (AP) position sensor # 6 for a short-circuit to ground 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

Remedy as necessary.

Other information
- To connect the breakout box, Connecting the Breakout Box (ECM)
- 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
- Voltage at accelerator pedal (AP) position sensor # 6 should be approximately 5V.


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.