Signal Too Low - Intermittent Fault

ECM-9520 ACCELERATOR PEDAL (AP) POSITION SENSOR, FAULTY SIGNAL
SIGNAL TOO LOW - INTERMITTENT FAULT

Checking wiring and connectors






Check accelerator pedal (AP) position sensor connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check the cable between engine control module (ECM) # B25 (# B35) and accelerator pedal (AP) position sensor # 2 for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check cable between engine control module (ECM) # B25 (# B35) and accelerator pedal (AP) position sensor # 2 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check the power supply cable between accelerator pedal (AP) position sensor # 1 and the fuse (see the wiring diagram) for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults, also check that the fuse has not blown.

Check the ground lead between accelerator pedal (AP) position sensor # 3 and the ground terminal for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

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
- The signal from accelerator pedal (AP) position sensor # 2 is a pulse width modulation (PWM) signal, # 2 is power supply (12V) and # 3 is the ground terminal.
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.