Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-950C

Condition




The engine control module (ECM) checks the pulse width modulation (PWM) signal and the analog signal from the accelerator pedal (AP) position sensor.
Diagnostic trouble code (DTC) ECM-950C is stored in the engine control module (ECM) if the engine control module (ECM) registers a fault in the signals from the accelerator pedal (AP) position sensor.
Diagnostic trouble code (DTC) ECM-950C can be diagnosed when the ignition is on.

Substitute value
- Filtered accelerator pedal signal when accelerating
- Acceleration is ignored when braking
- In the event of a detected fault in one of the signals the other signal is used.

Possible source

Analog signal too high:
- Short-circuit to supply voltage in the analog signal cable
- Defective accelerator pedal (AP) position sensor.

Analog signal too low:
- Short-circuit to ground in the signal cable
- Open-circuit in the signal cable
- Open-circuit in analog ground
- Open-circuit in the power supply
- Defective accelerator pedal (AP) position sensor.

Pulse width modulation (PWM) signal too high:
- Short-circuit to ground in the signal cable.

Pulse width modulation (PWM) signal too low:
- Short-circuit to ground in the signal cable
- Short-circuit to supply voltage in the signal cable
- Open-circuit in the signal cable
- Open-circuit in the power supply
- Open-circuit in the ground lead
- Defective accelerator pedal (AP) position sensor.

Faulty pulse width modulation (PWM) signal:
- Loose connections or contact resistance in the terminals on the pulse width modulation (PWM) signal cable
- Interference on the pulse width modulation (PWM) signal cable
- Defective accelerator pedal (AP) position sensor.

Comparison fault:
- Loose connections or contact resistance in the terminals on the analog signal cable
- Fault in the power supply to the analog signal
- Fault in analog ground
- Fault in the pulse width modulated signal cable between the engine control module (ECM) and the accelerator pedal (AP) position sensor
- Defective accelerator pedal (AP) position sensor.

Fault symptom[s]
- Poor accelerator pedal (AP) response
- The accelerator pedal (AP) is ignored when braking.