Diagnostic trouble code (DTC) information ECM-940D

Condition 

Fig 1: Identifying Accelerator Pedal (AP) Position Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers a fault in the analog signal from the accelerator pedal (AP) position sensor.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value 

• The accelerator pedal (AP) is disabled at the same time as the brake pedal is pressed.

Possible Source 

• Contact resistance or oxidation in the terminals between the engine control module (ECM) and the accelerator pedal (AP) position sensor
• Open-circuit in the power supply (12 V) for the accelerator pedal (AP) position sensor
• Open-circuit in the power supply (5 V) for the analog signal
• Open-circuit in the signal ground cable for the analog signal
• Open-circuit or short-circuit to ground in the signal cable
• Damaged accelerator pedal (AP) position sensor.

Fault symptom[s] 

• Poor accelerator pedal (AP) response.