1997 PCED OBDII-Diesel
SECTION 5C: Pinpoint Tests
E: Accelerator Pedal (AP) Sensor
Introduction
  E: Pinpoint Tests  




Signal Functions

The accelerator pedal (AP) sensor provides the powertrain control module (PCM) with the driver's demand for power.

The AP signal is used in calculating desired fuel quantity, injection timing and injection control pressure.





Note: Base idle should be no lower than 0.5 volts.

DTC Descriptions

P0122 = AP sensor circuit low input

P0123 = AP sensor circuit high input

P0220 = Throttle Switch B circuit malfunction

P0221 = Throttle Switch B circuit performance

Fault Detection/Management

Any detected malfunction of the AP sensor will illuminate the CHECK ENGINE light.

An AP signal that is detected out of range high or low by the PCM will cause the engine to ignore the AP signal and will only allow the engine to operate at low idle.

If a disagreement in the state of idle validation switch (IVS) and AP sensor is detected by the PCM, the engine will only be allowed to operate at low idle.

 

 

  E: Pinpoint Tests