P0220

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The Accelerator Pedal Position (APP) module provides a voltage signal that changes relative to the accelerator pedal position. There are 3 sensors located within the APP module that are scaled differently.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
^ The reference voltage on APP 2 is less than 4.8 volts.
^ The condition is met for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The service throttle soon lamp will not illuminate when one APP DTC sets. The PCM will only illuminate the service throttle soon lamp when multiple APP DTCs set.
^ The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A History DTC clears after 40 consecutive warm-up cycles, if this or any other emission-related diagnostic does not report any failures.
^ Use a scan tool in order to clear the DTCs.

DIAGNOSTIC AIDS
There are no driveability issues associated with the APP module unless a DTC is present. The most likely causes of this DTC are faulty connections or the sensor itself. The least likely cause is a PCM problem. All 5-volt reference circuits must be checked for a proper reference voltage. Voltmeter accuracy is important.

TEST DESCRIPTION
The numbers below refer to the step numbers on the Diagnostic Table.
2. This step will determine if there is a good voltage reference.