P0226

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

CONDITIONS FOR RUNNING THE DTC
^ The ignition voltage is more than 6.4 volts.
^ The engine speed is more than 300 RPM.
^ There are no in range faults for APP 1 or APP 2-The Powertrain Control Module (PCM) checks for high and low voltage faults.

CONDITIONS FOR SETTING THE DTC
^ The difference between APP 3 and APP 1 is more than 0.23 volts-The PCM compares the pre-scaled voltage that is internal to the PCM.
^ The difference between APP 3 and APP 2 is more than 0.50 volt-The PCM compares the pre-scaled voltage that is internal to the PCM.
^ The conditions are met for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The control module stores the DTC information into memory when the diagnostic runs and fails.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
^ The driver information center, if equipped, may display a message.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC Last Test Failed clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Use a scan tool in order to clear the DTC.

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 cause likely is a PCM condition.

An intermittent may be caused by the following conditions:
^ Faulty connections
^ Rubbed-through wire insulation
^ A broken wire inside the insulation

A scan tool reads the APP 3 position in volts. The scan tool should read approximately 4 volts with the throttle closed and the ignition ON or at idle. The voltage should decrease at a steady rate as the throttle is moved toward a Wide Open Throttle (WOT). Also, 90 percent pedal travel is acceptable for correct APP operation. Scan the APP 3 sensor while depressing the accelerator pedal with the engine stopped and the ignition ON. The display should vary from approximately 4 volts when the throttle was closed to approximately 2 volts when the throttle is held at the WOT position.

TEST DESCRIPTION

Steps 1-3:

Steps 4-12:

The number below refers to the step number on the diagnostic table.
2. This step determines if there is a good reference voltage.