P0228

Diagnostic Chart:

Wiring Diagram:

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

CONDITIONS FOR SETTING THE DTC
^ The voltage is greater than 4.75 volts for 2 seconds on the APP 3 sensor.
^ The conditions were met for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The input from the APP 3 sensor is ignored.
^ This DTC will not turn the Service Throttle Soon lamp ON by itself.
^ The throttle will operate normally as long as there is only one malfunction present. If two different APP sensors have a malfunction, the Service Throttle Soon lamp will light and the PCM will limit the power. If three APP sensors have a malfunction present, the Service Throttle Soon lamp will light and the PCM will only allow the engine to operate at idle.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A History DTC will clear after forty consecutive warm-up cycles during which the diagnostic does not fail (the coolant temperature has risen 5°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle).
^ Use of a Scan tool will clear the DTC codes.

DIAGNOSTIC AIDS
There are no driveability issues associated with the APP module unless a DTC is present. The most likely cause of this DTC are poor connections or the sensor itself. The least likely is a PCM problem.
A scan tool reads the APP 3 position in volts. The scan tool should read about 4.0 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% pedal travel is acceptable for a 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 about 4.0 volts when the throttle is closed to about 2.0 volts when the throttle is held at a Wide Open Throttle (WOT) position.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on Diagnostic Table.
2. This step will determine if DTC P0228 is the result of a hard failure or an intermittent condition.
3. This step checks the PCM and the wiring.