P0228

Diagnostic Chart:

Wiring Diagram:

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

CONDITIONS FOR SETTING THE DTC
- Voltage is greater than 4.75 volts for 2 seconds on APP 3 sensor.
- Conditions met for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The input from APP 3 sensor is ignored.
- A current and history DTC will set but it will not turn ON the Service Throttle Soon lamp.
- 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 Powertrain Control Module (PCM) will limit 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 when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle.

DIAGNOSTIC AIDS
A scan tool reads APP 3 position in volts. Should read about 4.0 volts with throttle closed and ignition ON or at idle. Voltage should decrease at a steady rate as throttle is moved toward Wide Open Throttle (WOT). Also, 90% pedal travel is acceptable for correct APP operation. Scan APP 3 sensor while depressing accelerator pedal with engine stopped and ignition ON. Display should vary from about 4.0 volts when throttle was closed to about 2.0 volts when throttle is held at Wide Open Throttle (WOT) position.

TEST DESCRIPTION
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 wiring.