P0227

DTC P0227 Accelerator Pedal Position (APP) Sensor 3 Circuit Low Voltage






Circuit Description

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

Conditions for Setting the DTC

^ Voltage is less than .25 volts 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 sensor malfunction present. If two different APP sensors have a malfunction, the "Service Throttle Soon" lamp will light and the 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).
^ Use of a Scan Tool

Diagnostic Aids

A scan tool reads APP 3 position in volts and 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. Refer to "Intermittents", in Section 2.

Test Description

Number(s) below refer to the circled number(s) on the diagnostic table.

2. This step determines if P0227 is the result of a hard failure or an intermittent condition.

3. This step checks the PCM and wiring.