*CHECKING THE ACCELERATOR PEDAL POSITION SENSOR CALIBRATION

For a complete wiring diagram Refer to Section 8W

Diagnostic Test

NOTE: If there are any Accelerator Pedal Position Sensor DTC's active in the ECM, diagnose DTC's before continuing this test.

NOTE: The APP Sensor is a device that contains two separate potentiometer type sensors. Each sensor has its own 5-volt supply circuit, sensor ground circuit and signal circuit. The APP Sensor no longer incorporates a low-idle switch.

NOTE: The APP Sensor 1 signal should always be double the voltage of the APP Sensor 2 signal.

NOTE: Ensure the accelerator pedal is free from any restriction or binding before continuing.

• Go To 2

• Check the APP Sensor circuits for proper resistance. If o.k., replace the APP Sensor in accordance with the Service Information.
• Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

NOTE: APP signals are displayed in voltage and percentage on the scan tool. Although APP 1 voltage is double APP 2 voltage, the percentage display of APP 1 and APP 2 should be within 2.5% of each other during all phases of accelerator pedal travel.

• Go To 3

• Replace the Accelerator Pedal Position Sensor in accordance with the Service Information.
• Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

NOTE: APP signals are displayed in voltage and percentage on the scan tool. Although APP 1 voltage is double APP 2 voltage, the percentage display of APP 1 and APP 2 should be equal during all phases of accelerator pedal travel.

• Go To 4

• Replace the Accelerator Pedal Position Sensor in accordance with the Service Information.
• Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

• Test Complete.

• Check the APP Sensor circuits for proper resistance. If o.k., replace the APP Sensor in accordance with the Service Information.
• Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)