2000 - 2999: 2327

2327-ACCELERATOR PEDAL POSITION MODULE SIGNAL IMPLAUSIBLE

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on. No other APP DTC's set. No Sensor Reference Voltage DTC's set.

- Set Condition:
APP Sensor #1 and APP Sensor #2 signals do not agree for 0.36 seconds.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Theory of Operation

The Accelerator Pedal Position Sensor contains two independent 3 wire sensors. Each sensor provides independent pedal position signals to the ECM. The raw voltage signal from APP #1 sensor is 2 times the raw voltage signal from APP #2. Although the raw voltage signals differ, the scan tool converts and displays these voltages as matching percentages of pedal travel.

Diagnostic Test

1. DTC IS ACTIVE

NOTE: If any Sensor reference or supply voltage DTCs are present, perform the applicable diagnostic procedure before continuing with this test.

NOTE: The APP Sensor is a device that contains 2 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 2 signal should always be approximately 1/2 the voltage of the APP Sensor 1 signal.

Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
Test drive the vehicle.
With the scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

- Go To 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Component Tests and General Diagnostics

2. ACCELERATOR PEDAL POSITION SENSOR CIRCUIT OPEN OR HIGH RESISTANCE
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connector.
Measure the resistance of the Accelerator Pedal Position Sensor No. 1 5 Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.
Measure the resistance of the Accelerator Pedal Position Sensor No. 1 Signal circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.
Measure the resistance of the Accelerator Pedal Position Sensor No. 1 Sensor Ground circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.
Measure the resistance of the Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.
Measure the resistance of the Accelerator Pedal Position Sensor No. 2 Signal circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.
Measure the resistance of the Accelerator Pedal Position Sensor No. 2 Sensor Ground circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms for each of the circuits?

Yes

- Replace the Accelerator Pedal Position Sensor.

No

- Repair the circuit for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. Verification Tests