INSPECTION

Accelerator Position Sensor (APS) is installed on the accelerator pedal module and detects the rotation angle of the accelerator pedal. The APS is one of the most important sensors in engine control system, so it consists of the two sensors which adapt individual sensor power and ground line. The second sensor monitors the first sensor and its output voltage is half of the first one. If the ratio of the sensor 1 and 2 is out of the range (approximately 1/2), the diagnostic system judges that a malfunction has occurred.
SPECIFICATION

CIRCUIT DIAGRAM

COMPONENT INSPECTION
1. Connect a scantool on Diagnosis Link Connector (DLC).
2. Start engine and check output voltages of APS 1 and 2 at C.T and W.O.T.
Specification

3. Turn ignition switch OFF and disconnect the scantool from the DLC.
4. Disconnect APS connector and measure resistance between APS terminals 4 and 5 (APS 1).

Specification: Refer to SPECIFICATION.

5. Disconnect APS connector and measure resistance between APS terminals 1 and 6 (APS 2).

Specification: Refer to SPECIFICATION.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Accelerator Pedal Position Sensor: Testing and Inspection

Use the Manual With the Right Hardware

When to See a Mechanic

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