Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA20113 MAZDASPEED, 2.3 3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 629 (ENGINE CONTROL SYSTEM)ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTIONCIRCUIT OPEN/SHORT INSPECTION

2011 Mazda 3 Mazdaspeed, 2.3 3

Circuit Open/Short Inspection

2011 Mazda 3 Mazdaspeed, 2.3 3SECTION Circuit Open/Short Inspection

WARNING: This page is about a different car, the 2011 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the PCM connectors.
Disconnect the APP sensor connector.
Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

Fig 1: Identifying APP And PCM Sensor Connector Terminals

Courtesy of MAZDA MOTORS CORP.

Open circuit

If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.

APP sensor terminal A and PCM terminal 1AJ
APP sensor terminal B and PCM terminal 1AV
APP sensor terminal C and PCM terminal 1AP
APP sensor terminal D and PCM terminal 1AL
APP sensor terminal E and PCM terminal 1AS
APP sensor terminal F and PCM terminal 1AO

Short circuit

If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.

APP sensor terminal D and body ground
APP sensor terminal D and power supply
APP sensor terminal A and body ground
APP sensor terminal A and power supply
APP sensor terminal F and body ground
APP sensor terminal F and power supply
APP sensor terminal C and body ground
APP sensor terminal C and power supply

RENDER: 1.0x

NO RELATED

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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.