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HOMESERVICE MANUALSMAZDA20113 MAZDASPEED, 2.3 3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 629 (ENGINE CONTROL SYSTEM)NEUTRAL SWITCH 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.
  1. Disconnect the PCM connector.
  2. Disconnect the neutral switch connector.
  3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)
Fig 1: Identifying Neutral Switch And PCM Connector Terminals
G05981123Courtesy 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.
  • Neutral switch terminal A and PCM terminal 2AS
  • Neutral switch terminal B and body ground

Short circuit 

  • If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
  • Neutral switch terminal A and body ground
  • Neutral switch terminal A and power supply
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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.