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HOMESERVICE MANUALSMAZDA20113 MAZDASPEED, 2.3 3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 26 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)COMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULEPOWER CIRCUITS
2011 Mazda 3 Mazdaspeed, 2.3 3

Power Circuits

2011 Mazda 3 Mazdaspeed, 2.3 3SECTION Power Circuits
WARNING: This page is about a different car, the 2002 Mazda Tribute, 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition switch off. Disconnect PCM harness connector and connect 104-Pin Breakout Box (49-UN01-130). See Fig 1 . Using a DVOM, check for battery voltage between ground and PCM terminal No. 55 (KAPWR). Turn ignition switch to START or RUN position. Check for battery voltage between ground and PCM connector terminal No. 71 (VPWR). See Fig 2 -Fig 6 . If battery voltage is not present, power is not being supplied from PCM power relay. See WIRING DIAGRAMS article.

Fig 1: Identifying 104-Pin Break Out Box
G00127421Courtesy of MAZDA MOTORS CORP.
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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.