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

Ground Circuits

2011 Mazda 3 Mazdaspeed, 2.3 3SECTION Ground 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.
  1. Turn ignition switch off. Locate Powertrain Control Module (PCM). See POWERTRAIN CONTROL MODULE LOCATION  table. Disconnect PCM harness connector. Using a DVOM, check continuity between ground and PCM connector pins. See IDENTIFYING PCM GROUND PINS  table. See Figure -Figure . If continuity is not present, repair open ground circuit as necessary. If continuity is present, go to next step.
    POWERTRAIN CONTROL MODULE LOCATION

    Application Location
    All Models Center Of Engine Compartment, Mounted On Cowl
    IDENTIFYING PCM GROUND PINS

    Application PCM Ground Pin No.
    Except Tribute 24, 25, 51, 76, 77 & 103
    Tribute
    2.0L 23, 24, 25, 33, 51, 76, 77 & 103
    3.0L 3, 24, 25, 51, 76 & 103
  2. Connect DVOM negative lead to a good ground. With vehicle running, backprobe DVOM positive lead to each ground terminal. DVOM should indicate less than one volt. If reading is greater than one volt, check for open, corrosion or loose connection on ground circuit.
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.