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Fuel Injector Resistance - Mazda6 (3.0L)

  1. Resistance Inspection

    Disconnect fuel injector 2-pin harness connector. Using ohmmeter, measure resistance between injector terminals. See FUEL INJECTOR RESISTANCE SPECIFICATIONS  table. If fuel injector resistance is as specified, check for open or short circuit, go to next step. If fuel injector resistance reading is not as specified, replace faulty injector(s) as necessary.

  2. Open Circuit Inspection

    Disconnect PCM 104-pin harness connector. Check for continuity between following terminals:
    • No. 1 cylinder fuel injector harness connector terminal "A" (Black/White wire) and PCM 104-pin harness connector terminal No. 75 (Yellow/Black wire).
    • No. 2 cylinder fuel injector harness connector terminal "A" (Black/Yellow wire) and PCM 104-pin harness connector terminal No. 101 (Red/Blue wire).
    • No. 3 cylinder fuel injector harness connector terminal "A" (Black/Blue wire) and PCM 104-pin harness connector terminal No. 74 (Yellow/Red wire).
    • No. 4 cylinder fuel injector harness connector terminal "A" (Black/Orange wire) and PCM 104-pin harness connector terminal No. 100 (Yellow/Blue wire).
    • No. 5 cylinder fuel injector harness connector terminal "A" (Black/Green wire) and PCM 104-pin harness connector terminal No. 73 (Black/Red wire).
    • No. 6 cylinder fuel injector harness connector terminal "A" (Black/Red wire) and PCM 104-pin harness connector terminal No. 99 (Blue/White wire).
    • No. 1 cylinder fuel injector harness connector terminal "B" (Green/White wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
    • No. 2 cylinder fuel injector harness connector terminal "B" (Green/Yellow wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
    • No. 3 cylinder fuel injector harness connector terminal "B" (Green/Blue wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
    • No. 4 cylinder fuel injector harness connector terminal "B" (Green/Red wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
    • No. 5 cylinder fuel injector harness connector terminal "B" (Green/Black wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
    • No. 6 cylinder fuel injector harness connector terminal "B" (Green/Orange wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.

    If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

  3. Short Circuit Inspection

    Check for continuity between following:
    • No. 1 cylinder fuel injector harness connector terminal "A" (Black/White wire) and ground.
    • No. 2 cylinder fuel injector harness connector terminal "A" (Black/Yellow wire) and ground.
    • No. 3 cylinder fuel injector harness connector terminal "A" (Black/Blue wire) and ground.
    • No. 4 cylinder fuel injector harness connector terminal "A" (Black/Orange wire) and ground.
    • No. 5 cylinder fuel injector harness connector terminal "A" (Black/Green wire) and ground.
    • No. 6 cylinder fuel injector harness connector terminal "A" (Black/Red wire) and ground.
    • No. 1 cylinder fuel injector harness connector terminal "B" (Green/White wire) and power supply.
    • No. 2 cylinder fuel injector harness connector terminal "B" (Green/Yellow wire) and power supply.
    • No. 3 cylinder fuel injector harness connector terminal "B" (Green/Blue wire) and power supply.
    • No. 4 cylinder fuel injector harness connector terminal "B" (Green/Red wire) and power supply.
    • No. 5 cylinder fuel injector harness connector terminal "B" (White/Blue wire) and power supply.
    • No. 6 cylinder fuel injector harness connector terminal "B" (Green/Orange wire) and power supply.

    If continuity is present, repair short circuit in suspect wire or replace wire harness.

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