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Fuel Injector Resistance - Miata

  1. Resistance Inspection

    Disconnect fuel injector 2-pin harness connector. Using ohmmeter, measure resistance between fuel 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 fuel injector(s) as necessary.

  2. Open Circuit Inspection

    Check for continuity between following terminals:
    • GND circuit - No. 1 cylinder fuel injector harness connector terminal "B" and PCM 17-pin harness connector terminal No. 2A (Yellow/Black wire).
    • GND circuit - No. 2 cylinder fuel injector harness connector terminal "B" and PCM 17-pin harness connector terminal No. 2D (Violet/Green wire).
    • GND circuit - No. 3 cylinder fuel injector harness connector terminal "B" and PCM 17-pin harness connector terminal No. 2G (Yellow/Red wire).
    • GND circuit - No. 4 cylinder fuel injector harness connector terminal "B" and PCM 17-pin harness connector terminal No. 2J (Yellow/Green wire).
    • Power circuit - No. 1 cylinder fuel injector harness connector terminal "A" (Green/Blue wire) and main relay 4-pin harness connector terminal "D" (White/Blue wire) through common connector.
    • Power circuit - No. 2 cylinder fuel injector harness connector terminal "A" (Green/Blue wire) and main relay 4-pin harness connector terminal "D" (White/Blue wire) through common connector.
    • Power circuit - No. 3 cylinder fuel injector harness connector terminal "A" (Green/Blue wire) and main relay 4-pin harness connector terminal "D" (White/Blue wire) through common connector.
    • Power circuit - No. 4 cylinder fuel injector harness connector terminal "A" (Green/Blue wire) and main relay 4-pin harness connector terminal "D" (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 "B" and PCM 17-pin harness connector terminal No. 2A (Yellow/Black wire) to ground.
    • No. 2 cylinder fuel injector harness connector terminal "B" and PCM 17-pin harness connector terminal No. 2D (Violet/Green wire) to ground.
    • No. 3 cylinder fuel injector harness connector terminal "B" and PCM 17-pin harness connector terminal No. 2G (Yellow/Red wire) to ground.
    • No. 4 cylinder fuel injector harness connector terminal "B" and PCM 17-pin harness connector terminal No. 2J (Yellow/Green wire) to ground.

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

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