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Fuel Injector Resistance - Mazda6 (2.3L)

  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 reading is as specified, go to next step. If resistance reading is not as specified, replace faulty fuel injector(s) as necessary.

  2. Open Circuit Inspection

    Check for continuity between following terminals:
    • No. 1 cylinder fuel injector harness connector terminal "B" and PCM 30-pin harness connector terminal No. 4Z.
    • No. 2 cylinder fuel injector harness connector terminal "B" and PCM 30-pin harness connector terminal No. 4W.
    • No. 3 cylinder fuel injector harness connector terminal "B" and PCM 30-pin harness connector terminal No. 4AD.
    • No. 4 cylinder fuel injector harness connector terminal "B" and PCM 30-pin harness connector terminal No. 4AA.
    • No. 1 cylinder fuel injector harness connector terminal "A" and main relay 4-pin harness connector terminal "C" through common connector.
    • No. 2 cylinder fuel injector harness connector terminal "A" and main relay 4-pin harness connector terminal "C" through common connector.
    • No. 3 cylinder fuel injector harness connector terminal "A" and main relay 4-pin harness connector terminal "C" through common connector.
    • No. 4 cylinder fuel injector harness connector terminal "A" and main relay 4-pin harness connector terminal "C" 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 ground.
    • No. 2 cylinder fuel injector harness connector terminal "B" and ground.
    • No. 3 cylinder fuel injector harness connector terminal "B" and body GND.
    • No. 4 cylinder fuel injector harness connector terminal "B" and ground.
    • No. 1 cylinder fuel injector harness connector terminal "A" and power supply.
    • No. 2 cylinder fuel injector harness connector terminal "A" and power supply.
    • No. 3 cylinder fuel injector harness connector terminal "A" and power supply.
    • No. 4 cylinder fuel injector harness connector terminal "A" and power supply.

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

FUEL INJECTOR RESISTANCE SPECIFICATIONS

Application Ohms
MAZDA6 (2.3L) 11.4-12.6
Miata 12.0-13.0
MAZDA6 & MPV (3.0L) 13.1-14.5
Protege & Protege5 14.2-14.8
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