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MPV, Protege & Protege5

WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

  1. Resistance Inspection

    Disconnect Engine Coolant Temperature (ECT) sensor 2-pin harness connector. Remove ECT sensor. Place sensor and a thermometer in a container of water. Connect ohmmeter between ECT sensor terminals. Slowly heat water. Observe resistance reading at specified temperatures. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR SPECIFICATIONS  table. If ECT sensor resistance reading is as specified but PID value is not within specification, perform open or short circuit inspection. Go to next step. If resistance reading is not as specified, replace ECT sensor.

  2. Open Circuit Inspection

    Disconnect PCM 104-pin harness connector and install 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity in following circuits:
    • ECT signal circuit between ECT sensor harness connector terminal "A" and breakout box terminal No. 38 through common connector.
    • GND circuit between ECT sensor harness connector terminal "B" and breakout box terminal No. 91.

    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 in following circuits:
    • ECT signal circuit between ECT sensor harness connector terminal "A" and PCM 104-pin harness connector terminal No. 38 to ground.
    • ECT signal circuit between ECT sensor harness connector terminal "A" and PCM 104-pin harness connector terminal No. 38 to power supply.
    • GND circuit between ECT sensor harness connector terminal "B" and PCM 104-pin harness connector terminal No. 91 to power supply.

    If continuity is present, repair short circuit in suspect wire or replace wire harness. If open or short circuit is not present, replace ECT sensor.

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