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Leak Detection Pump - Miata

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. Air Flow Inspection

    Locate leak detection pump. See Figure. Blow air into port "A" (charcoal canister side). Air should flow from port "B". See Figure. If air does not flow from port "B" (air filter side), replace EVAP system leak detection pump. Blow air into port "B". Air should flow from port "A". If air does not flow from port "A", replace EVAP system leak detection pump. If EVAP system leak detection pump is as specified, go to next step.

  2. Resistance Inspection

    Disconnect negative battery cable. Disconnect EVAP system leak detection pump 4-pin harness connector. Using DVOM, check resistance between appropriate terminals on EVAP system leak detection pump. See Figure. See EVAP SYSTEM LEAK DETECTION PUMP RESISTANCE SPECIFICATIONS (MIATA & MPV)  table. If resistance readings are within specification, check for open or short circuit in wiring harness. Go to next step. If resistance readings are not as specified, replace EVAP system leak detection pump.
    EVAP SYSTEM LEAK DETECTION PUMP RESISTANCE SPECIFICATIONS (MIATA & MPV)

    Terminals Resistance (ohms)
    A-B 20-25
    A-C 26.6-32.4
    A-D About 118

  3. Open Circuit Inspection

    Disconnect PCM 17-pin harness connector. Check for continuity between following terminals:
    • EVAP system leak detection pump 4-pin harness connector terminal "A" and main relay terminal "D" (White/Red wire). See Figure.
    • EVAP system leak detection pump 4-pin harness connector terminal "B" (Black wire) and ground.
    • EVAP system leak detection pump 4-pin harness connector terminal "C" and PCM 17-pin harness connector terminal No. 4AH (Red/Green wire).
    • EVAP system leak detection pump 4-pin harness connector terminal "D" (Yellow/Black wire) and PCM 17-pin harness connector terminal No. 3K.

    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.

  4. Short Circuit Inspection

    Check for continuity between following:
    • EVAP system leak detection pump 4-pin harness connector terminal "A" (White/Red wire) and ground.
    • EVAP system leak detection pump 4-pin harness connector terminal "B" (Black wire) and power supply.
    • EVAP system leak detection pump 4-pin harness connector terminal "C" (Red/Green wire) and power supply.
    • EVAP system leak detection pump 4-pin harness connector terminal "D" (Yellow/Black wire) and power supply.

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

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