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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 63 (ENGINE CONTROLS [SYSTEM & COMPONENT TESTING])ENGINE SENSORS & SWITCHESINTAKE AIR TEMPERATURE SENSORMPV
1999 Mazda 626 ES, 2.5 D, Standard

Intake Air Temperature Sensor: MPV

1999 Mazda 626 ES, 2.5 D, StandardSECTION MPV
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 MAF/IAT sensor 6-pin harness connector. See Fig 1. Using ohmmeter, measure resistance between MAF/IAT sensor terminals "A" and "F", located at each end of connector. See MAF/IAT SENSOR RESISTANCE SPECIFICATIONS (MAZDA6 & MPV)  table. If resistance readings are not as specified, replace MAF/IAT sensor. If IAT sensor is within specification but PID value is out of specification, check for open or short circuit. Go to next step.
    MAF/IAT SENSOR RESISTANCE (MAZDA6 & MPV)

    Temperature - °F (°C) Ohms
    MAZDA6
    -4 (-20) 13,600-18,400
    68 (20) 2210-2690
    140 (60) 493-667
    MPV
    50 (10) 3300-4100
    68 (20) 2200-2700
    86 (30) 1400-1900

  2. Open Circuit Inspection

    Disconnect PCM 104-pin harness connector. Connect 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity between following terminals:
    • MAF/IAT sensor 6-pin harness connector terminal "A" (Brown/Yellow wire) and breakout box terminal No. 91.
    • MAF/IAT sensor 6-pin harness connector terminal "F" (Violet wire) and breakout box terminal No. 39.

    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:
    • MAF/IAT sensor 6-pin harness connector terminal "A" (Brown/Yellow wire) and power supply
    • MAF/IAT sensor 6-pin harness connector terminal "F" (Violet wire) and power supply.
    • MAF/IAT sensor 6-pin harness connector terminal "F" (Violet wire) and ground.

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

Fig 1: Identifying MAF/IAT Sensor 6-Pin Harness Connector
G00143778Courtesy of MAZDA MOTORS CORP.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.