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Home › Mazda › 2002 › MPV ES › Repair and Diagnosis › Engine Performance › System › Engine Controls - System & Component Testing › Engine Sensors & Switches › Heated Oxygen Sensor › 626 2.5L (Using New Generation Star Scan Tool)

626 2.5L (Using New Generation Star Scan Tool)

  1. Warm engine to normal operating temperature. Connect New Generation Star (NGS) scan tool to DLC-2. DLC-2 is located under left side of instrument panel, right of steering column. Access DIAGNOSTIC DATA LINK menu, and select PCM. Select PID/DATA MONITOR AND RECORD.

  2. Voltage Inspection

    Turn ignition switch on. Select O2S11 (right front), O2S21 (left front), O2S12 (right rear) or O2S22 (left rear) PIDs to be checked and note voltage reading. See HO2S VOLTAGE (626 2.5L)  table. If voltage is not as specified, check wiring harness and connectors between PCM and HO2S. Also check intake-air system, fuel system and self-diagnostic system. Repair as necessary. If system or wiring harness problems are not present, replace HO2S.

  3. HO2S Heater Resistance Inspection

    Disconnect HO2S 4-pin connector. Using ohmmeter, measure resistance between HO2S 4-pin connector terminals "C" and "D". See Figure . See HO2S HEATER RESISTANCE SPECIFICATION (626 2.5L)  table. If resistance is not as specified, replace HO2S. If resistance readings are within specification, check related wiring harness and connectors.
    HO2S HEATER RESISTANCE SPECIFICATION (626 2.5L)

    Sensor Ohms
    Right & Left Front About 3.3
    Right & Left Rear About 6
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