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VREF terminal circuit inspection

  1. Turn the ignition switch to the ON position.
  2. Measure the voltage between the TP sensor connector (vehicle side) terminal A and body GND using a voltmeter.
    1. Measurement voltage is 0 V.
      1. Turn the ignition switch to the LOCK position.
      2. Disconnect the TP sensor connector, EGR boost sensor (BP), and BARO/MAP sensor (BP WITH TC) connector (to which VREF is applied).
      3. Verify there is no continuity between the TP sensor connector (vehicle side) terminal A and body GND using an ohmmeter.
        • If there is continuity, repair the related harness for short to circuit.
        Fig 1: Identifying TP Sensor Harness Side Connector
        G03637963Courtesy of MAZDA MOTORS CORP.
      4. Inspect for continuity between the PCM connector (vehicle side) terminal 4L and each sensor connector (vehicle side) terminals to which VREF is applied using an ohmmeter.
        • If there is continuity, repair the related harnesses.
      PCM terminal Connector (vehicle side) Terminal
      4L TP sensor A
      EGR boost sensor (BP)
      BARO/MAP sensor (BP WITH TC)      		 C
      Fig 2: Identifying EGR Boost Sensor And TP Sensor Harness Side Connector
      G03637964Courtesy of MAZDA MOTORS CORP.
    2. Measurement voltage is B+.
      1. Turn the ignition switch to the LOCK position.
      2. Disconnect the battery positive harness and battery negative harness.
      3. Verify there is no continuity between the TP sensor connector (vehicle side) terminal A and battery positive harness using an ohmmeter.
        • If there is continuity, repair the related harnesses for short to B+ circuit.
    3. Measurement voltage is approx.5 V.
      • VREF terminal of PCM is okay.
    Fig 3: Identifying TP Sensor Harness Side Connector
    G03637965Courtesy of MAZDA MOTORS CORP.
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