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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

  1. Determining Location Of A Malfunction

    Determine malfunctioning part of CAN system. See PROCEDURES FOR DETERMINING LOCATION OF A MALFUNCTION  under SYSTEM TESTS. See Fig 1. If malfunction is not part of wire harness "E" or instrument cluster, go to next step. If malfunction is part of wire harness "E" or instrument cluster, go to step  6.
    Fig 1: CAN System Wiring Diagram
    G00221530Courtesy of MAZDA MOTORS CORP.

  2. Determining Location Of A Malfunction

    If malfunction is not part of wire harness "D" or ABS/TCS HU/CM, go to next step. If malfunction is part of wire harness "D" or ABS/TCS HU/CM, go to step  12.

  3. Determining Location Of A Malfunction

    If malfunction is not part of wire harness "C", go to next step. If malfunction is part of wire harness "C", go to step  14.

  4. Determining Location Of A Malfunction

    If malfunction is not part of wire harness "B" or TCM, go to next step. If malfunction is part of wire harness "B" or TCM, go to step  17

  5. Determining Location Of A Malfunction

    If malfunction is not part of wire harness "A" or PCM, trouble shooting is completed. If malfunction is part of wire harness "A" or PCM, go to step  19.

  6. Inspect Instrument Cluster Connector

    • Disconnect negative battery cable
    • Disconnect instrument cluster 24-pin harness connector

    If instrument cluster 24-pin harness connector is okay, go to next step. If instrument cluster 24-pin harness connector is faulty, replace wire harness.

  7. If vehicle is equipped with ABS/TCS, go to next step. If vehicle is not equipped with ABS/TCS, go to step  9.

  8. Inspect Wire Harness Between ABS/TCS HU/CM & Instrument Cluster

    Disconnect ABS/TCS HU/CM harness connector. Inspect following wire harness between ABS/TCS HU/CM and instrument cluster harness connector terminals for short to ground, short to power supply, and open circuit:
    • "R" - "2W" (CAN_L)
    • "O" - "2X" (CAN_H)

    If wire harness is okay, replace instrument cluster. After repair, go to step  21. If wire harness is faulty, replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

  9. If inspected vehicle has a automatic transaxle, go to next step. If inspected vehicle has a manual transaxle, go to step  11.

  10. Inspect Wire Harness Between TCM & Instrument Cluster

    Disconnect TCM 24-pin harness connectors. Inspect following wire harness between TCM and instrument cluster harness connector terminals for short to ground, short to power supply, and open circuit:

    JA5A-EL

    • "2J" - "2W" (CAN_L)
    • "2M" - "2X" (CAN_H)

    If wire harness is okay, replace instrument cluster. After repair, go to step  21. If wire harness is faulty, replace wire harness.

  11. Inspect Wire Harness Between PCM & Instrument Cluster

    Disconnect PCM 104-pin harness connector. Inspect following wire harness between PCM and instrument cluster harness connector terminals for short to ground, short to power supply, and open circuit:
    • "49" - "2W" (CAN_L)
    • "50" - "2X" (CAN_H)

    If wire harness is okay, replace instrument cluster. After repair, go to step  21. If wire harness is faulty, replace wire harness.

  12. Inspect ABS/TCS HU/CM Connector

    • Disconnect negative battery cable
    • Disconnect ABS/TCS HU/CM 28-pin harness connector

    If ABS/TCS HU/CM 28-pin harness connector is okay, go to next step. If ABS/TCS HU/CM 28-pin harness connector is faulty, replace wire harness.

  13. Inspect Wire Harness Between ABS/TCS HU/CM & Instrument Cluster

    Disconnect instrument cluster harness connector. Inspect following wire harness between ABS/TCS HU/CM and instrument cluster harness connector terminals for short to ground, short to power supply, and open circuit:
    • "R" - "2W" (CAN_L)
    • "O" - "2X" (CAN_H)

    If wire harness is okay, replace ABS/TCS HU/CM. After repair, go to step  21. If wire harness is faulty, replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

  14. If inspected vehicle has a automatic transaxle, go to next step. If inspected vehicle has a manual transaxle, go to step  16.

  15. Inspect Wire Harness Between TCM & ABS/TCS HU/CM

    Disconnect negative battery cable. Disconnect TCM 24-pin harness connectors. Disconnect ABS/TCS HU/CM 28-pin harness connector. Inspect following wire harness between TCM and ABS/TCS HU/CM harness connector terminals for short to ground, short to power supply, and open circuit:

    JA5A-EL

    • "2J" - "K" (CAN_L)
    • "2M" - "O" (CAN_H)

    If wire harness is okay, go to step  21. If wire harness is faulty, replace wire harness.

  16. Inspect Wire Harness Between PCM & ABS/TCS HU/CM

    Disconnect negative battery cable. Disconnect PCM 104-pin harness connector. Disconnect ABS/TCS HU/CM 28-pin harness connector. Inspect following wire harness between PCM and ABS/TCS HU/CM harness connector terminals for short to ground, short to power supply, and open circuit:
    • "49" - "K" (CAN_L)
    • "50" - "O" (CAN_H)

    If wire harness is okay, go to step  21. If wire harness is faulty, replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

  17. Inspect TCM Connector

    • Disconnect negative battery cable
    • Disconnect TCM 24-pin harness connectors

    If TCM 24-pin harness connectors are okay, go to next step. If TCM 24-pin harness connectors are faulty, replace wire harness.

  18. Inspect Wire Harness Between TCM & Instrument Cluster

    Disconnect instrument cluster 24-pin harness connector. Inspect following wire harness between TCM and instrument cluster harness connector terminals for short to ground, short to power supply, and open circuit:

    JA5A-EL

    • "2J" - "2W" (CAN_L)
    • "2M" - "2X" (CAN_H)

    If wire harness is okay, replace TCM. After repair, go to step  21. If wire harness is faulty, replace wire harness.

  19. Inspect PCM Connector

    • Disconnect negative battery cable.
    • Disconnect PCM 104-pin harness connector.

    If PCM 104-pin harness connector is okay, go to next step. If PCM 104-pin harness connector is faulty, replace wire harness.

  20. Inspect Wire Harness Between PCM & Instrument Cluster

    Disconnect instrument cluster 24-pin harness connector. Inspect following wire harness between PCM and instrument cluster harness connector terminals for short to ground, short to power supply, and open circuit:
    • "49" - "2W" (CAN_L)
    • "50" - "2X" (CAN_H)

    If wire harness is okay, replace PCM. After repair, go to next step. If wire harness is faulty, replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

  21. Check DTC Indicated

    • Connect PCM 104-pin harness connector
    • Connect TCM 24-pin harness connectors
    • Connect ABS/TCS HU/CM 28-pin harness connector
    • Connect instrument cluster 24-pin harness connector
    • Clear DTC from module memory using scan tool
    • Perform KOEO/KOER self-test

    If DTCs U0073, U1900 and/or U2516 are indicated, repeat step  1. If DTCs U0073, U1900 and/or U2516 are not indicated, trouble shooting is completed.

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