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Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.

  2. Check Injector Fault PIDs

    Using scan tool, access INJ1F through INJ6F PIDs. If an injector(s) fault is present, go to next step. If an injector fault is not present, go to step  6 .
    NOTE: Performing next test step erases Continuous Memory DTCs.

  3. Check Fuel Injector(s) & Harness Resistance

    Turn ignition off. Disconnect PCM connector. Install breakout box, leaving PCM disconnected. Use injector fault PID to determine fuel injector circuit(s) requiring testing. Measure resistance of fuel injector between suspect INJ circuit and breakout box terminal No. 71 (VPWR circuit). See Fig 1 . If resistance is 8.5-15.5 ohms (2.3L and 3.0L) or 11-18 ohms (4.0L), replace faulty PCM. Go to step  6 . If resistance is not 8.5-15.5 ohms (2.3L and 3.0L) or 11-18 ohms (4.0L), go to next step.
    Fig 1: Fuel Injector Harness Connector Circuit Identification
    G00155536Courtesy of MAZDA MOTORS CORP.

  4. Check Fuel Injector Harness Resistance

    Disconnect suspect fuel injector harness connector. Measure resistance of VPWR circuit (Red wire) between breakout box terminal No. 71 and suspect fuel injector harness connector. Record reading. Measure resistance of INJ circuit between appropriate breakout box terminal and suspect fuel injector harness connector. See Fig 1 . Record reading. See INJ CIRCUIT IDENTIFICATION  table. If any resistance reading is less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open harness circuit. See WIRING DIAGRAMS article. Go to step  6 .
    INJ CIRCUIT IDENTIFICATION

    Injector Breakout Box Terminal Wire Color
    Injector 1 No. 75 Tan
    Injector 2 No. 101 White
    Injector 3 No. 74 Brown/Yellow
    Injector 4 No. 100 Brown/Light Blue
    Injector 5 No. 73 Tan/Black
    Injector 6 No. 99 Light Green/Orange

  5. Check Fuel Injector Harness Circuit For Short To Power & Ground

    Measure resistance between suspect INJ circuit breakout box terminal and breakout box terminal No. 71 (VPWR circuit). See Fig 1 . For INJ circuit identification, see INJ CIRCUIT IDENTIFICATION  table. Record reading. Measure resistance between suspect INJ circuit breakout box terminal and breakout box terminal No. 103 (PWR GND circuit). Record reading. If each resistance reading is more than 10,000 ohms, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. Go to next step. If each resistance reading is 10,000 ohms or less, repair short circuit. See WIRING DIAGRAMS article. Go to next step.

  6. Verify Trouble Shooting Of DTCs Completed

    Make sure all electrical connectors are reconnected. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If the same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are present, test is complete.
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