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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 Voltage Between Sensor & SIG RTN

    Verify KS is properly installed and electrical connector is connected. Complete COMPREHENSIVE COMPONENT MONITOR REPAIR VERIFICATION DRIVE CYCLE  under MONITOR REPAIR VERIFICATION DRIVE CYCLES. With KOEO, access KSI PID. If KSI PID is less than 0.5 volt, turn ignition off. Go to next step. If KSI PID is 0.5 volt or more, go to step  6 .

  3. Check KS Sensor Resistance

    Disconnect KS connector. Disconnect PCM connector. Install breakout box, leaving PCM disconnected. Measure resistance between breakout box terminals No. 32 and 57. If resistance is 4.39-5.35 megohms, go to step  7 . If resistance is more than 5.35 megohms, go to next step. If resistance is less than 4.39 megohms, go to step  5 .

  4. Check For Open KS(+) Circuit

    Measure resistance of KS(+) circuit between breakout box terminal No. 32 and KS harness connector Dark Green/Violet wire. See Fig 1 . If resistance is less than 5 ohms, replace faulty KS. Go to step  8 . If resistance is 5 ohms or more, repair open circuit. See WIRING DIAGRAMS article. Go to step  8 .
    Fig 1: Identifying KS Harness Connector Terminals
    G00155538Courtesy of MAZDA MOTORS CORP.

  5. Check KS(+) Circuit For Short To Ground In Harness

    Measure resistance of KS(+) circuit between breakout box terminal No. 32 and KS harness connector Dark Green/Violet wire. See Fig 1 . Record reading. Measure resistance of KS(-) circuit between breakout box terminal No. 57 and chassis ground. Record reading. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground. See WIRING DIAGRAMS article. Go to step  8 .

  6. Check KS Circuits For Short To Power In Harness

    Connect PCM to breakout box. With KOEO, measure voltage of KS(+) circuit between breakout box terminal No. 32 and battery negative terminal. If voltage is less than one volt, replace faulty PCM. Go to step  8 . If voltage is one volt or more, repair short circuit. See WIRING DIAGRAMS article. Go to step  8 .

  7. Check PCM For Short To Ground

    Measure resistance between KS(+) and KS(-) circuits at KS harness connector. See Fig 1 . If resistance is more than 10,000 ohms, replace faulty KS. Go to next step. If resistance is 10,000 ohms or less, replace faulty PCM. Go to next step.

  8. Check For Correct PCM Operation

    Disconnect PCM connector. Inspect PCM connector for corrosion and pushed-out pins. Verify PCM connector is properly seated when connected. Operate system and verify problem is still present. If problem is still present, replace faulty PCM. Go to next step. If problem is no longer present, go to next step.

  9. 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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