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Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Mazda Tribute. 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. Verify Related Pending And Stored DTCs

    If no other DTCs are present during PCM Quick Test, go to next step. If any other DTCs are present during PCM Quick Test, go to appropriate trouble shooting procedures. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .

  3. Identify Trigger DTC For FREEZE FRAME DATA

    If DTC P1130 or P1150 are on FREEZE FRAME DATA, go to next step. If DTC P1130 or P1150 are not on FREEZE FRAME DATA, go to trouble shooting procedure for DTC that triggered FREEZE FRAME DATA.
    NOTE: It is necessary to address all Continuous Memory Ignition and Misfire DTCs, if received during Continuous Memory testing, before addressing any KOER HO2S DTCs.

  4. DTCs P1130 & P1150: Fuel System Not Switching At Fuel Trim (RICH Or LEAN)

    Check air cleaner element and air cleaner housing for blockage. Check air intake system for leaks and damage. Verify integrity of PCV system. See POSITIVE CRANKCASE VENTILATION SYSTEM  in SYSTEM TESTS . Check for vacuum leaks. If no intake air system leak or blockage concerns are present, go to next step. If any intake air system leak or blockage concerns are present, repair as necessary. After repair, go to step  16.

  5. Check HO2S Ability To Generate A Voltage Greater Than 0.5 Volt

    Inspect HO2S harness for chafing, burned wiring or other damage and repair as necessary. Disconnect suspect HO2S from vehicle harness. Connect DVOM to HO2S SIG RTN or HO2S GND at HO2S 4-pin connector. See Figure. Run engine at 2000 RPM for 3 minutes. Run KOER self-test and monitor HO2S voltage. Turn ignition off. If voltage reading was more than 0.5 volt during or at end of Self-Test, go to next step. If voltage reading was not as specified, replace HO2S. After repair, go to step  16.

  6. Monitor HO2S (PID) For Proper Switching

    Start engine. Warm up engine to operating temperature. Using scan, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access O2S11 (Front Bank 1) or O2S21 (Front Bank 2) PID and monitor while wiggling, bending and shaking small sections of engine harness from HO2S to PCM. Turn ignition off. If HO2S voltage reading did not stay high (more than 0.45 volt) or low (less than 0.45 volt), go to next step. If HO2S voltage reading stayed high or low, isolate cause of lack of switching and repair as necessary. After repair, go to step  16.
    WARNING: Fuel system is pressurized when engine is not running. To prevent injury or fire, use caution when working on fuel system.
    NOTE: During next step, fuel pump will only operate for approximately 8 seconds when Output Test Mode is selected and activated.

  7. Check Fuel Pressure

    Install fuel pressure gauge. Turn ignition on, engine off. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select ACTIVE COMMAND MODES. Access OUTPUT TEST MODE and run fuel pump to obtain maximum fuel pressure. If fuel pressure is 55-70 psi, go to next step. If fuel pressure is not as specified, refer to FUEL DELIVERY SYSTEM  testing under SYSTEM TESTS .

  8. Check Injector Fault PIDs

    Access INJ1F-INJ6F PIDs. If an injector(s) fault is present, go to next step. If an injector fault is not present, go to step  12.
    NOTE: Performing following procedure erases Continuous Memory DTCs.
    NOTE: Use injector fault PID to determine fuel injector circuit(s) requiring testing.

  9. Check Fuel Injector(s) & Harness Resistance

    Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of suspect fuel injector between suspect INJ circuit breakout box terminal and terminal No. 71 (VPWR). If resistance reading is 11-18 ohms, replace PCM. After repair, go to step  16. If resistance reading is not within specification, go to next step.

  10. Check Fuel Injector Harness Resistance

    Disconnect fuel injector harness connector at suspect fuel injector. Measure resistance of VPWR circuit (Red wire) between breakout box terminal No. 71 and fuel injector harness connector. Measure resistance of INJ circuit between appropriate breakout box terminal and fuel injector harness connector. See Fig 1. If each resistance reading is less than 5 ohms, go to next step. If each resistance reading is not as specified, repair open circuit. See WIRING DIAGRAMS article. After repair, go to step  16.
    Fig 1: Identifying Fuel Injector Circuits & Harness Connector Terminals
    G00158997Courtesy of MAZDA MOTORS CORP.

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

    Measure resistance between suspect INJ circuit breakout box terminal and terminal No. 71 (VPWR). Measure resistance between suspect INJ circuit breakout box terminal and terminal No. 103 (PWR GND). If each resistance reading is more than 10,000 ohms, go to next step. If each resistance reading is not as specified, replace fuel injector(s). After repair, go to step  16.

  12. Flow Test Fuel Injector(s)

    Use a fuel injector tester to flow test fuel injectors according to instructions for tester. Flow rate specification is 17 lb/hr (7.8 kg/hr) for 2.0L engines and 22 lb/hr (10.1 kg/hr) for 3.0L engines. If leakage and flow are within specification, go to next step. If leakage and flow are not within specification, replace fuel injector(s). After repair, go to step  16.

  13. Inspect Induction System For Air Leaks

    Inspect following areas for signs of air leaks:
    • Inlet tube(s) from air cleaner to throttle body.
    • Gaskets which seal upper and lower intake manifold.
    • Vacuum hoses and lines for cracks and proper connections.
    • PCV system.

    If there are no signs of leakage or damage, go to next step. If there are any signs of leaks or damage, repair as necessary. After repair, go to step  16.

  14. Check Cylinder Compression

    Check cylinder compression. Refer to MECHANICAL INSPECTION under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES article. If cylinder compression readings are within specification, go to next step. If cylinder compression readings are not within specification, repair as necessary. After repair, go to step  16.
    NOTE: This step requires an observer to monitor PID for proper operation.

  15. Test Drive While Monitoring HO2S PID For Proper Switching

    Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITTOR AND RECORD. Access O2S11 (Front Bank 1) or O2S21 (Front Bank 2) PID. While observer views PID, test drive vehicle under different road conditions in an attempt to simulate original fault. If HO2S appears to switch properly, unable to duplicate problem. Go to next step. If HO2S does not appear to switch properly, replace HO2S. After repair, go to next step.

  16. Drive Cycle

    Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform HO2S Monitor Drive Cycle. Refer to EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  under MONITOR REPAIR VERIFICATION DRIVE CYCLES. Retrieve pending code. If same DTC present, replace PCM. After repair, go to next step. If same DTC is not present, go to next step.

  17. Verify Trouble Shooting Of DTCs Completed

    Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, trouble shooting is complete.
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