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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0133 Or DTC P0153 >> Diagnostic Procedures

Diagnostic Procedures

  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 For Source Of Potential HO2S Contamination

    Investigate following items as potential sources of HO2S contamination:
    • Use of unapproved silicone sealers.
    • Fuel contaminated with silicone additives.
    • Excessive oil burning (i.e., rings, valve seals and/or oil overfill).
    • Engine coolant leaking internally in the engine.
    • Lead contaminated fuel.
    • Short drive cycles in cold weather.
    • Use of unapproved cleaning agents.

    If all of these conditions are not present, go to next step. If any of these conditions are present, repair source of contamination. Replace HO2S and change oil and filter. For HO2S locations see Figure. After repair, go to step  8.

  3. Check For Unmetered Air Leaks

    Fuel calculations can be affected by unmetered air leaks. Carefully inspect the following areas for potential air leaks:
    • Hoses connecting MAF/IAT sensor assembly.
    • Hoses connecting to throttle body.
    • Intake manifold gasket leaks.
    • PCV disconnected.
    • Vacuum lines disconnected.
    • Improperly seated dipstick tube and oil filler cap.
    • Exhaust leaks at flanges and gaskets.

    If no air leaks are present, go to next step. If any air leaks are present, repair source of leak. After repair, go to step  8.

  4. Check HO2S Circuit Wiring With PCM Connected

    Connect scan tool to DLC. Disconnect suspect HO2S 4-pin harness connector. Connect fused jumper wire between HO2S 4-pin harness connector HO2S SIG terminal and VPWR terminal. Turn ignition on, engine off. Access O2S11 for P0133 or O2S21 for P0153 and note voltage reading. If voltage reading is more than 1.50 volts, go to next step. If voltage reading in 1.5 volts or less, remove fused jumper wire and go to step  6.

  5. Check For Short To VPWR And VREF

    Disconnect scan tool from DLC. Turn ignition on, engine off. Measure voltage between suspect HO2S 4-pin harness connector HO2S SIG terminal and SIG RTN terminal. If voltage reading is less than 4.5 volts, replace HO2S and change oil and filter. For HO2S locations see Figure. After repair, go to step  8. If voltage reading is 4.5 volts or less, repair short in VPWR or VREF circuit. See WIRING DIAGRAMS article. After repair, go to step  8.

  6. Check Resistance Of HO2S Signal Circuit

    Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of the HO2S SIG circuit between breakout box terminal No. 60 (DTC P0133) or No. 87 (DTC P0153) and HO2S 4-pin harness connector. See Figure. Record measurement. Measure resistance of SIG RTN circuit (Orange wire) between breakout box terminal No. 91 and HO2S 4-pin harness connector. Record measurement. If each resistance reading is less than 5 ohms, go to next step. If each resistance reading is 5 ohms or more, repair open circuit. See WIRING DIAGRAMS article. After repair, go to step  8.

  7. Check For Short To Ground

    Disconnect scan tool from DLC. For P0133 (Front), measure resistance between breakout box terminals:
    • No. 60 (HO2S SIG) and No. 91 (SIG RTN) for sensor ground.
    • No. 60 (HO2S SIG) and No. 71 (PWR GND).

    For P0153 (Front), measure the resistance between breakout box terminals:

    • No. 87 (HO2S SIG) and No. 91 (SIG RTN) for sensor ground.
    • No. 87 (HO2S SIG) and No. 71 (PWR GND).

    If resistance reading is 10,000 ohms or less, go to next step. If resistances reading is more than 10,000 ohms, replace PCM. After repair, go to next step.

  8. Drive Cycle

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

  9. 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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