LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0136, DTC P0156, DTC P1137, DTC P1138, DTC P1157 Or DTC P1158 >> Diagnostic Procedures

Diagnostic Procedures

  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed and Continuous Memory Ignition (P0350-P0354) or Misfire (P0300-P0306) DTCs were received during Continuous Memory Testing, repair those DTCs first. If Continuous Memory DTCs were not present, go to next step.

  2. Check For HO2S KOER

    If DTCs P1137, P1138, P1157 or P1158 were present during PCM Quick Test, go to next step. If DTCs P1137, P1138, P1157 or P1158 were not present, Fault that produced DTC P0136 or P0156 is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS .

  3. Visual Inspection

    Checked for pinched, corroded or stretched wires. Any exhaust leaks between engine and end of catalyst can cause DTC P0136 or P0156 with P1137 and/or P1138 or P1157 and/or P1158. Inspect following:
    • Check for punctures and cracks in catalyst and pipes leading to them.
    • Check exhaust flanges for leaks.
    • Check HO2S torque.

    If any of these possible causes are present, repair as necessary. After repair, go to step  10.

  4. Check HO2S Harness For Short To VPWR & Ground

    Disconnect scan tool from DLC. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Disconnect suspect rear HO2S 4-pin harness connector. Measure resistance between breakout box terminal No. 35 (Bank 1) or terminal No. 60 (Bank 2) and following breakout box terminals:
    • No. 91 (short to SIG RTN)
    • No. 71 (short to VPWR)
    • No. 90 (short to VREF)
    • No. 103 (short to PWR GND)

    If each resistance reading is more than 10,000 ohms, go to next step. If resistance reading is 10,000 ohms or less, repair short in harness. See WIRING DIAGRAMS article. After repair, go to step  10.

  5. Check Resistance Of HO2S SIG & Ground Circuits For Open In Harness

    Measure resistance of HO2S SIG circuit between breakout box terminal No. 35 (Bank 1) or terminal No. 60 (Bank 2) and HO2S 4-pin harness connector. Record reading. Measure resistance of HO2S SIG RTN circuit between breakout box terminal No. 91 and HO2S 4-pin harness connector. See Figure and Figure . Record reading. If both resistance readings are less than 5 ohms, go to next step. If either resistance reading is 5 ohms or more, repair open HO2S SIG circuit. See WIRING DIAGRAMS article. After repair, go to step  10.

  6. Check HO2S Circuit Voltage

    Remove Breakout Box. Reconnect PCM 104-pin harness connector and rear HO2S 4-pin harness connector. Reconnect scan tool to DLC. Turn ignition on, engine off. Access O2S12 PID (Bank 1) or O2S22 PID (Bank 2) and record reading. If voltage reading was 1.5 volts or less, go to next step. If voltage reading was more than 1.5 volts, go to step  9.

  7. Check Resistance Of HO2S Ground Circuit In PCM

    Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM only, leave harness connector disconnected. See Figure. Measure resistance between breakout box terminals No. 91 (SIG RTN) and No. 103 (PWR GND). If resistance reading is less than 5 ohms, go to next step. If resistance reading is 5 ohms or more, replace PCM. After repair, go to step  10.

  8. Apply 12 Volts To Suspect HO2S Circuit

    Remove Breakout Box. Reconnect PCM 104-pin harness connector to PCM. Disconnect suspect rear HO2S 4-pin harness connector. Connect fused jumper wire between HO2S 4-pin harness connector VPWR terminal (Light Blue/Orange wire) and HO2S SIG terminal. Turn ignition on, engine off. Access O2S12 PID (Bank 1) or O2S22 PID (Bank 2) and monitor. If PID reading is more than 1.5 volts, replace rear HO2S. After repair, go to step  10. If PID reading in 1.5 volts or less, replace PCM. After repair, go to step  10.

  9. Check For Over Voltage On HO2S Circuit In PCM

    Turn ignition on, engine off. Disconnect suspect rear HO2S 4-pin harness connector. Measure voltage between HO2S 4-pin harness connector SIG RTN terminal (Orange wire) and negative battery terminal. Record reading. Measure voltage between HO2S 4-pin harness connector HO2S SIG terminal and negative battery terminal. If either voltage reading is more than 1.5 volts, replace PCM. After repair, go to next step. If either voltage reading is 1.5 volts or less, replace rear HO2S. After repair, go to next step.

  10. Verify Trouble Shooting Of DTCs Completed

    Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, procedure is complete.
scientia non olet · About LEMON Manuals