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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0136, DTC P0156, DTC P1137, DTC P1138, DTC P1157, DTC P1158, DTC P2270, DTC P2271, DTC P2272, Or DTC P2273 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 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 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, P1158, P2270, P2271, P2272 were present during PCM Quick Test, go to next step. If same DTCs 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 DTCs P0136 or P0156 with P1137, P1138, P2270 and/or P2271 or P1157, P1158, P2272 and/or P2273. 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. If none of these possible causes are present, go to next step.
  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 not as specified, repair short in harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. 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 resistance reading is less than 5 ohms, go to next step. If resistance reading is not as specified, repair open in HO2S SIG circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. 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 not as specified, 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 is not as specified, 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 voltage readings are more than 1.5 volts, replace PCM. After repair, go to next step. If voltage readings are not as specified, 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.
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