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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0135, DTC P0141 Or DTC P0155 >> Diagnostic Procedures

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 and KOEO or KOER DTC P0135, P0141 and P0155 were not present, fault may be intermittent. See INTERMITTENT  under SYSTEM TESTS. For other DTCs, go to next step.

  2. Visual Inspection

    Visually inspect suspect HO2S harness for exposed wiring, contamination and corrosion. If harness is okay, go to next step. If harness is not okay, repair as necessary. Go to step  8 .

  3. Check For VPWR At Vehicle Harness Connector

    If DTCs P0135, P0155 or P0141 are displayed, both heater circuits will require testing. DTCs displayed separately are tested individually. Disconnect appropriate HO2S connector. With KOEO, measure voltage between VPWR circuit (DTC P0135, Light Blue/Orange wire) or (DTC P0141 and P0155, Light Blue/Orange wire) and SIG RTN circuit (Orange wire) at suspect HO2S harness connector. See Fig 1 . If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check fuse No. 41 located in engine compartment fuse/relay panel. If fuse is okay, repair open circuit. Go to step  8 . If fuse is not okay, replace fuse. Go to step  8 .
    Fig 1: HO2S Harness Connector Circuit Identification
    G95E35968Courtesy of MAZDA MOTORS CORP.

  4. Check HO2S Heater Resistance

    Turn ignition off. Measure resistance of HO2S connector (component side) heater circuit (DTC P0135, Red/White wire), (DTC P0141, Red/Light Green wire) or (DTC P0155, Yellow/Light Blue wire). If resistance is 3-30 ohms, go to next step. If resistance is not 3-30 ohms, replace faulty HO2S. Go to step  8 .

  5. Check For Heater GND & VPWR Shorted To HO2S Case

    Measure resistance between HO2S heater GND circuit (component side) (DTC P0135, Red/White wire), (DTC P0141, Red/Light Green wire) or (DTC P0155, Yellow/Light Blue wire) and HO2S case. Record reading. Measure resistance between HO2S heater GND circuit (DTC P0135, Red/White wire), (DTC P0141, Red/Light Green wire) or (DTC P0155, Yellow/Light Blue wire) and SIG RTN circuit (Orange wire) at HO2S connector (component side). Record reading. Measure resistance between HO2S VPWR circuit (DTC P0135, DTC P0141 and P0155, Light Blue/Orange wire) and HO2S case. Record reading. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, replace faulty HO2S. Go to step  8 .

  6. Check For Shorts To Other Grounds & VPWR In HO2S Heater Ground Harness Circuits

    Disconnect scan tool from DLC. Install breakout box, leaving PCM disconnected. For DTC P0135, measure resistance between breakout box terminal No. 93 and terminals No. 103, 91 and 71. For DTC P0141, measure resistance between breakout box terminal No. 95 and terminals No. 103, 91 and 71. For DTC P0155, measure resistance between breakout box terminal No. 94 and terminals No. 103, 91 and 71. For all DTCs, if resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit. See WIRING DIAGRAMS article. Go to step  8 .

  7. Check For Open HO2S Heater Ground Harness Circuit

    For DTC P0135, measure resistance between breakout box terminal No. 93 and HO2S harness connector (Red/White wire). For DTC P0141, measure resistance between breakout box terminal No. 95 and HO2S harness connector (Red/Light Green wire). For DTC P0155, measure resistance between breakout box terminal No. 94 and HO2S harness connector (Yellow/Light Blue wire). See Fig 1 . For all DTCs, if resistance is 4 ohms or more, repair open (or excessive resistance) in HO2S heater circuit. See WIRING DIAGRAMS article. Go to next step. If resistance is less than 4 ohms, repair open, shorted (or excessive resistance) in HO2S heater circuit. See WIRING DIAGRAMS article. Replace faulty PCM. Go to next step.

  8. 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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