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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE) >> Diagnostic Tests >> DTC P0134 Or DTC P0154 >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit wiring diagram, see Figure or Figure . For connector identification and locations, see CONNECTOR IDENTIFICATION  .

  1. Retighten Ground Screws

    Turn ignition off. Loosen and retighten engine ground screws. See Figure . Go to next step.

  2. Check Input Signal Circuit

    Disconnect appropriate HO2S1 harness connector. See Figure . Disconnect ECM harness connector. See Figure . Check continuity between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 94 (on bank 1) or No. 62 (on bank 2). See Figure or Figure . Continuity should exist. Also, check harness for short to ground and short to power. If problem is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, go to next step.

  3. Check Ground Circuit

    Check continuity between engine ground and HO2S1 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check harness for short to power. If problem is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, go to next step.

  4. Check HO2S1

    Reconnect all harness connectors. Start engine and warm to normal operating temperature.

    With CONSULT-II

    1. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 (B1)/(B2) and HO2S1 MNTR (B1)/(B2). Hold engine speed at 2000 RPM. Press RECORD. The following should occur:
      • HO2S1 MNTR (B1)/(B2) changes from RICH to LEAN to RICH 5 times in 10 seconds.
      • HO2S1 (B1)/(B2) voltage goes above 0.6V at least once.
      • HO2S1 (B1)/(B2) voltage goes below 0.3V at least once.
      • HO2S1 (B1)/(B2) voltage never exceeds 1.0V.

    Without CONSULT-II

    1. Measure voltage between ground and ECM terminal No. 94 (bank 1) or No. 62 (bank 2) by backprobing. Increase engine speed to 2000 RPM. The following should occur:
      • Voltage should cycle from less than .3 volt to more than .6 volt and back more than 5 times within 10 seconds.
      • Maximum voltage should be more than .6 volt at least once.
      • Minimum voltage should be less than .3 volt at least once.
      • Voltage should never exceed one volt.

    If operation is as specified, go to next step. If operation is not as specified, replace HO2S1. Perform DTC CONFIRMATION TEST  to verify repair.

  5. Check For Intermittent

    Check for intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. Perform DTC CONFIRMATION TEST  to verify repair.
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