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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0134 : Ho2S1 Circuit No Activity Detected - Bank 1 Or DTC P0154: Ho2S1 Circuit No Activity Detected - Bank 2 >> Diagnostic Procedure (3.3L)

Diagnostic Procedure (3.3L)

WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Loosen and retighten engine ground bolts. See Figure . Disconnect appropriate HO2S1 harness connector. See Figure . Go to next step.
  2. Disconnect ECM harness connector. See Figure or Figure . On bank 1, check continuity of Black wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 50. See Figure . On bank 2, check continuity of Green wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 51. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
  3. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step  5 .
  4. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (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.

    If operation is as specified, go to step  6 . If operation is not as specified, replace HO2S1.

    5. CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  5. Measure voltage between ground and ECM terminal No. 50 (bank 1) or No. 51 (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.

  6. Turn ignition off. Disconnect Gray, 6-pin joint connector No. 2 (connector F32) located near ECM. See Figure or Figure . Check the following:
    • Check continuity between ground and connector F32 terminal No. 1 (Black/Yellow wire).
    • Check continuity between each joint connector terminal (component side).

    Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.

  7. Turn ignition off. Disconnect Gray, 6-pin joint connector No. 2 (connector F32) located near ECM. See Figure or Figure . Check the following:
    • Check continuity between ground and connector F32 terminal No. 1 (Black/Yellow wire).
    • Check continuity between each joint connector terminal (component side).

    Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.

  8. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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