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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Engine Controls Self-Diagnostics - Pathfinder) >> Diagnostic Tests >> DTC P0134: Bank 1 Heated Oxygen Sensor 1 Circuit - No Activity Detected Or DTC P0154: Bank 2 Heated Oxygen Sensor 1 Circuit - No Activity Detected >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Loosen and retighten 2 engine ground bolts. See Figure. Disconnect appropriate HO2S 1 harness connector. See Figure or Figure . Go to next step.
  2. Turn ignition off. Disconnect suspect HO2S 1 4-pin harness connector. Disconnect ECM 116-pin harness connector. ECM is located behind instrument panel lower cover. See Figure. On bank 1 sensor, check continuity of Green wire between HO2S 1 harness connector terminal No. 2 and ECM harness connector terminal No. 35. See Figure and Figure . For bank 2 sensor, check continuity of Green/Black wire between HO2S 1 harness connector terminal No. 2 and ECM harness connector terminal No. 16. Continuity should exist. Check for short to ground and short to voltage between ground and both circuits. If problem is found, repair as necessary. If no problem is 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. On CONSULT-II, select DATA MONITOR mode. Select MANU TRIG, and adjust TRIGGER POINT to 100%. Select HO2S 1 MNTR (B1)/(B2) and HO2S 1 MNTR (B1)/(B2). Hold engine speed at 2000 RPM. Press RECORD. The following should occur:
    • HO2S 1 MNTR (B1)/(B2) changes from RICH to LEAN to RICH 5 times in 10 seconds.
    • HO2S 1 (B1)/(B2) voltage goes above 0.6V at least once.
    • HO2S 1 (B1)/(B2) voltage goes below 0.3V at least once.
    • HO2S 1 (B1)/(B2) voltage never exceeds 1.0V.
    If operation is as specified, go to step  6. If operation is not as specified, replace suspect HO2S 1.
    5. CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  5. Backprobing at ECM, measure voltage between ground and ECM harness connector terminal No. 35 (bank 1) or No. 16 (bank 2). When increase engine speed to 2000 RPM, following should occur:
    • Voltage should cycle from less than 0.3 volt to more than 0.6 volt and back more than 5 times within 10 seconds.
    • Maximum voltage should be more than 0.6 volt at least once.
    • Minimum voltage should be less than 0.3 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 HO2S 1.
  6. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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