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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 P1143: Ho2S1 Lean Shift Monitoring - Bank 1 Or DTC P1163: Ho2S1 Lean Shift Monitoring - Bank 2 >> Diagnostic Procedure (2.4L)

Diagnostic Procedure (2.4L)

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 . Loosen and retighten HO2S1 to 30-44 ft. lbs. (40-60 N.m). See Figure . Go to next step.
  2. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step  4 .
  3. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171 or P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or P0172. See DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION  . If 1st trip DTC P0171 or P0172 is not detected and engine is not difficult to start, go to step  5 .
  4. Turn ignition off. Disconnect MAF sensor harness connector. See Figure . Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171 or P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or P0172. See DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION  . If 1st trip DTC P0171 or P0172 is not detected and engine is not difficult to start, go to next step.
  5. Turn ignition off. Disconnect HO2S1 harness connector. Measure resistance between HO2S1 outer terminals. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between each outer HO2S1 terminal and center terminal. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S1.
  6. Reconnect all harness connectors. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step  8 .
  7. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1) and HO2S1 MNTR (B1). Hold engine speed at 2000 RPM. Press RECORD. The following should occur:
    • HO2S1 MNTR (B1) changes from RICH to LEAN to RICH 5 times in 10 seconds.
    • HO2S1 (B1) voltage goes above 0.6V at least once.
    • HO2S1 (B1) voltage goes below 0.3V at least once.
    • HO2S1 (B1) voltage never exceeds 1.0V.

    If operation is as specified, go to step  9 . If operation is not as specified, replace HO2S1.

    8. CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  8. Measure voltage between ground and ECM terminal No. 50 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.

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