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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0139: Ho2S2 Circuit Slow Response - Bank 1 Or DTC P0159: Ho2S2 Circuit Slow Response - Bank 2 >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. 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 . Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step  3 .
  2. 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, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See DTC P0171: FUEL INJECTION SYSTEM TOO LEAN - BANK 1, DTC P0172: FUEL INJECTION SYSTEM TOO RICH - BANK 1, DTC P0174: FUEL INJECTION SYSTEM TOO LEAN - BANK 2OR DTC P0175: FUEL INJECTION SYSTEM TOO RICH - BANK 2  . If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to step  4 .
  3. 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, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See DTC P0171: FUEL INJECTION SYSTEM TOO LEAN - BANK 1, DTC P0172: FUEL INJECTION SYSTEM TOO RICH - BANK 1, DTC P0174: FUEL INJECTION SYSTEM TOO LEAN - BANK 2OR DTC P0175: FUEL INJECTION SYSTEM TOO RICH - BANK 2  . If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to next step.
  4. Turn ignition off. Disconnect appropriate HO2S2 harness connector. See Figure . Disconnect ECM harness connector. See Figure . On bank 1, check continuity of White wire between HO2S2 harness connector terminal No. 1 and ECM harness connector terminal No. 88. See Figure . On bank 2, check continuity of White wire between HO2S2 harness connector terminal No. 1 and ECM harness connector terminal No. 90. 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.
  5. Check continuity between engine ground and HO2S2 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step  7 .
  6. Check the following:
    • Check Blue, 12-pin joint connector No. 18 (connector F46) located near ECM. See Figure . See Figure or Figure .
    • Check for open or short between HO2S2 and engine ground.

    Repair as necessary.

  7. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step  9 .
  8. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1)/(B2) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1)/(B2) voltage should be more than .63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1)/(B2) voltage should be less than .48 volt at least once. If operation is as specified, go to step  11 . If operation is not as specified, replace HO2S2.
  9. Measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than .63 volt at least once. If voltage is as specified, go to step  11 . If voltage is not as specified, go to next step.
  10. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than .48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
  11. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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