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Home >> Nissan-Datsun >> 2008 >> Sentra SL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Control System - DTCS U1000 To P0153 (Qr25DE)) >> DTC P0037, P0038, P0057, P0058 Ho2S2 Heater >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screw on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Body Ground Connections
      G04925810Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK HO2S2 POWER SUPPLY CIRCUIT 
    1. Disconnect heated oxygen sensor 2 harness connector.
      • Heated oxygen sensor 2 (Bank 1) harness connector (1)
      • Heated oxygen sensor 2 (Bank 1) (2)
      • Heated oxygen sensor 2 (Bank 2) (3)
      • Heated oxygen sensor 2 (Bank 2) harness connector (4)
    2. Turn ignition switch ON.
      Fig 2: Identifying Heated Oxygen Sensor 2 Harness Connector
      G04925811Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between HO2S2 terminal 2 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

    Fig 3: Checking Voltage Between HO2S2 Terminal 2 And Ground
    G04874938Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connector E3, F2 (Bank 1)
    • Harness connector E17, F10 (Bank 2)
    • Fuse block (J/B) connector E39 (Bank 2)
    • 10A fuse (Bank 1)
    • 15A fuse (Bank 2)
    • Harness for open or short between heated oxygen sensor 2 and ECM

      : Repair open circuit or short to ground or short to power in harness or connectors.

  4. CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal 13 (Bank 1) or 17 (Bank 2) and HO2S2 terminal 3.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO 5.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK HEATED OXYGEN SENSOR 2 HEATER 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 6.

    NG: Replace malfunctioning heated oxygen sensor 2.

  6. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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