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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2340 (Engine Control System - DTCS U1000 To P0153) >> DTC P0037, P0038, P0057, P0058 Ho2S2 Heater >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten four ground screws on the body.

      Refer to "GROUND INSPECTION ."

      Fig 1: Checking Ground Connections
      G04915248Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  2.

    NG: Repair or replace ground connections.

  2. CHECK HO2S2 HEATER POWER SUPPLY CIRCUIT 
    1. Disconnect heated oxygen sensor 2 harness connector.
      • ← : Vehicle front
      • Oil pan (view from under vehicle) (1)
      • Heated oxygen sensor 2 (bank 1) harness connector (2)
      • Heated oxygen sensor 2 (bank 2) harness connector (3)
      Fig 2: Identifying Oil Pan And Heated Oxygen Sensor 2 Connectors
      G04915275Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Turn ignition switch ON.
    3. Check voltage between HO2S2 terminal 3 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    Fig 3: Checking Voltage Between HO2S2 Terminal 3 And Ground
    G04900172Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  4.

    NG: GO TO  3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M70, F58
    • Fuse block (J/B) connector M4
    • 15A fuse
    • Harness for open or short between heated oxygen sensor 2 and fuse

    >> Repair harness or connectors.

  4. CHECK HO2S2 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal and HO2S2 terminal as follows. Refer to Wiring Diagram.
      ECM TERMINAL AND HO2S2 TERMINAL

      DTC Terminals Bank
      ECM Sensor
      P0037, P0038 25 2 1
      P0057, P0058 6 2 2

      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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