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Home >> Infiniti >> 2008 >> G37 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - G37 Coupe - DTC U0113, U1000, U1001, U1003, U1010, U1011 & U1024; DTC P0011 Through P0223 >> P0037, P0038, P0057, P0058 Ho2S2 Heater >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. CHECK HO2S2 POWER SUPPLY CIRCUIT
    1. Disconnect heated oxygen sensor 2 harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between HO2S2 harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      DTC HO2S2 Ground Voltage
      Bank Connector Terminal
      P0037, P0038 1 F54 2 Ground Battery voltage
      P0057, P0058 2 F53 2

    Is the inspection result normal? 

    YES: GO TO  4.

    NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F1
    • IPDM E/R harness connector E7
    • 15A fuse (No. 46)
    • Harness for open or short between heated oxygen sensor 2 and fuse

      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 the continuity between HO2S2 harness connector and ECM harness connector.
      TERMINALS CONTINUITY REFERENCE

      DTC HO2S2 ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0037, P0038 1 F54 3 F101 17 Existed
      P0057, P0058 2 F53 3 33
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: 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 ".

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. REPLACE HEATED OXYGEN SENSOR 2

    Replace malfunctioning heated oxygen sensor 2.

    CAUTION:
    • Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
    • Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

    INSPECTION END

  7. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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