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Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Control System - DTCS U0101 Through P0153) >> DTC P0037, P0038, P0057, P0058: Ho2S2 Heater >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.
  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 HEATED OXYGEN SENSOR 2 (HO2S2) POWER SUPPLY CIRCUIT 
    1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between HO2S2 harness connector and ground.
      DTC HO2S2 Ground Voltage
      Bank Connector Terminal
      P0037, P0038 1 F87 2 Ground Battery voltage
      P0057, P0058 2 F88 2

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F10
    • IPDM E/R harness connector E7
    • 15 A fuse (No. 46)
    • Harness for open or short between heated oxygen sensor 2 and fuse

      : Repair open circuit, 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.
      DTC HO2S2 ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0037, P0038 1 F87 3 F111 56 Existed
      P0057, P0058 2 F88 3 55
    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, short to ground or short to power in harness or connectors.

  5. CHECK HO2S2 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. Refer to "EXPLODED VIEW ".

    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 [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).

    : INSPECTION END

  7. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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