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Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P014F >> DTC P0138, P0158: Ho2S2 >> Component Function Check
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Component Function Check

  1. PERFORM COMPONENT FUNCTION CHECK-I

    ⓧ Without CONSULT 

    1. Perform "INSPECTION MODE 5". Refer to "DESCRIPTION ".
    2. Start engine and warm it up to the normal operating temperature.
    3. Turn ignition switch OFF and wait at least 10 seconds.
    4. Drive the vehicle at speed of 100 km/h (62 MPH) for at least 1 minutes.
      CAUTION: Always drive vehicle at a safe speed.
    5. Stop the vehicle and set selector lever to P position.
    6. Check the voltage between ECM harness connector terminals under the following condition.
      DTC ECM Condition Voltage
      Connector + -
      Terminal Terminal
      P0138 F102 76 84 Revving up to 3, 000 RPM under no load at least 10 times The voltage should be below 0.18 V at least once during this procedure.
      P0158 80

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: GO TO 2.

  2. PERFORM COMPONENT FUNCTION CHECK-II

    Check the voltage between ECM harness connector terminals under the following condition.

    DTC ECM Condition Voltage
    Connector + -
    Terminal Terminal
    P0138 F102 76 84 Keeping engine at idle for 10 minutes The voltage should be below 0.18 V at least once during this procedure.
    P0158 80

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: GO TO 3.

  3. PERFORM COMPONENT FUNCTION CHECK-III

    Check the voltage between ECM harness connector terminals under the following condition.

    DTC ECM Condition Voltage
    Connector + -
    Terminal Terminal
    P0138 F102 76 84 Coasting from 100 km/h (62 MPH) in D position The voltage should be below 0.18 V at least once during this procedure.
    P0158 80

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Go to "DIAGNOSIS PROCEDURE ".