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Home >> Infiniti >> 2008 >> G35 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0137 Through P0430 >> DTC P0139, P0159: Ho2S2 >> Component Function Check
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Component Function Check

  1. PERFORM COMPONENT FUNCTION CHECK-I

    Without CONSULT-III 

    1. Start engine and warm it up to the normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
    4. Let engine idle for 1 minute.
    5. Check the voltage between ECM harness connector and ground under the following condition.
      VOLTAGE SPECIFICATION

      DTC ECM Ground Condition Voltage
      Connector Terminal
      P0139 F102 76 Ground Revving up to 4, 000 rpm under no load at least 10 times A change of voltage should be more than 0.24V for 1 second during this procedure.
      P0159 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 and ground under the following condition.

    VOLTAGE SPECIFICATION

    DTC ECM Ground Condition Voltage
    Connector Terminal
    P0139 F102 76 Ground Keeping engine at idle for 10 minutes A change of voltage should be more than 0.24V for 1 second during this procedure.
    P0159 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 and ground under the following condition.

    VOLTAGE SPECIFICATION

    DTC ECM Ground Condition Voltage
    Connector Terminal
    P0139 F102 76 Ground Coasting from 80 km/h (50 MPH) in D position (A/T), 4th gear position (M/T) A change of voltage should be more than 0.24V for 1 second during this procedure.
    P0159 80

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Go to "DIAGNOSIS PROCEDURE ".