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Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater & Air Conditioning Control System (Automatic Air Conditioning) >> DTC/Circuit Diagnosis >> ECV (Electrical Control Valve) >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE 

    Check 10A fuse [No. 3, located in the fuse block (J/B)].

    NOTE: Refer to "FUSE, CONNECTOR AND TERMINAL ARRANGEMENT ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Replace the fuse after repairing the applicable circuit.

  2. CHECK ECV POWER SUPPLY CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Disconnect the ECV connector.
    3. Turn the ignition switch ON.
    4. Check voltage between the ECV harness connector and ground.
      (+) (-) Voltage
      ECV -
      Connector Terminal
      F44 2 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair the harnesses or connectors.

  3. CHECK ECV CONTROL SIGNAL 
    1. Turn the ignition switch OFF.
    2. Connect the ECV connector.
    3. Perform the self-diagnosis STEP-4 (Code No. 45). Refer to "WITHOUT ACCS: DIAGNOSIS DESCRIPTION " (WITHOUT ACCS) or "WITH ACCS: DIAGNOSIS DESCRIPTION " (WITH ACCS).
    4. Check output waveform between the unified meter and A/C amp. harness connector and ground with the oscilloscope.
      (+) (-) Condition Output waveform
      Unified meter and A/C amp. -
      Connector Terminal
      M67 65 Ground
      • Ignition switch ON
      • Self-diagnosis. STEP-4 (Code No. 45)
      G05221701

      Is the inspection result normal? 

      YES: Replace the compressor.

      NO: GO TO 4.

  4. CHECK CONTINUITY BETWEEN ECV AND UNIFIED METER AND A/C AMP. 
    1. Turn the ignition switch OFF.
    2. Disconnect the ECV connector.
    3. Disconnect the unified meter and A/C amp. connector.
    4. Check continuity between the ECV harness connector and unified meter and A/C amp. harness connector.
      ECV Unified meter and A/C amp. Continuity
      Connector Terminal Connector Terminal
      F44 3 M67 65 Existed
    5. Check for continuity between the ECV harness connector and ground.
      ECV - Continuity
      Connector Terminal
      F44 3 Ground Not existed

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair the harnesses or connectors.

  5. CHECK ECV 

    Check continuity between the ECV connector terminals.

    ECV Continuity
    Terminal Terminal
    2 3 Existed

    Is the inspection result normal? 

    YES: Replace the unified meter and A/C amp.

    NO: Replace the compressor.

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