LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> LS 460 >> Repair and Diagnosis >> External Pages >> Different car >> Section 740 (Engine Control System - Component Testing) >> Refrigerant Pressure Sensor >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION 
    1. Start engine and warm it up to normal operating temperature.
    2. Turn A/C switch and blower fan switch ON.
    3. Check voltage between ECM terminal 70 and ground with CONSULT-II or tester.

      Voltage: 1.0 - 4.0V 

      4. Fig 1: Checking Voltage Between ECM Terminal 70 And Ground
      G04900823Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  2.

  2. CHECK GROUND CONNECTIONS 
    1. Turn A/C switch and blower fan switch OFF.
    2. Turn ignition switch OFF.
    3. Loosen and retighten four ground screws on the body.

      Refer to "GROUND INSPECTION ."

      Fig 2: Checking Ground Connections
      G04915248Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  3.

    NG: Repair or replace ground connections.

  3. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect refrigerant pressure sensor harness connector.
    2. Turn ignition switch ON.
      Fig 3: Identifying Refrigerant Pressure Sensor Connector And Radiator
      G04915889Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between refrigerant pressure sensor terminal 1 and ground with CONSULT-II or tester.

      Voltage: Approximately 5V 

      4. Fig 4: Checking Voltage Between Refrigerant Pressure Sensor Terminal 1 And Ground
      G04875300Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E131, M92
    • Harness connectors M71, F59
    • Harness for open or short between ECM and refrigerant pressure sensor

      • >> Repair harness or connectors.

  5. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between refrigerant pressure sensor terminal 3 and ECM terminal 67.

      Refer to Wiring Diagram.

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  7.

    NG: GO TO  6.

  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E131, M92
    • Harness connectors M71, F59
    • Harness for open or short between ECM and refrigerant pressure sensor

      • >> Repair open circuit or short to ground or short to power in harness or connectors.

  7. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2.

      Refer to Wiring Diagram.

      Continuity should exist  .

    2. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  9.

    NG: GO TO  8.

  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E131, M92
    • Harness connectors M71, F59
    • Harness for open or short between ECM and refrigerant pressure sensor

      • >> Repair open circuit or short to ground or short to power in harness or connectors.

  9. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ."

    OK or NG 

    OK: Replace refrigerant pressure sensor.

    NG: Repair or replace.

scientia non olet · About LEMON Manuals