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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1075 (Heater & Air Conditioning Control System (Automatic Air Conditioner)) >> DTC/Circuit Diagnosis >> Magnet Clutch >> Magnet Clutch Diagnosis Procedure >> Diagnostic Procedure For Magnet Clutch

Diagnostic Procedure For Magnet Clutch

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

Fig 1: Magnet Clutch - Circuit Diagram
G05381380Courtesy of NISSAN NORTH AMERICA, INC.
  1. CHECK INTAKE AND AMBIENT SENSOR CIRCUITS

    Check intake and ambient sensors. Refer to "A/C AUTO AMP. SELF- DIAGNOSIS ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO >>

  2. PERFORM AUTO ACTIVE TEST

    Refer to "DIAGNOSIS DESCRIPTION ".

    Does magnet clutch operate? 

    YES >>

    • WITH CONSULT

      GO TO  5.

    • WITHOUT CONSULT

      GO TO  6.

    NO: Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.

  3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R connector and compressor (magnet clutch) connector.
    3. Check continuity between IPDM E/R harness connector E119 terminal 11 and A/C compressor harness connector F3 terminal 1.

      11 - 1: Continuity should exist  .

    4. Check continuity between IPDM E/R harness connector E119 terminal 11 and ground.

      11 - 1: Continuity should not exist  .

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair harness or connector.

  4. CHECK MAGNET CLUTCH CIRCUIT

    Check for operation sound when applying battery voltage direct current to terminal.

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

    NO: Replace magnet clutch. Refer to "REMOVAL AND INSTALLATION FOR COMPRESSOR CLUTCH ".

    Fig 2: Applying Battery Voltage To Compressor Connector Terminal 1
    G04903405Courtesy of NISSAN NORTH AMERICA, INC.
  5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

    Check compressor ON/OFF signal. Refer to "AIR CONDITIONER: CONSULT FUNCTION (BCM - AIR CONDITIONER) ".

    A/C SW ON: AIR COND SW ON 

    A/C SW OFF: AIR COND SW OFF 

    Is the inspection result normal? 

    YES: GO TO  8.

    NO: GO TO 6.

  6. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.
    1. Turn ignition switch OFF.
    2. Disconnect BCM connector and A/C auto amp. connector.
    3. Check continuity between BCM harness connector M18 terminal 27 and A/C auto amp. harness connector M49 terminal 4.

      27 - 4 Continuity should exist  .

    4. Check continuity between BCM harness connector M18 terminal 27 and ground.

      27 - ground Continuity should not exist  .

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair harness or connector.

  7. CHECK VOLTAGE FOR A/C AUTO AMP. (A/C COMPRESSOR ON SIGNAL)
    1. Reconnect BCM connector and A/C auto amp. connector.
    2. Turn ignition switch ON.
    3. Check voltage between A/C auto amp. harness connector M49 terminal 4 and ground.
      Terminals Condition Voltage
      (+) (-)
      A/C auto amp. connector Terminal No.
      M49 4 Ground A/C switch: ON Approx. 0V
      A/C switch: OFF Approx. 5V
      Fig 3: Checking Voltage Between A/C Auto Amp. Harness Connector M49 Terminal 4 And Ground
      G05381384Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 8.

      NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

      NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to "REMOVAL AND INSTALLATION ".

  8. CHECK REFRIGERANT PRESSURE SENSOR
    1. Start engine.
    2. Check voltage between ECM harness connector F54 (VQ40DE) or F79 (VK56DE) terminal 70 and ground.
      Terminals Condition Voltage
      (+) (-)
      ECM connector Terminal No.
      F54 (VQ40DE)
      F79 (VK56DE)      		 70 Ground A/C switch: ON Approx. 0.36 - 3.88V
      Fig 4: Checking Voltage Between ECM Connector F54 (VQ40DE) Or F79 (VK56DE) Terminal 70 And Ground
      G04903409Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 9.

      NO: Refer to "DIAGNOSIS PROCEDURE " (VQ40DE) or "DIAGNOSIS PROCEDURE " (VK56DE).

  9. CHECK BCM INPUT (FAN ON) SIGNAL

    Check FAN ON/OFF signal. Refer to "AIR CONDITIONER: CONSULT FUNCTION (BCM - AIR CONDITIONER) ".

    FRONT BLOWER CONTROL DIAL ON: FAN ON SIG ON 

    FRONT BLOWER CONTROL DIAL OFF: FAN ON SIG OFF 

    Is the inspection result normal? 

    YES: GO TO  12.

    NO: GO TO 10.

  10. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.
    1. Turn ignition switch OFF.
    2. Disconnect BCM connector and A/C auto amp. connector.
    3. Check continuity between BCM harness connector M18 terminal 28 and A/C auto amp. harness connector M49 terminal 5.

      28 - 5 Continuity should exist  .

    4. Check continuity between BCM harness connector M18 terminal 28 and ground.

      28 - ground Continuity should not exist  .

      Is the inspection result normal? 

      YES: GO TO 11.

      NO: Repair harness or connector.

  11. CHECK VOLTAGE FOR A/C AUTO AMP. (FAN ON SIGNAL)
    1. Reconnect BCM connector and A/C auto amp. connector.
    2. Turn ignition switch ON.
    3. Check voltage between A/C auto amp. harness connector M49 terminal 5 and ground.
      Fig 5: Checking Voltage Between A/C Auto Amp. Harness Connector M49 Terminal 5 And Ground
      G05381387Courtesy of NISSAN NORTH AMERICA, INC.
      Terminals Condition Voltage
      (+) (-)
      A/C auto amp. connector Terminal No.
      M49 5 Ground A/C switch: ON
      Blower motor operates      		 Approx. 0V
      A/C switch: OFF Approx. 5V

      Is the inspection result normal? 

      YES: GO TO 12.

      NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

      NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to "REMOVAL AND INSTALLATION ".

  12. CHECK CAN COMMUNICATION

    Check CAN communication. Refer to "TROUBLE DIAGNOSIS FLOW CHART ".

    • BCM - ECM
    • ECM - IPDM E/R
    • ECM - A/C auto amp.

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

    NO: Repair or replace malfunctioning part(s).

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