AIR CONDITIONING SYSTEM Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MG/CLT relay turns on to operate the magnetic clutch.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to CAN DTC is not output A CAN DTC is output B

   
   
   • AClick here
   • BClick here
2. Click here

   INSPECT RELAY (MG/CLT)

   
   
   1. 

      Remove the MG/CLT relay from the engine room relay block and junction block.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Specified Condition 3 - 5 10 kΩ or higher 3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - BATTERY)

   
   
   1. 

      Remove the MG/CLT relay from the engine room relay block and junction block.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition Relay block MG/CLT relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V

      Table 1. Text in Illustration

      *1	Component without relay installed (Engine Room Relay Block and Junction Block)

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)

   
   
   1. 

      Disconnect the A/C amplifier connector.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition F50-20 (MGC) - Body ground Engine switch off Below 1 V F50-20 (MGC) - Body ground Engine switch on (IG) 11 to 14 V

      Table 2. Text in Illustration

      *1	Front view of wire harness connector (to A/C Amplifier)

   
   
   • OKClick here
   • NGClick here
5. Click here

   INSPECT A/C AMPLIFIER

   
   
   1. 

      Reconnect the A/C amplifier connector.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition F50-20 (MGC) - Body ground Engine switch on (IG) A/C switch: off 11 to 14 V F50-20 (MGC) - Body ground Engine switch on (IG) A/C switch: on Below 1 V

      Table 3. Text in Illustration

      *1	Component with harness connected (A/C Amplifier)

   
   
   • OKClick here
   • NGClick here
6. Click here

   INSPECT A/C COMPRESSOR

   
   
   1. 

      Disconnect the A/C compressor connector.

   2. 

      Disconnect the magnetic clutch connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition D7-3 (MG+) - d17-1 Always Below 1 Ω D7-3 (MG+) - Body ground Always 10 kΩ or higher

      Table 4. Text in Illustration

      *1	Component without harness connected (A/C Compressor)
      *2	Component without harness connected (Magnetic Clutch)

   
   
   • OKClick here
   • NGClick here
7. Click here

   INSPECT MAGNETIC CLUTCH

   
   
   1. 

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition d17-1 - Body ground 20°C (68°F) 3.8 to 4.2 Ω

   2. When connector terminal d17-1 is connected to a positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch operating sound can be heard, and 2) the magnetic clutch hub and rotor lock.

      Table 5. Text in Illustration

      *1	Component without harness connected (Magnetic Clutch)

   
   
   • OKClick here
   • NGClick here
8. Click here

   CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - BATTERY)

   
   
   1. 

      Remove the MG/CLT relay from the engine room relay block and junction block.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition Relay block MG/CLT relay terminal 5 - Body ground Engine switch on (IG) 11 to 14 V

      Table 6. Text in Illustration

      *1	Component without relay installed (Engine Room Relay Block and Junction Block

   
   
   • OKClick here
   • NGClick here
9. Click here

   CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - A/C COMPRESSOR)

   
   
   1. 

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Relay block MG/CLT relay terminal 3 - D7-3 (MG+) Always Below 1 Ω D7-3 (MG+) - Body ground Always 10 kΩ or higher

      Result
      Result Proceed to NG A OK (When troubleshooting according to Problem Symptoms Table) B OK (When troubleshooting according to the DTC) C

      Table 7. Text in Illustration

      *1	Component without relay installed (Engine Room Relay Block and Junction Block)
      *2	Front view of wire harness connector (to A/C Compressor)

   
   
   • AClick here
   • BClick here
   • CClick here
10. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

11. Click here

    REPLACE RELAY (MG/CLT)

12. Click here

    REPLACE A/C COMPRESSORClick here

13. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

14. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

15. Click here

    GO TO CAN COMMUNICATION SYSTEMClick here

16. Click here

    REPLACE MAGNETIC CLUTCHClick here

17. Click here

    REPLACE A/C AMPLIFIERClick here

18. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR