AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the air conditioning amplifier assembly is turned ON, a magnet clutch assembly ON signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the A/C COMP relay turns on to operate the magnet clutch assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. INSPECT MAGNET CLUTCH RELAY (A/C COMP)

   
   

   1. Remove the A/C COMP relay from the engine room No. 1 relay block, junction block.

   2. Inspect the A/C COMP relay Click here.

   
   

   NG

   REPLACE MAGNET CLUTCH RELAY (A/C COMP)

   OK

2. INSPECT COOLER COMPRESSOR ASSEMBLY

   
   

   1. 

      for 1GR-FE:

      Remove the cooler compressor assembly Click here.

   2. for 1KD-FTV:

      Remove the cooler compressor assembly Click here.

   3. for 2TR-FE:

      Remove the cooler compressor assembly Click here.

   4. Disconnect the A magnet clutch connector.

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

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

      Result

      Result	Proceed to
      OK	A
      NG (for 1GR-FE)	B
      NG (for 1KD-FTV)	C
      NG (for 2TR-FE)	D

   
   

   B

   REPLACE COOLER COMPRESSOR ASSEMBLY Click here

   C

   REPLACE COOLER COMPRESSOR ASSEMBLY Click here

   D

   REPLACE COOLER COMPRESSOR ASSEMBLY Click here

   A

3. INSPECT MAGNET CLUTCH ASSEMBLY

   
   

   1. 

      Reconnect the A magnet clutch connector.

   2. Apply battery voltage to the magnet clutch assembly and check the operation of the magnet clutch assembly.

      OK
      Measurement Condition Specified Condition Battery positive (+) → Terminal 3 (MG+) Battery negative (-) → Body ground Magnet clutch assembly operating sound can be heard, and magnetic clutch hub and rotor lock.

      Result

      Result	Proceed to
      OK	A
      NG (for 1GR-FE)	B
      NG (for 1KD-FTV)	C
      NG (for 2TR-FE)	D

   
   

   B

   REPLACE MAGNET CLUTCH ASSEMBLY Click here

   C

   REPLACE MAGNET CLUTCH ASSEMBLY Click here

   D

   REPLACE MAGNET CLUTCH ASSEMBLY Click here

   A

4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - BATTERY)

   
   

   1. Remove the A/C COMP relay from the engine room No. 1 relay block, junction block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition A/C COMP relay terminal 1 - Body ground Ignition switch ON 11 to 14 V A/C COMP relay terminal 5 - Body ground Always 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

      Disconnect the G25 amplifier connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition G25-20 (MGC) - Body ground Ignition switch off Below 1 V G25-20 (MGC) - Body ground Ignition switch ON 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

6. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - COOLER COMPRESSOR)

   
   

   1. Remove the A/C COMP relay from the engine room No. 1 relay block, junction block.

   2. Disconnect the C39 compressor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A/C COMP relay terminal 3 - C39-3 (MG+) Always Below 1 Ω C39-3 (MG+) - Body ground Always 10 kΩ or higher

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR