Air Conditioning System Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

READ VALUE USING INTELLIGENT TESTER

INSPECT FUSE (A/C NO. 2)

INSPECT RELAY (MGC)

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

INSPECT AIR CONDITIONING AMPLIFIER

INSPECT A/C COMPRESSOR

INSPECT MAGNETIC CLUTCH

CHECK HARNESS AND CONNECTOR (ENGINE ROOM R/B AND J/B - BATTERY)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to the ON position and turn the intelligent tester main switch on.
   

3. Turn the A/C switch on and off.
   

4. Select the item below in the Data List, and read the display on the intelligent tester.
   
   

   Data List / Engine:

   Item	Measure Item	Normal Condition	Diagnostic Note
   A/C Signal (A/C Signal)	A/C signal / ON or OFF	ON: A/C ON OFF: A/C OFF	-

   OK:

   The display is as specified in the normal condition column.
   

1. Remove the A/C No. 2 fuse from the instrument panel J/B.
   

2. Measure the resistance of the fuse.
   

   Standard resistance:

   Tester Item	Condition	Specified Condition
   A/C No. 2 fuse	Always	Below 1 Ω

3. Reconnect the A/C No. 2 fuse to the instrument panel J/B.
   

1. Remove the MGC relay from the engine room R/B and J/B.
   

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)

3. Install the MGC relay to the engine room R/B and J/B.
   

1. Disconnect the connector from the A/C amplifier.
   

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

   Standard voltage:

   Tester Connection (Symbols)	Condition	Specified Condition
   E38-20 (MGC) - Body ground	Ignition switch: LOCK	Below 1 V
   E38-20 (MGC) - Body ground	Ignition switch: ON	10 to 14 V

1. Reconnect the connector to the A/C amplifier.
   

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

   Standard voltage:

   Tester Connection (Symbols)	Condition	Specified Condition
   E38-20 (MGC) - Body ground	Ignition switch: ON A/C switch: OFF	10 to 14 V
   E38-20 (MGC) - Body ground	Ignition switch: ON A/C switch: ON	Below 1 V

1. Disconnect the connector from the A/C compressor.
   

2. Disconnect the connector from the magnetic clutch.
   

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

   Standard resistance:

   Tester Connection (Symbols)	Condition	Specified Condition
   C53-3 (MG+) - A-1	Always	Below 1 Ω
   C53-3 (MG+) - Body ground	Always	10 kΩ or higher

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   A-1 - Body ground	Always	3.4 to 3.8 Ω

2. When connector terminal A1 is connected to the positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch's operating sound can be heard, and 2) the magnetic clutch's hub and rotor lock.
   

1. Remove the MGC relay from the engine room R/B and J/B.
   

2. Turn the ignition switch to the ON position.
   

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

   Standard voltage:

   Tester Connection	Specified Condition
   Relay block MGC relay terminal 5 - Body ground	10 to 14 V
   Relay block MGC relay terminal 1 - Body ground	10 to 14 V