Air Conditioning System (For Automatic Air Conditioning System) Compressor Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (A/C Signal)

INSPECT MAGNET CLUTCH RELAY

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (MGC VOLTAGE)

INSPECT COOLER COMPRESSOR ASSEMBLY (MAGNET CLUTCH ASSEMBLY)

CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY - MAGNET CLUTCH RELAY)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (AC1 VOLTAGE)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (ACT VOLTAGE)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Use the Data List to check if the A/C system is functioning properly.
   
   

   ECM

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   A/C Signal	A/C signal / ON or OFF	ON: A/C ON OFF: A/C OFF	-

OK:

Display is as specified in normal condition.

1. Remove the magnet clutch relay.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   3 - 5	Battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
   	Battery voltage is applied to terminals 1 and 2	Below 1 Ω

1. Disconnect the A16 amplifier connector.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A16-13 (MGC) - Body ground	Ignition switch ON	11 to 14 V

1. Remove the air conditioning amplifier with its connectors still connected.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A16-13 (MGC) - Body ground	Ignition switch START A/C switch ON	Below 1 V
   	Ignition switch START A/C switch OFF	11 to 14 V

1. Disconnect the clutch connector.
   

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

   OK:

   Measurement Connection	Specified Condition
   Battery positive (+) → Terminal 1 Battery negative (-) → Ground wire	Magnet clutch engages

1. Disconnect the A2 compressor connector.
   

2. Remove the magnet clutch relay.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A2-1 - M1-3	Always	Below 1 Ω

1. Disconnect the A16 amplifier connector.
   

2. Disconnect the E5*1 or E13*2 ECM connector.
   

   1. *1: for 1KD-FTV
      
   1. *2: for 1GR-FE
      

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

   Standard Resistance:

   for 1KD-FTV

   Tester Connection	Condition	Specified Condition
   A16-21 (AC1) - E5-18 (AC1)	Always	Below 1 Ω
   A16-7 (ACT) - E5-19 (ACT)

   for 1GR-FE

   Tester Connection	Condition	Specified Condition
   A16-21 (AC1) - E13-24 (AC1)	Always	Below 1 Ω
   A16-7 (ACT) - E13-25 (ACT)

1. Remove the air conditioning amplifier with its connectors still connected.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A16-21 (AC1) - Body ground	Ignition switch START A/C switch AUTO Magnet clutch is engaged	Below 1 V
   	Ignition switch START A/C switch AUTO Magnet clutch is not engaged	11 to 14 V

1. Remove the air conditioning amplifier with its connectors still connected.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A16-7 (ACT) - Body ground	Ignition switch START A/C switch AUTO	11 to 14 V