Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch 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

INSPECT COOLER COMPRESSOR ASSEMBLY (MAGNET CLUTCH ASSEMBLY)

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

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1. Use the Data List to check if the magnet clutch on request signal is functioning properly (Toyota Fortuner RM000003PQ5001X.html).
   
   

   ECM

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   A/C Signal	Magnet clutch on request signal / ON or OFF	ON: A/C switch on OFF: A/C switch off	Check this item with the engine idling and the blower switch on (LO level).

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 A38 air conditioning amplifier assembly connector.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A38-13 (MGC) - Body ground	Ignition switch ON	11 to 14 V
   	Ignition switch off	Below 1 V

   Text in Illustration

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

1. Remove the air conditioning amplifier assembly with its connectors still connected (Toyota Fortuner RM000001K3A018X.html).
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   A38-13 (MGC) - Body ground	Engine idling Blower switch on (LO level) A/C switch on (magnet clutch on permitted)	Below 1 V
   	Engine idling Blower switch on (LO level) A/C switch off or on (magnet clutch not on permitted)	11 to 14 V

   Text in Illustration

   *a	Component with harness connected (Air Conditioning Amplifier Assembly)

1. Remove the cooler compressor assembly.
   

   1. for 1KD-FTV: Toyota Fortuner RM0000012JZ028X.html.
      
   2. for 1GR-FE: Toyota Fortuner RM0000012JZ026X.html.
      

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

   OK:

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

   Result

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

1. Disconnect the A2 compressor connector.
   

2. Remove the magnet clutch relay.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   M1-5 - Body ground	Ignition switch ON	11 to 14 V
   	Ignition switch off	Below 1 V

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

   Standard Resistance:

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

1. Disconnect the A38 air conditioning amplifier assembly connector.
   

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

   1. *1: for 1KD-FTV
      
   2. *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
   A38-7 (ACT) - E5-19 (ACT)	Always	Below 1 Ω
   A38-7 (ACT) - Body ground	Always	10 kΩ or higher

   for 1GR-FE:

   Tester Connection	Condition	Specified Condition
   A38-7 (ACT) - E13-25 (ACT)	Always	Below 1 Ω
   A38-7 (ACT) - Body ground	Always	10 kΩ or higher

1. Remove the air conditioning amplifier assembly with its connectors still connected (Toyota Fortuner RM000001K3A018X.html).
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   A38-7 (ACT) - Body ground	Engine idling Blower switch on (LO level) A/C switch on (magnet clutch on)	11 to 14 V
   	Engine idling Blower switch on (LO level) A/C switch off or on (magnet clutch off)	Below 1 V

   Text in Illustration

   *a	Component with harness connected (Air Conditioning Amplifier Assembly)

   Result

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

1. Disconnect the A38 air conditioning amplifier assembly connector.
   

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

   1. *1: for 1KD-FTV
      
   2. *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
   A38-21 (AC1) - E5-18 (AC1)	Always	Below 1 Ω
   A38-21 (AC1) - Body ground	Always	10 kΩ or higher

   for 1GR-FE:

   Tester Connection	Condition	Specified Condition
   A38-21 (AC1) - E13-24 (AC1)	Always	Below 1 Ω
   A38-21 (AC1) - Body ground	Always	10 kΩ or higher

1. Remove the air conditioning amplifier assembly with its connectors still connected (Toyota Fortuner RM000001K3A018X.html).
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   A38-21 (AC1) - Body ground	Engine idling Blower switch on (LO level) A/C switch on	Below 1 V
   	Engine idling Blower switch on (LO level) A/C switch off	11 to 14 V

   Text in Illustration

   *a	Component with harness connected (Air Conditioning Amplifier Assembly)

   Result

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