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

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (A/C SWITCH SIGNAL)

INSPECT MAGNET CLUTCH RELAY (MG CLT)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

CHECK COOLER COMPRESSOR ASSEMBLY

INSPECT MAGNET CLUTCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH RELAY - BATTERY)

CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER ASSEMBLY)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER ASSEMBLY)

CHECK ECM

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 magnet clutch relay turns on to operate the magnet clutch assembly.

WIRING DIAGRAM


w/ Rear Heater:

Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit


w/o Rear Heater:

Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. Since the air conditioning system has functions that use CAN communication system, first confirm that there is no malfunction in the communication system by inspecting the CAN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure (Click here).
1.READ VALUE USING GTS (A/C SWITCH SIGNAL)

  1. Use the Data List to check if the A/C switch is functioning properly (Click here).

    Engine
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    A/C Signal
    		A/C switch signal / ON or OFF
    		ON: A/C switch on
    OFF: A/C switch off
    		-
    OK:
    The display is as specified in the normal condition.


NG
Go to step 10
OK


2.INSPECT MAGNET CLUTCH RELAY (MG CLT)

  1. Remove the MG CLT relay from the No. 1 engine room relay block.

  1. Inspect the MG CLT relay (Click here).



NG
REPLACE MAGNET CLUTCH RELAY (Click here)
OK


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


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

  1. w/ Rear Heater:

    1. Disconnect the 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
      E36-18 (MGC) - Body ground
      		Ignition switch off
      		Below 1 V
      E36-18 (MGC) - Body ground
      		Ignition switch ON
      		11 to 14 V


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

  1. w/o Rear Heater:

    1. Disconnect the 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
      E81-20 (MGC) - Body ground
      		Ignition switch off
      		Below 1 V
      E81-20 (MGC) - Body ground
      		Ignition switch ON
      		11 to 14 V
Text in Illustration
*a
Rear view of wire harness connector
(to Air Conditioning Amplifier Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

  1. w/ Rear Heater:

    1. Reconnect the 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
      E36-18 (MGC) - Body ground
      1. Engine idling
      2. A/C switch off
      3. Blower switch LO
      		11 to 14 V
      E36-18 (MGC) - Body ground
      1. Engine idling
      2. A/C switch on
      3. Blower switch LO
      		Below 1 V


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

  1. w/ Rear Heater:

    1. Reconnect the 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
      E81-20 (MGC) - Body ground
      1. Engine idling
      2. A/C switch off
      3. Blower switch LO
      		11 to 14 V
      E81-20 (MGC) - Body ground
      1. Engine idling
      2. A/C switch on
      3. Blower switch LO
      		Below 1 V
Text in Illustration
*a
Component with harness connected
(Air Conditioning Amplifier Assembly)


NG
Go to step 8
OK


5.CHECK COOLER COMPRESSOR ASSEMBLY

  1. Disconnect the C30 cooler compressor assembly connector.

  1. Disconnect the magnet clutch assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C30-3 (MG+) - 1
    		Always
    		Below 1 Ω
    C30-3 (MG+) or 1 -Body ground
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for 1VD-FTV)
    		B
    NG (for 1GR-FE)
    		C
    NG (for 1UR-FE)
    		D
    NG (for 3UR-FE)
    		E


B
REPLACE COOLER COMPRESSOR ASSEMBLY (Click here)

C
REPLACE COOLER COMPRESSOR ASSEMBLY (Click here)

D
REPLACE COOLER COMPRESSOR ASSEMBLY (Click here)

E
REPLACE COOLER COMPRESSOR ASSEMBLY (Click here)
A


6.INSPECT MAGNET CLUTCH ASSEMBLY

  1. Remove the magnet clutch assembly.

    1. for 1VD-FTV: Click here
    2. for 1GR-FE: Click here
    3. for 1UR-FE: Click here
    4. for 3UR-FE: Click here

  1. Inspect the magnet clutch assembly.

    1. for 1VD-FTV: Click here
    2. for 1GR-FE: Click here
    3. for 1UR-FE: Click here
    4. for 3UR-FE: Click here
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for 1VD-FTV)
    		B
    NG (for 1GR-FE)
    		C
    NG (for 1UR-FE)
    		D
    NG (for 3UR-FE)
    		E


B
REPLACE MAGNET CLUTCH ASSEMBLY (Click here)

C
REPLACE MAGNET CLUTCH ASSEMBLY (Click here)

D
REPLACE MAGNET CLUTCH ASSEMBLY (Click here)

E
REPLACE MAGNET CLUTCH ASSEMBLY (Click here)
A


7.CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH RELAY - BATTERY)

  1. Remove the MG CLT relay from the No. 1 engine room relay block.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    Relay block MG CLT relay terminal 5 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Relay block MG CLT relay terminal 1 - Body ground
    		Ignition switch ON
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

8.CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER ASSEMBLY)
  1. *1: for LHD
  2. *2: for RHD

  1. w/ Rear Heater:

    1. Disconnect the A38*1 or A52*2 ECM connector.

    2. Disconnect the E36 air conditioning amplifier assembly connector.

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

      Standard Resistance:
      for 1VD-FTV:
      Tester Connection
      		Condition
      		Specified Condition
      A38-18 (ACT) - E36-22 (ACT)*1
      		Always
      		Below 1 Ω
      A38-30 (AC1) - E36-11 (AC1)*1
      		Always
      		Below 1 Ω
      A52-18 (ACT) - E36-22 (ACT)*2
      		Always
      		Below 1 Ω
      A52-30 (AC1) - E36-11 (AC1)*2
      		Always
      		Below 1 Ω
      A38-18 (ACT) or E36-22 (ACT) - Body ground*1
      		Always
      		 10 kΩ or higher
      A38-30 (AC1) or E36-11 (AC1) - Body ground*1
      		Always
      		 10 kΩ or higher
      A52-18 (ACT) or E36-22 (ACT) - Body ground*2
      		Always
      		 10 kΩ or higher
      A52-30 (AC1) or E36-11 (AC1) - Body ground*2
      		Always
      		 10 kΩ or higher
      for 1GR-FE, 1UR-FE:
      Tester Connection
      		Condition
      		Specified Condition
      A38-17 (ACT) - E36-22 (ACT)*1
      		Always
      		Below 1 Ω
      A38-19 (AC1) - E36-11 (AC1)*1
      		Always
      		Below 1 Ω
      A52-17 (ACT) - E36-22 (ACT)*2
      		Always
      		Below 1 Ω
      A52-19 (AC1) - E36-11 (AC1)*2
      		Always
      		Below 1 Ω
      A38-17 (ACT) or E36-22 (ACT) - Body ground*1
      		Always
      		 10 kΩ or higher
      A38-19 (AC1) or E36-11 (AC1) - Body ground*1
      		Always
      		 10 kΩ or higher
      A52-17 (ACT) or E36-22 (ACT) - Body ground*2
      		Always
      		 10 kΩ or higher
      A52-19 (AC1) or E36-11 (AC1) - Body ground*2
      		Always
      		 10 kΩ or higher
      for 3UR-FE:
      Tester Connection
      		Condition
      		Specified Condition
      A38-17 (ACT) - E36-22 (ACT)
      		Always
      		Below 1 Ω
      A38-9 (AC1) - E36-11 (AC1)
      		Always
      		Below 1 Ω
      A38-17 (ACT) or E36-22 (ACT) - Body ground
      		Always
      		 10 kΩ or higher
      A38-9 (AC1) or E36-11 (AC1) - Body ground
      		Always
      		 10 kΩ or higher

  1. w/o Rear Heater:

    1. Disconnect the A38*1 or A52*2 ECM connector.

    2. Disconnect the E81 air conditioning amplifier assembly connector.

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

      Standard Resistance:
      for 1VD-FTV:
      Tester Connection
      		Condition
      		Specified Condition
      A38-18 (ACT) - E81-27 (ACT)*1
      		Always
      		Below 1 Ω
      A38-30 (AC1) - E81-23 (AC1)*1
      		Always
      		Below 1 Ω
      A52-18 (ACT) - E81-27 (ACT)*2
      		Always
      		Below 1 Ω
      A52-30 (AC1) - E81-23 (AC1)*2
      		Always
      		Below 1 Ω
      A38-18 (ACT) or E81-27 (ACT) - Body ground*1
      		Always
      		 10 kΩ or higher
      A38-30 (AC1) or E81-23 (AC1) - Body ground*1
      		Always
      		 10 kΩ or higher
      A52-18 (ACT) or E81-27 (ACT) - Body ground*2
      		Always
      		 10 kΩ or higher
      A52-30 (AC1) or E81-23 (AC1) - Body ground*2
      		Always
      		 10 kΩ or higher
      for 1GR-FE, 1UR-FE:
      Tester Connection
      		Condition
      		Specified Condition
      A38-17 (ACT) - E81-27 (ACT)*1
      		Always
      		Below 1 Ω
      A38-19 (AC1) - E81-23 (AC1)*1
      		Always
      		Below 1 Ω
      A52-17 (ACT) - E81-27 (ACT)*2
      		Always
      		Below 1 Ω
      A52-19 (AC1) - E81-23 (AC1)*2
      		Always
      		Below 1 Ω
      A38-17 (ACT) or E81-27 (ACT) - Body ground*1
      		Always
      		 10 kΩ or higher
      A38-19 (AC1) or E81-23 (AC1) - Body ground*1
      		Always
      		 10 kΩ or higher
      A52-17 (ACT) or E81-27 (ACT) - Body ground*2
      		Always
      		 10 kΩ or higher
      A52-19 (AC1) or E81-23 (AC1) - Body ground*2
      		Always
      		 10 kΩ or higher
      for 3UR-FE:
      Tester Connection
      		Condition
      		Specified Condition
      A38-17 (ACT) - E81-27 (ACT)
      		Always
      		Below 1 Ω
      A38-9 (AC1) - E81-23 (AC1)
      		Always
      		Below 1 Ω
      A38-17 (ACT) or E81-27 (ACT) - Body ground
      		Always
      		 10 kΩ or higher
      A38-9 (AC1) or E81-23 (AC1) - Body ground
      		Always
      		 10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

  1. w/ Rear Heater:

    1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).

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

      Standard Voltage:
      Tester Connection
      		Switch Condition
      		Specified Condition
      E36-11 (AC1) - Body ground
      1. Engine idling
      2. A/C switch off
      3. Blower switch LO
      		11 to 14 V
      E36-11 (AC1) - Body ground
      1. Engine idling
      2. A/C switch on
      3. Blower switch LO
      		Below 1 V


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

  1. w/ Rear Heater:

    1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).

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

      Standard Voltage:
      Tester Connection
      		Switch Condition
      		Specified Condition
      E81-23 (AC1) - Body ground
      1. Engine idling
      2. A/C switch off
      3. Blower switch LO
      		11 to 14 V
      E81-23 (AC1) - Body ground
      1. Engine idling
      2. A/C switch on
      3. Blower switch LO
      		Below 1 V
Text in Illustration
*a
Component with harness connected
(Air Conditioning Amplifier Assembly)
Result
Result
Proceed to
OK
A
NG (for 1VD-FTV)
B
NG (for 1GR-FE)
C
NG (for 1UR-FE)
D
NG (for 3UR-FE)
E


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)

E
REPLACE ECM (Click here)
A

REPLACE ECM (Click here)

10.CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER ASSEMBLY)
  1. *1: for LHD
  2. *2: for RHD

  1. w/ Rear Heater:

    1. Disconnect the A38*1 or A52*2 ECM connector.

    2. Disconnect the E36 air conditioning amplifier assembly connector.

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

      Standard Resistance:
      for 1VD-FTV:
      Tester Connection
      		Condition
      		Specified Condition
      A38-18 (ACT) - E36-22 (ACT)*1
      		Always
      		Below 1 Ω
      A52-18 (ACT) - E36-22 (ACT)*2
      		Always
      		Below 1 Ω
      A38-18 (ACT) or E36-22 (ACT) - Body ground*1
      		Always
      		 10 kΩ or higher
      A52-18 (ACT) or E36-22 (ACT) - Body ground*2
      		Always
      		 10 kΩ or higher
      for 1GR-FE, 1UR-FE:
      Tester Connection
      		Condition
      		Specified Condition
      A38-17 (ACT) - E36-22 (ACT)*1
      		Always
      		Below 1 Ω
      A52-17 (ACT) - E36-22 (ACT)*2
      		Always
      		Below 1 Ω
      A38-17 (ACT) or E36-22 (ACT) - Body ground*1
      		Always
      		 10 kΩ or higher
      A52-17 (ACT) or E36-22 (ACT) - Body ground*2
      		Always
      		 10 kΩ or higher
      for 3UR-FE:
      Tester Connection
      		Condition
      		Specified Condition
      A38-17 (ACT) - E36-22 (ACT)
      		Always
      		Below 1 Ω
      A38-17 (ACT) or E36-22 (ACT) - Body ground
      		Always
      		 10 kΩ or higher

  1. w/o Rear Heater:

    1. Disconnect the A38*1 or A52*2 ECM connector.

    2. Disconnect the E81 air conditioning amplifier assembly connector.

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

      Standard Resistance:
      for 1VD-FTV:
      Tester Connection
      		Condition
      		Specified Condition
      A38-18 (ACT) - E81-27 (ACT)*1
      		Always
      		Below 1 Ω
      A52-18 (ACT) - E81-27 (ACT)*2
      		Always
      		Below 1 Ω
      A38-18 (ACT) or E81-27 (ACT) - Body ground*1
      		Always
      		 10 kΩ or higher
      A52-18 (ACT) or E81-27 (ACT) - Body ground*2
      		Always
      		 10 kΩ or higher
      for 1GR-FE, 1UR-FE:
      Tester Connection
      		Condition
      		Specified Condition
      A38-17 (ACT) - E81-27 (ACT)*1
      		Always
      		Below 1 Ω
      A52-17 (ACT) - E81-27 (ACT)*2
      		Always
      		Below 1 Ω
      A38-17 (ACT) or E81-27 (ACT) - Body ground*1
      		Always
      		 10 kΩ or higher
      A52-17 (ACT) or E81-27 (ACT) - Body ground*2
      		Always
      		 10 kΩ or higher
      for 3UR-FE:
      Tester Connection
      		Condition
      		Specified Condition
      A38-17 (ACT) - E81-27 (ACT)
      		Always
      		Below 1 Ω
      A38-17 (ACT) or E81-27 (ACT) - Body ground
      		Always
      		 10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY)
OK


11.CHECK ECM


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

  1. w/ Rear Heater:

    1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here ).

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

      Standard Voltage:
      Tester Connection
      		Switch Condition
      		Specified Condition
      E36-22 (ACT) - Body ground
      1. Engine idling
      2. A/C switch off or on (magnet clutch off)
      3. Blower switch LO
      		Below 1V
      E36-22 (ACT) - Body ground
      1. Engine idling
      2. A/C switch on (magnet clutch on)
      3. Blower switch LO
      		4.5 to 5.5 V


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

  1. w/o Rear Heater:

    1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).

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

      Standard Voltage:
      Tester Connection
      		Switch Condition
      		Specified Condition
      E81-27 (ACT) - Body ground
      1. Engine idling
      2. A/C switch off or on (magnet clutch off)
      3. Blower switch LO
      		Below 1V
      E81-27 (ACT) - Body ground
      1. Engine idling
      2. A/C switch on (magnet clutch on)
      3. Blower switch LO
      		4.5 to 5.5 V
Text in Illustration
*a
Component with harness connected
(Air Conditioning Amplifier Assembly)
Result
Result
Proceed to
OK
A
NG (for 1VD-FTV)
B
NG (for 1GR-FE)
C
NG (for 1UR-FE)
D
NG (for 3UR-FE)
E


B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)

E
REPLACE ECM (Click here)
A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)