Heating Air Conditioning. 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:

INSPECTION PROCEDURE

NOTICE:

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

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.

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	-

Go to step 10

OK

2.INSPECT MAGNET CLUTCH RELAY (MG CLT)

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

Inspect the MG CLT relay (Click here).

REPLACE MAGNET CLUTCH RELAY (Click here)

OK

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

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

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)

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

w/ Rear Heater:

Reconnect the air conditioning amplifier assembly connector.

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

w/ Rear Heater:

Reconnect the air conditioning amplifier assembly connector.

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	Engine idling A/C switch off Blower switch LO	11 to 14 V
E81-20 (MGC) - Body ground	Engine idling A/C switch on Blower switch LO	Below 1 V

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

Go to step 8

OK

5.CHECK COOLER COMPRESSOR ASSEMBLY

Disconnect the C30 cooler compressor assembly connector.

Disconnect the magnet clutch assembly connector.

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

REPLACE COOLER COMPRESSOR ASSEMBLY (Click here)

A

6.INSPECT MAGNET CLUTCH ASSEMBLY

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

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

REPLACE MAGNET CLUTCH ASSEMBLY (Click here)

A

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

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

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

*1: for LHD
*2: for RHD

w/ Rear Heater:

Disconnect the A38*1 or A52*2 ECM connector.
Disconnect the E36 air conditioning amplifier assembly connector.

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

w/o Rear Heater:

Disconnect the A38*1 or A52*2 ECM connector.
Disconnect the E81 air conditioning amplifier assembly connector.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

w/ Rear Heater:

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

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	Engine idling A/C switch off Blower switch LO	11 to 14 V
E36-11 (AC1) - Body ground	Engine idling A/C switch on Blower switch LO	Below 1 V

w/ Rear Heater:

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

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	Engine idling A/C switch off Blower switch LO	11 to 14 V
E81-23 (AC1) - Body ground	Engine idling A/C switch on 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

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

REPLACE ECM (Click here)

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

*1: for LHD
*2: for RHD

w/ Rear Heater:

Disconnect the A38*1 or A52*2 ECM connector.
Disconnect the E36 air conditioning amplifier assembly connector.

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

w/o Rear Heater:

Disconnect the A38*1 or A52*2 ECM connector.
Disconnect the E81 air conditioning amplifier assembly connector.

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

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

OK

11.CHECK ECM

w/ Rear Heater:

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

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	Engine idling A/C switch off or on (magnet clutch off) Blower switch LO	Below 1V
E36-22 (ACT) - Body ground	Engine idling A/C switch on (magnet clutch on) Blower switch LO	4.5 to 5.5 V

w/o Rear Heater:

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

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	Engine idling A/C switch off or on (magnet clutch off) Blower switch LO	Below 1V
E81-27 (ACT) - Body ground	Engine idling A/C switch on (magnet clutch on) 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

REPLACE ECM (Click here)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)