Air Conditioning Compressor Magnetic Clutch Circuit

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): Air Conditioning Compressor Magnetic Clutch Circuit
- Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MG CLT relay turns on to operate the magnetic clutch.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Use Techstream to check if the CAN communication system is functioning normally.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.

2. CHECK MULTIPLEX COMMUNICATION SYSTEM

(a) Use Techstream to check if the multiplex communication system is functioning normally.

Result:





B -- GO TO MULTIPLEX COMMUNICATION SYSTEM
A -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to the ON position and turn Techstream on.

(c) Select the item below in the Active Test and then check that the relay operates.

Active Test / Air Conditioner:





OK:

Magnetic clutch relay operates.

NG -- INSPECT FUSE (HTR)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4. INSPECT FUSE (HTR)

(a) Remove the HTR fuse from the driver side junction block.

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

Standard resistance:





(c) Reconnect the HTR fuse to the driver side junction block.

NG -- REPLACE FUSE (HTR)
OK -- Continue to next step.

5. INSPECT RELAY (MG CLT)

(a) Remove the MG CLT relay from the No. 3 relay block.





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

Standard resistance:





(c) Install the MG CLT relay to the No. 3 relay block.

NG -- REPLACE RELAY (MG CLT)
OK -- Continue to next step.

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

(a) Disconnect the connector from the A/C amplifier.





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. INSPECT A/C AMPLIFIER

(a) Reconnect the connector to the A/C amplifier.





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

Standard voltage:





NG -- REPLACE A/C AMPLIFIER
OK -- Continue to next step.

8. INSPECT COMPRESSOR AND MAGNETIC CLUTCH

(a) Disconnect the connector from the compressor and magnetic clutch.





(b) Disconnect the connector from the magnetic clutch.





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

Standard resistance:





NG -- REPLACE COMPRESSOR AND MAGNETIC CLUTCH
OK -- Continue to next step.

9. INSPECT MAGNETIC CLUTCH

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





Standard resistance:





(b) 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.

NG -- REPLACE MAGNETIC CLUTCH
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK - BATTERY)

(a) Remove the MG CLT relay from the No. 3 relay block.





(b) Turn the ignition switch to the ON position.

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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 RELAY BLOCK - COMPRESSOR AND MAGNETIC CLUTCH)

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR