Air Conditioning Compressor Magnetic Clutch Circuit

AIR CONDITIONING SYSTEM: Air Conditioning Compressor Magnetic Clutch Circuit

Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the A/C amplifier is turned on, the 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. PERFORM ACTIVE TEST USING INTELLIGENT TESTER
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the intelligent tester main switch on.
(c) Select the item below in the ACTIVE TEST and then check that the relay operates.

ACTIVE TEST / AIR CONDITIONER:





OK:
The magnetic clutch relay operates.
NG -- CHECK HARNESS AND CONNECTOR (POWER SOURCE)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (POWER SOURCE)





(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 -- CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BATTERY)
OK -- Continue to next step.
3. INSPECT AIR CONDITIONING 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 AIR CONDITIONING AMPLIFIER
OK -- Continue to next step.
4. INSPECT COMPRESSOR AND MAGNETIC CLUTCH





(a) Disconnect the connector from the compressor and magnetic clutch.
(b) Connect the positive (+) lead from the battery to terminal 1, and the negative (-) lead to body ground, then 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 COMPRESSOR AND MAGNETIC CLUTCH
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (COMPRESSOR AND MAGNETIC CLUTCH - J/B NO. 2)





(a) Disconnect the connector from the junction block No. 2.





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE JUNCTION BLOCK NO. 2
6. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BATTERY)





(a) Disconnect the connector from the junction block No. 2.
(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. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - J/B NO. 2)





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





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE JUNCTION BLOCK NO. 2