Air Conditioning Compressor Magnetic Clutch Circuit

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

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch on (IG) and turn Techstream main switch on.

(c) Turn the A/C switch ON and OFF.

(d) Select the item below in the Data List, and read the display on Techstream.

Data List / Engine:





OK:

The display is as specified in the normal condition column.

NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (for Manual Air Conditioning System)
OK -- Continue to next step.

2. INSPECT FUSE (A/C NO. 2)

(a) Remove the A/C NO. 2 fuse from the instrument panel junction block.

(b) Measure the resistance of the fuse.

Standard resistance:





NG -- REPLACE FUSE (A/C NO. 2)
OK -- Continue to next step.

3. INSPECT MAGNET-CLUTCH RELAY (MG/CLT)

(a) Remove the MG/CLT relay from the engine room relay block and junction block.





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

Standard resistance:





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

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

(a) Disconnect the connector from the air conditioning amplifier.





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)
OK -- Continue to next step.

5. INSPECT AIR CONDITIONING AMPLIFIER

(a) Reconnect the connector to the air conditioning amplifier.





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

Standard voltage:





NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal
OK -- Continue to next step.

6. INSPECT COMPRESSOR AND MAGNETIC CLUTCH

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





(b) Measure the resistance of the connector.

(c) When connector terminal 3 (MG+) is connected to the positive (+) battery terminal, and the body ground is connected to the negative (-) battery terminal, check that the following occurs: 1) the magnetic clutch's operating sound is emitted, and 2) the magnetic clutch's hub and rotor lock.

Standard resistance:





NG -- REPLACE AIR CONDITIONING COMPRESSOR Removal
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (ENGINE ROOM R/B AND J/B - BATTERY)

(a) Remove the MG/CLT relay from the engine room relay block and junction block.





(b) Turn the ignition switch on (IG).

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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR