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, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MGC 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. READ VALUE USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn Techstream 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
OK -- Continue to next step.
3. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn Techstream on.
(c) Select the item below in the Active Test and check that the magnetic clutch relay operates.

Active Test / Air Conditioner:





OK:
The magnetic clutch relay operates normally.
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.
4. INSPECT FUSE (A/C NO. 2)




(a) Remove the A/C No. 2 fuse from the instrument panel J/B.
(b) Measure the resistance of the fuse.
Standard resistance:





(c) Reconnect the A/C No. 2 fuse to the instrument panel J/B.
NG -- REPLACE FUSE (A/C NO. 2)
OK -- Continue to next step.
5. INSPECT RELAY (MGC)




(a) Remove the MGC relay from the engine room R/B and J/B.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Install the MGC relay to the engine room R/B and J/B.
NG -- REPLACE RELAY (MGC)
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 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.
8. INSPECT A/C COMPRESSOR




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




(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 A/C COMPRESSOR
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 A-1 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 (ENGINE ROOM R/B AND J/B - BATTERY)




(a) Remove the MGC relay from the engine room R/B and J/B.
(b) Turn the engine 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 (ENGINE ROOM R/B AND J/B - A/C COMPRESSOR)