Air Conditioning Compressor Magnetic Clutch Circuit

HEATING / 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 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
NOTICE: Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Use the Techstream to check if the CAN communication system is functioning normally.
Result:





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

2. INSPECT RELAY (MGC)




(a) Remove the MGC 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 RELAY (MGC)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - BATTERY)




(a) Remove the MGC relay from the engine room relay block and junction block.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





Text in Illustration





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

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




(a) Disconnect the A/C amplifier connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





Text in Illustration





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

5. INSPECT A/C AMPLIFIER




(a) Reconnect the A/C amplifier connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





Text in Illustration





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

6. INSPECT A/C COMPRESSOR




(a) Disconnect the A/C compressor connector.




(b) Disconnect the magnetic clutch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





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

7. INSPECT MAGNETIC CLUTCH




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





(b) When connector terminal d3-1 is connected to a positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch operating sound can be heard, and 2) the magnetic clutch hub and rotor lock.

Text in Illustration





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

8. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - BATTERY)




(a) Remove the MGC relay from the engine room relay block and junction block.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





Text in Illustration





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

9. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - A/C COMPRESSOR)




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





Result:





Text in Illustration





C -- REPLACE A/C AMPLIFIER
B -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
A -- REPAIR OR REPLACE HARNESS OR CONNECTOR