Air Conditioning Compressor Magnetic Clutch Circuit

HEATING / 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 air conditioning amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the air conditioning amplifier. Then, the magnetic clutch relay (MG CLUTCH) 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

1. CHECK CAN COMMUNICATION SYSTEM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Select "Communication Bus Check"

OK:

All ECUs and sensors connected to the CAN communication system are displayed.

NG -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (MAGNETIC CLUTCH RELAY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Check that the relays operate.

Air Conditioner





OK:

The magnetic clutch operates normally.

NG -- REPLACE INTEGRATION RELAY
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (A/C SIGNAL)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) Check the value(s) by referring to the table below.

Engine





OK:

The display is as specified in the normal condition.

NG -- REPLACE AIR CONDITIONING AMPLIFIER

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (For Automatic Air Conditioning System)

4. REPLACE INTEGRATION RELAY

(a) Temporarily replace the integration relay with a new or normally functioning one.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(f) Check that the relays operate.

Air Conditioner





OK:

The magnetic clutch operates normally.

NG -- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)

OK -- REPLACE INTEGRATION RELAY

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





(a) Disconnect the air conditioning amplifier connector.

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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BATTERY)
OK -- Continue to next step.

6. INSPECT AIR CONDITIONING AMPLIFIER (MGC VOLTAGE)





(a) Remove the air conditioning amplifier with its connectors still connected Removal.

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

Standard Voltage:





Text in Illustration





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

7. INSPECT AIR CONDITIONING COMPRESSOR (COMPRESSOR HARNESS)





(a) Disconnect the air conditioning 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 AIR CONDITIONING COMPRESSOR Removal
OK -- Continue to next step.

8. INSPECT MAGNETIC CLUTCH

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





Standard Resistance:





Text in Illustration





(b) When connector terminal 1 is connected to the 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.

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

9. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING COMPRESSOR - INTEGRATION RELAY)

(a) Disconnect the air conditioning compressor connector.

(b) Remove the integration relay connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal

10. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BATTERY)





(a) Remove the integration relay 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 -- REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR CONDITIONING AMPLIFIER - INTEGRATION RELAY)

11. REPLACE AIR CONDITIONING AMPLIFIER

(a) Replace the air conditioning amplifier with a normal one Removal.

(b) Check that the condition returns to normal.

OK:

Same problem does not occur.

NG -- REPLACE ECM Removal

OK -- END (AIR CONDITIONING AMPLIFIER IS FAULTY)