Air Conditioning Compressor Magnetic Clutch Circuit
HEATING / AIR CONDITIONING: 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 CLT) turns on to operate the magnetic clutch.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK CAN COMMUNICATION SYSTEM
(a) Connect the Techstream to 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 Initial Inspection and Diagnostic Overview
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (A/C SIGNAL)
(a) Connect the Techstream to DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / A/C Signal
(e) According to the display on the Techstream, read the Data List.
ECM
OK:
The display is as specified in the normal condition.
NG -- INSPECT FUSE (A/C IG)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table
3. INSPECT FUSE (A/C IG)
(a) Remove the A/C IG fuse from the main body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Reinstall the A/C IG fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
4. INSPECT MAGNETIC CLUTCH RELAY (MG CLT)
(a) Remove the magnetic clutch relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Reinstall e the magnetic clutch relay.
NG -- REPLACE MAGNETIC CLUTCH RELAY
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)
(a) Disconnect the H24 air conditioning amplifier connector.
(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.
6. CHECK AIR CONDITIONING AMPLIFIER (MGC VOLTAGE)
(a) Reconnect the H24 air conditioning amplifier connector.
(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.
7. INSPECT AIR CONDITIONING COMPRESSOR (COMPRESSOR HARNESS)
(a) Disconnect the D39 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:
NG -- REPAIR AIR CONDITIONING COMPRESSOR
OK -- Continue to next step.
8. INSPECT MAGNETIC CLUTCH
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(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.
(c) Reconnect the air conditioning compressor connector.
(d) Reconnect the magnetic clutch connector.
NG -- REPLACE MAGNETIC CLUTCH Disassembly
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING COMPRESSOR - ENGINE ROOM RELAY BLOCK)
(a) Disconnect the D39 air conditioning compressor connector.
(b) Remove the magnetic clutch relay (MG CLT) from the engine room relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(d) Reinstall the magnetic clutch relay (MG CLT).
(e) Reconnect the air conditioning compressor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY)
(a) Remove the magnetic clutch relay (MG CLT) from the engine room relay block.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(c) Reinstall the magnetic clutch relay.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal