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

for Preparation Click here


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


E176792E01


INSPECTION PROCEDURE

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

1.CHECK CAN COMMUNICATION SYSTEM

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Select "Communication Bus Check"

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



NG
GO TO CAN COMMUNICATION SYSTEM (Click here)
OK


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MAGNETIC CLUTCH RELAY)

  1. Connect the intelligent tester to DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Air Conditioner / Active Test / Magnetic Clutch Relay.

  1. According to the display on the intelligent tester, read the Data List.


Air Conditioner 
Tester Display
Test Part
Control Range
Diagnostic Note
Magnetic Clutch Relay
Magnetic clutch relay
on or off
OFF, ON
-

OK:
The magnetic clutch operates normally.



NG
Go to step 4
OK


3.READ VALUE USING INTELLIGENT TESTER (A/C SIGNAL)

  1. Connect the intelligent tester to DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List.

  1. According to the display on the intelligent tester, read the Data List.


Engine and ECT 
Tester Display
Measurement Item/Range
Normal Condition
Diagnostic Note
A/C Signal
A/C switch signal / ON or OFF
ON: A/C on
OFF: A/C off
-

OK:
The display is as specified in the normal condition.



NG
Go to step 11
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

4.INSPECT INTEGRATION RELAY (MAGNETIC CLUTCH RELAY)
E176788E01

  1. Remove the integration relay from the No. 1 engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1D-6 - 1F-9*1
    1D-6 - 1F-3*2
    		When battery voltage is not applied between terminals
    		10 kΩ or higher
    When battery voltage is applied to terminals 1D-6 and 1D-1*1, 1D-4*2
    		Below 1 Ω

    *1: for 1KR-FE
    *2: for 1ND-TV

  1. Reinstall the integration relay.

Text in Illustration 
*1
Component without harness connected
(Integration relay)


NG
REPLACE INTEGRATION RELAY (MAGNETIC CLUTCH RELAY)
OK


5.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)
E177667E01

  1. Disconnect the D16 air conditioning amplifier connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D16-15 (MGC) - Body ground
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		11 to 14 V

  1. Reconnect the D16 air conditioning amplifier connector.

Text in Illustration 
*1
Rear view of wire harness connector
(to Air Conditioning Amplifier)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK AIR CONDITIONING AMPLIFIER (MGC VOLTAGE)
E177746E01

  1. Remove the air conditioning amplifier with its connectors still connected (Click here).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D16-15 (MGC) - Body ground
    		Engine running and A/C switch on
    		Below 1 V
    Engine running and A/C switch off
    		11 to 14 V

  1. Reinstall the air conditioning amplifier.

Text in Illustration 
*1
Component with harness connected
(Air Conditioning Amplifier)


NG
REPLACE AIR CONDITIONING AMPLIFIER (Click here)
OK


7.INSPECT AIR CONDITIONING COMPRESSOR (COMPRESSOR HARNESS)
E176789E03

  1. Disconnect the D39 air conditioning compressor connector.

  1. Disconnect the magnetic clutch connector.

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

Standard Resistance:
Tester Connection
Condition
Specified Condition
3 (MG+) - 1
Always
Below 1 Ω
3 (MG+) - Body ground
Always
10 kΩ or higher

Result 
Result
Proceed to
OK
A
NG (for 1KR-FE)
B
NG (for 1ND-TV)
C
Text in Illustration 
*1
Component without harness connected
(Air Conditioning Compressor)
*2
Component without harness connected
(Magnetic Clutch)


NG
REPLACE AIR CONDITIONING COMPRESSOR (Click here)

NG
REPLACE AIR CONDITIONING COMPRESSOR (Click here)
OK


8.INSPECT MAGNETIC CLUTCH
E146516E02

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

Standard Resistance:
Tester Connection
Condition
Specified Condition
1 - Body ground
Always
3.4 to 3.8 Ω

  1. 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.

Result 
Result
Proceed to
OK
A
NG (for 1KR-FE)
B
NG (for 1ND-TV)
C

  1. Reconnect the air conditioning compressor connector.

  1. Reconnect the magnetic clutch connector.

Text in Illustration 
*1
Component without harness connected
(Magnetic Clutch)


B
REPLACE MAGNETIC CLUTCH (Click here)

C
REPLACE MAGNETIC CLUTCH (Click here)
A


9.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING COMPRESSOR - INTEGRATION RELAY)
E176790E02

  1. Disconnect the B33 air conditioning compressor connector.

  1. Remove the 1F integration relay connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B33-3 (MG+) - 1F-9*1
    B33-3 (MG+) - 1F-3*2
    		Always
    		Below 1 Ω
    B33-3 (MG+) - Body ground
    		Always
    		10 kΩ or higher

    *1: for 1KR-FE
    *2: for 1ND-TV

  1. Reconnect the integration relay connector.

  1. Reconnect the air conditioning compressor connector.

Text in Illustration 
*1
Front view of wire harness connector
(to Air Conditioning Compressor)
*2
Front view of wire harness connector
(to Integration Relay)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER (Click here)  

10.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BATTERY)
E176791E02

  1. Remove the 1D integration relay connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1D-6 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V

  1. Reconnect the integration relay connector.

Text in Illustration 
*1
Front view of wire harness connector
(to Integration Relay)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER (Click here)  

11.REPLACE AIR CONDITIONING AMPLIFIER

  1. Replace the air conditioning amplifier with a normal one (Click here).

  1. Check that the condition returns to normal.

OK:
Same problem does not occur.

Result 
Result
Proceed to
OK
A
NG (for 1KR-FE)
B
NG (for 1ND-TV)
C


NG
REPLACE ECM (Click here)

NG
REPLACE ECM (Click here)
A

END (AIR CONDITIONING AMPLIFIER IS FAULTY)