Air Conditioning System Air Conditioning Compressor Magnetic Clutch Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK MULTIPLEX COMMUNICATION SYSTEM
CHECK CAN COMMUNICATION SYSTEM
READ VALUE OF INTELLIGENT TESTER
READ VALUE OF INTELLIGENT TESTER
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
INSPECT FUSE (A/C COMP)
INSPECT RELAY (A/C COMP)
INSPECT A/C COMPRESSOR
INSPECT MAGNETIC CLUTCH
CHECK WIRE HARNESS (ENGINE ROOM R/B AND J/B NO. 2 - A/C COMPRESSOR)
CHECK WIRE HARNESS (ENGINE ROOM R/B AND J/B NO. 2 - ECM)
REPLACE AIR CONDITIONING AMPLIFIER
AIR CONDITIONING SYSTEM - Air Conditioning Compressor Magnetic Clutch Circuit |
DESCRIPTION
The A/C amplifier sends a magnetic clutch ON command signal to the ECM through the BEAN line and CAN line. Then the ECM turns the A/C COMP relay on to turn the magnetic clutch on.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK MULTIPLEX COMMUNICATION SYSTEM |
Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.
- Result:
Result
| Proceed to
|
MPX DTC is not output
| A
|
MPX DTC is output
| B
|
| | GO TO MULTIPLEX COMMUNICATION SYSTEM |
|
|
| 2.CHECK CAN COMMUNICATION SYSTEM |
Use the intelligent tester to check if the CAN Communication System is functioning normally.
- Result:
Result
| Proceed to
|
CAN DTC is not output
| A
|
CAN DTC is output
| B
|
| | GO TO CAN COMMUNICATION SYSTEM |
|
|
| 3.READ VALUE OF INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the intelligent tester main switch on.
Turn the A/C switch on and off.
Select the item below in the Data List, and read the display on the intelligent tester.
Data List / Engine:Item
| Measure Item
| Normal Condition
| Diagnostic Note
|
A/C Signal
(A/C Signal)
| A/C signal / ON or OFF
| ON: A/C ON
OFF: A/C OFF
| -
|
- OK:
- The display is as specified in the normal condition column.
| 4.READ VALUE OF INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the intelligent tester main switch on.
Change the blower fan speed to LO using the blower switch.
Turn the A/C switch on and off.
Select the item below in the Data List, and read the display on the intelligent tester.
Data List / Engine:Item
| Measure Item
| Normal Condition
| Diagnostic Note
|
A/C Magnetic Clutch Relay
(A/C Magnetic Clutch Relay)
| A/C magnetic clutch relay / OFF, ON
| ON: A/C magnetic clutch ON
OFF: A/C magnetic clutch OFF
| -
|
- OK:
- The display is as specified in the normal condition.
| 5.PERFORM ACTIVE TEST BY INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the intelligent tester main switch on.
Select the item below in the Active Test and read the display on the intelligent tester.
Active Test / Engine:Item
| Test Details / Display (Range)
| Diagnostic Note
|
Magnetic Clutch Relay
(A/C Mag Clutch)
| Magnetic Clutch Relay / OFF, ON
| -
|
- OK:
- The magnetic clutch operates normally.
| | PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
| 6.INSPECT FUSE (A/C COMP) |
Remove the A/C COMP fuse from the engine room R/B and J/B No. 2.
Measure the resistance of the fuse.
- Standard resistance:
Tester Item
| Condition
| Specified Condition
|
A/C COMP fuse
| Always
| Below 1 Ω
|
| 7.INSPECT RELAY (A/C COMP) |
Remove the A/C COMP relay from the engine room R/B and J/B No. 2.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Specified Condition
|
3 - 5
| 10 kΩ or higher
|
3 - 5
| Below 1 Ω
(when battery voltage is applied to terminals 1 and 2)
|
Disconnect the A/C compressor connector.
Disconnect the magnetic clutch connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Condition
| Specified Condition
|
E8-1 (MG+) - A-1
| Always
| Below 1 Ω
|
E8-1 (MG+) - Body ground
| Always
| 10 kΩ or higher
|
| 9.INSPECT MAGNETIC CLUTCH |
Measure the resistance of the connector.
- Standard resistance:
Tester Connection
| Condition
| Specified Condition
|
A-1 - Body ground
| Always
| 3.4 to 3.8 Ω
|
When connector terminal A1 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.
| 10.CHECK WIRE HARNESS (ENGINE ROOM R/B AND J/B NO. 2 - A/C COMPRESSOR) |
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection
| Specified Condition
|
Relay block A/C COMP relay terminal 5 - Body ground
| 10 to 14 V
|
Relay block A/C COMP relay terminal 1 - Body ground
| 10 to 14 V
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 11.CHECK WIRE HARNESS (ENGINE ROOM R/B AND J/B NO. 2 - ECM) |
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Specified Condition
|
Relay block A/C COMP relay terminal 2 - A6-13 (ACMG)
| Below 1 Ω
|
A6-13 (ACMG) - Body ground
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK |
|
|
|
| REPAIR OR REPLACE HARNESS OR CONNECTOR (A/C COMPRESSOR - ENGINE ROOM R/B AND J/B NO. 2) |
|
| 12.REPLACE AIR CONDITIONING AMPLIFIER |
Replace the A/C amplifier with a normal one and check that the condition returns to normal.
- OK:
- Same problem does not occur.
