Air Conditioning System Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (A/C COMP)

READ VALUE OF INTELLIGENT TESTER

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

INSPECT RELAY (A/C COMP)

INSPECT A/C COMPRESSOR

CHECK WIRE HARNESS (ENGINE ROOM NO. 2 RELAY BLOCK - A/C COMPRESSOR)

CHECK WIRE HARNESS (ENGINE ROOM NO. 2 RELAY BLOCK - ECM)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Remove the A/C COMP fuse from the engine room No. 2 junction block.
   

2. Measure the resistance of the fuse.
   

Standard resistance:

Tester Item	Condition	Specified Condition
A/C COMP fuse	Always	Below 1 Ω

1. Connect the intelligent tester to the DLC3.
   

2. Turn the engine switch on (IG) and push the intelligent tester main switch on.
   

3. Select the item below in the Data List, and read the displays on the intelligent tester.
   
   

   ECM:

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   A/C Magnetic Clutch Relay (A/C Mag Clutch)	A/C Magnetic Clutch Relay / OFF, ON	ON: A/C magnetic clutch ON OFF: A/C magnetic clutch OFF	-

   OK:

   The display is the condition.
   

1. Select the item below in the Active Test, and read the displays on the intelligent tester.
   
   

   A/C amplifier:

   Item	Test Details / Display (Range)	Diagnostic Note
   Magnetic Clutch Relay (A/C Mag Clutch)	Magnetic Clutch Relay / OFF, ON	-

1. Remove the A/C COMP relay from the engine room No. 2 relay block.
   

2. Measure the resistance of the relay.
   

   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)

1. Disconnect the E46 A/C compressor connector.
   

2. Measure the resistance of the connector.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   1 (MG+) - Body ground	Always	Below 1 Ω

3. When connector terminal 1 (MG+) is connected to the positive (+) battery terminal, and the body ground is connected to the negative (-) battery terminal, check that the following occurs: 1) the magnetic clutch's operating sound is emitted, and 2) the magnetic clutch's hub and rotor lock.
   

1. Remove the A/C COMP relay from the engine room No. 2 relay block.
   

2. Disconnect the E46 A/C compressor connector.
   

3. Measure the resistance of the wire harness side connector.
   

   Standard resistance:

   Tester Connection	Specified Condition
   Relay block A/C COMP relay terminal 3- E46-1 (MG+)	Below 1 Ω

1. Remove the A/C COMP relay from the engine room No. 2 relay block.
   

2. Disconnect the A7 ECM connector.
   

3. Measure the resistance of the wire harness side connectors.
   

   Standard resistance:

   Tester Connection	Specified Condition
   Relay block A/C COMP relay terminal 2 - A7-11 (ACMG)	Below 1 Ω