Magnetic Clutch Does Not Operate

Symptom: Magnetic Clutch Does Not Operate.

Note: If the blower fan motor also does not operate, see "Blower Motor Does Not Operate".

Normal operation of magnetic clutch
The magnetic clutch is supplied with battery voltage as follows:
1. A/C and blower switches are turned ON.
2. ECU receives signal that A/C and blower switches are ON and creates ground circuit
3. A/C relay is magnetized and contact is closed.
4. Battery voltage is applied to magnetic clutch and clutch locks.

Note: The ECU also controls the additional fan and magnetic clutch operation depending on engine load.


Step 1
1. Check the following fuses.







2. If the fuses are OK, go to Step 2.
3. If a fuse is burned, check for a short circuit in the harness before replacing it.

Step 2
1. Run the engine at idle.
2. Turn the A/C switch and blower switch ON.








3. Measure the voltage at terminal-wire of the magnetic clutch connector

Step 3
1. Disconnect the magnetic clutch connector.





2. Check for continuity between the magnetic clutch connector and a body ground.

Note: Set the ohmmeter to X1,OOO range.

3. If there is no continuity, replace the magnetic clutch.
4. If there is continuity, adjust the magnetic clutch clearance or check the compressor for internal trouble.


Step 4
1. Start the engine.
2. Turn the A/C switch and blower switch ON.









3. Measure the voltage at the following terminal-wires of the A/C relay connector.


Step 5









1. Measure the voltage at the following terminal-wires of the refrigerant pressure switch No.1 connector.


Step 6




1. Measure the refrigerant pressure.

Normal pressure
Low-pressure side: 196 - 294 kPa (2.0 - 3.0 kg/cm2, 28 - 43 psi)
High-pressure side: 1,373 - 1,570 kPa (14.0 - 16.0 kg/cm2, 199 - 228 psi)

2. If not as specified, check the refrigerant system by referring to the "Insufficient Cooling, No Cooling, Intermittent Cooling" troubleshooting chart.
3. If correct, replace the refrigerant pressure switch.