Symptom Related Diagnostic Procedures

Magnetic Clutch Diagnosis
When the air conditioning switch and the fan control knob (fan switch) are turned on with the engine running, current flows through the thermostat and the compressor relay to activate the magnetic clutch.

The air conditioning can be stopped by turning of the air conditioning switch or the fan control knob (fan switch). However, even when the air conditioning is in operation, the electronic thermostat, the pressure switch or the Powertrain Control Module is used to stop the air conditioning temporarily by turning off the magnetic clutch in the prearranged conditions to reduce the engine load which is being caused by the rise in the engine coolant temperature, and the acceleration of the vehicle, etc.

For the inspection of the relays, switches and units in the table, refer to Individual Inspection.

Steps 1 - 7:

Steps 8 - 14:

Steps 15 - 19:

Step 20:

Magnetic Clutch Does Not Run


Inspection

Drive Plate
If the frictional surface shows signs of damage due to excessive heat, the drive plate and pulley should be replaced.

Pulley Assembly
Check the appearance of the pulley assembly. If the frictional surface of the pulley shows signs of excessive grooving due to slippage, both the pulley and drive plate should be replaced. The frictional surfaces of the pulley assembly should be cleaned with a suitable solvent before reinstallation.

Coil
Check coil for loose connector or cracked insulation.