MX-5 Miata L4-1597cc 1.6L DOHC (1992)
2. Measure the voltage at the terminals of the condenser fan relay.
Magnetic Clutch and Condenser Fan Do Not Operate
Normal Operation
The ECM controls the condenser fan and magnetic clutch depending on the A/C signal. When the A/C and fan switches are on, the A/C signal circuit
is grounded. The ECM then closes the A/C and condenser fan relay ground circuits.
If the refrigerant pressure becomes abnormal, the refrigerant pressure switch will open the A/C signal circuit. If the evaporator temperature becomes
too low, the thermoswitch will open the A/C signal circuit. The ECM then cuts off the above two relays to prevent damage to the refrigerant system.
Step 1
1. Disconnect the refrigerant pressure switch connector.
2. Turn the ignition switch to ON.
3. Measure the voltage at terminal B of the refrigerant pressure switch connector.