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Home >> Mazda >> 1996 >> MX-5 Miata L4-1.8L DOHC >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Cooling System >> Relays and Modules - Cooling System >> Radiator Cooling Fan Motor Relay >> Testing and Inspection >> Procedures With Tester

Procedures With Tester

COOLING FAN
- Verify that the engine is cold.
- Turn the ignition switch to ON.
- Verify that the cooling fan is not operating.
- If the cooling fan is operating, do as follows:
- Connect the SSTs (NGS) to the data link connector-2.





- Select the PID/DATA MONITOR AND RECORD function on the NGS display.
- By using the "FANC" and verify that the cooling fan control signal is OFF.
- If the cooling fan control signal is ON, check the following:
- ECM terminal voltage
- Engine coolant temperature signal
- If the cooling fan control signal is OFF, check the following:
- Cooling fan relay
- Short circuit in wiring harnesses and connectors (Main relay - Cooling fan relay - ECM)





- Connect the SST (System Selector) to the data link connector.
- Set switch A to position 1.
- Set the test switch to SELF TEST.
- Depress the accelerator pedal and verify that the cooling fan operates.
- If the cooling fan does not operate, do as follows:
- Connect the SSTs (NGS) to the data link connector-2.





- Select the SIMULATION TEST function on the NGS display.
- Turn the cooling fan relay from OFF to ON by using the "FANC" and check for the cooling fan operation.
- If the cooling fan operates, check the following:
- ECM terminal voltage
- Test mode signal
- Closed throttle position signal
- If the cooling fan does not operate, do as follows:
- Turn the cooling fan relay from OFF to ON by using the simulation function. Operate the cooling fan relay and check it the operation sound of the relay is heard.
- If the operation sound is heard, check the following:
- Wiring harnesses and connectors (Cooling fan relay - Cooling fan motor)
- Cooling fan motor
- If the operation sound is not heard, check the following:
- Cooling fan relay
- Open circuit in wiring harnesses and connectors (Main relay - Cooling fan relay - ECM)

CONDENSER FAN RELAY
- Verify that engine is cold and the A/C switch and blower switch are OFF.
- Start the engine and let it idle.
- Verify that the condenser fan is not operating.
- If the condenser fan is operating, check the short circuit in wiring between condenser fan relay and ECM terminal 1B.
- Turn the A/C switch and blower switch on.
- Verify that the condenser fan is operating.
- Turn the A/C switch and blower switch off.
- If the condenser fan does not operate do as follows:
- Connect the SSTs (NGS) to the data link connector-2.





- Select the SIMULATION TEST function on the NGS display.
- Turn the condenser fan relay from OFF to ON by using the "FANN" and check for the condenser fan operation.
- If the condenser fan operates, check the following:
- ECM terminal voltage
- A/C signal
- If the condenser fan does not operate, do as follows:
- Turn the condenser fan relay from OFF to ON by using the simulation function. Operate the condenser fan relay and check if the operation sound of the relay is heard.
- If the operation sound is heard, check the following:
- Wiring harness and connectors (Condenser fan relay - Condenser fan motor)
- Condenser fan motor
- If the operation sound is not heard, check the following:
- Condenser fan relay
- Open circuit in wiring harness and connectors (Main relay - Condenser fan relay - ECM)
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