MX-5 Miata L4-1.8L DOHC (1996)
Radiator Cooling Fan Motor Relay: Testing and Inspection
Procedures With Tester
COOLING FAN
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Verify that the engine is cold.
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Turn the ignition switch to ON.
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Verify that the cooling fan is not operating.
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If the cooling fan is operating, do as follows:
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Connect the SSTs (NGS) to the data link connector-2.
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Select the PID/DATA MONITOR AND RECORD function on the NGS display.
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By using the "FANC" and verify that the cooling fan control signal is OFF.
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If the cooling fan control signal is ON, check the following:
- ECM terminal voltage
- Engine coolant temperature signal
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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)
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Connect the SST (System Selector) to the data link connector.
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Set switch A to position 1.
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Set the test switch to SELF TEST.
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Depress the accelerator pedal and verify that the cooling fan operates.
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If the cooling fan does not operate, do as follows:
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Connect the SSTs (NGS) to the data link connector-2.
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Select the SIMULATION TEST function on the NGS display.
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Turn the cooling fan relay from OFF to ON by using the "FANC" and check for the cooling fan operation.
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If the cooling fan operates, check the following:
- ECM terminal voltage
- Test mode signal
- Closed throttle position signal
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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
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Verify that engine is cold and the A/C switch and blower switch are OFF.
