Coolant Temperature Switch - Test
This procedure tests the coolant temperature switch for correct operation. Perform this procedure when the engine is running.
- Use the 6V-7070 Digital Multimeter to measure the resistance of the coolant temperature switch. When the temperature of the coolant is 50 °C (122 °F) or less, disconnect the wire connector from the coolant temperature switch.
- Place one lead of the multimeter on the connector of the coolant temperature switch. Place the other lead of the multimeter on a ground for the coolant temperature switch.
Measure the resistance. The resistance should be 360.0 ± 0.2 ohms.
- Repeat the previous step when the temperature of the coolant is approximately 120 °C (248 °F). The resistance should not be less than 39 ohms.
- If the resistance through the coolant temperature switch is not within the given resistances, replace the coolant temperature switch.
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