QUESTION
We have a customer's Lotus Esprit turbo in our workshop and the temperature gauge does not work
Can you please provide advice on how to trouble-shoot this problem
C.J. - Albion, Queensland, Australia
ANSWER
The quickest way to isolate what works and what doesn't, is to remove the electrical lead from the temperature transmitter and short out the connector to earth.
NOTE - The temperature transmitter and corresponding electrical lead are located at the thermostat housing on the Esprit water pump
If the cable and gauge are OK, then the needle on the gauge should swing hard over to the highest temperature reading.
If you start the engine and run it up to normal operating temperature and wait for the cooling fans to cut in then turn off again, measure the temperature transmitter resistance at 95 degrees Centigrade and it should be approximately 100 Ohms.
NOTE - The temperature transmitter should have a resistance of approximately 120 Ohms at normal engine operating temperature of 85 degrees Centigrade.
If the above resistance readings are observed, then the temperature transmitter is working correctly.
The temperature transmitter should read approximately 1.2K Ohms at an ambient temperature of 20 degrees centigrade.
Copyright © 2012 Lotus Marques
We have a customer's Lotus Esprit turbo in our workshop and the temperature gauge does not work
Can you please provide advice on how to trouble-shoot this problem
C.J. - Albion, Queensland, Australia
ANSWER
The quickest way to isolate what works and what doesn't, is to remove the electrical lead from the temperature transmitter and short out the connector to earth.
NOTE - The temperature transmitter and corresponding electrical lead are located at the thermostat housing on the Esprit water pump
If the cable and gauge are OK, then the needle on the gauge should swing hard over to the highest temperature reading.
If you start the engine and run it up to normal operating temperature and wait for the cooling fans to cut in then turn off again, measure the temperature transmitter resistance at 95 degrees Centigrade and it should be approximately 100 Ohms.
NOTE - The temperature transmitter should have a resistance of approximately 120 Ohms at normal engine operating temperature of 85 degrees Centigrade.
If the above resistance readings are observed, then the temperature transmitter is working correctly.
The temperature transmitter should read approximately 1.2K Ohms at an ambient temperature of 20 degrees centigrade.
Copyright © 2012 Lotus Marques
