I have a problem on my 2000 MPI at the moment which is running the radiator fan constantly and I am assuming is in 'Limp Home' mode as it's not running particularly well...
I had thought the CTS was at fault but tested the resistance and it was giving reasonable values from cold and hot when probed with a multimeter. I also checked the connectivity from the CTS connector back to the ECU connectors and that was also fine. One thing I didn't check was the quality of the connection between the CTS connector and the sensor itself so I assumed this was at fault and bought the modified connector from minispares and fitted it this afternoon but the fan still comes on
I know that a coolant sensor failure will cause the fan to run constantly and the car to run in 'Limp Home' mode but is the fan running constantly caused specifically by the CTS failure or will it always run in 'Limp Home' mode. i.e. another sensor failure could result in the fan running constantly?