Do temp sensors just fail without notice? I had my car running just fine with coolant temps reading 82 degrees through my microtech dash display. Turned it off and 10 seconds later I fired it up again, only to have the idle screaming at 1650 rpm and the temp reading at -25 degrees!!! I'm assuming that the high idle has something to do with the ecu thinking that my temps are freezing? I have checked for corrosion and found nothing but clean fittings (sensor is newish). Is there a way to check the sensor, should I remove it and test with a naked flame? I have switched off the power but this dosn't seem to help. Any ideas would be most welcome.
Just removed it and it is very hot to touch, standard pod gauge is at the centre, so temps must be up near 85 deg. Sh*t this is a pain as my car is going to the spray painters tomorrow, can I check with multi meter, and if so how?
Stock Gauge and CTS use two different sensors. The Microtech and ECU read the CTS, and the Temp Gauge reads the other sensor. That's the two sensors on the top radiator hardpipe.
Could be a bad sensor harness connector ? - boots get brittle and crack over the years letting moisture get into the contacts and causing bad connections.
All fixed, a huge thank you to Ross for allowing me to test 4 different sensors and leading me to the right result.
Nope, not the sensor tested it on the multimeter and on one of Ross's zeds and it was fine. Tested the connector on the meter and was ok, then I bridged the fitting and got a zero read. Pulled back the sheath and found a lose wire (the return), so simple in the end which is a relief, as I was starting to panic.
I see... That's what happened to me recently on the dyno, but it was a injector connector. It's good when you get to the bottom of it, specially when it's a easy fix