underthesun1020 Posted December 13, 2006 Report Share Posted December 13, 2006 I have a 2000 deville dts with the 300hp motor and i just had it replaced and the only code it sends is a p0118 code that is cts high voltage. Has anybody heard of this problem and how do i fix it, by the way the gauge in the cluster isn't reading anymore it just stays on cold. I replaced the sensor but it is still doing the same thing. can anybody weigh in on this. thanks Link to comment Share on other sites More sharing options...
JimD Posted December 13, 2006 Report Share Posted December 13, 2006 When you replaced the sensor, did you double check the connector on the chassis wiring? And double check the remainder of the harness that goes to the PCM? With an engine R&R there is a chance the wiring is pinched or otherwise damaged. The high voltage code usually means the circuit is open somewhere. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
Cadillac Jim Posted December 13, 2006 Report Share Posted December 13, 2006 A high voltage reading on the engine coolant temperature sensor usually means that it is disconnected. See if there is any voltage on the terminal at the sensor with the engine off, key on. If not, work bacward for an open circuit, which would be a loose connector or wire pulled partly or completely out of a connector, a cut or broken wire, etc. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
underthesun1020 Posted December 13, 2006 Author Report Share Posted December 13, 2006 with the key on i get 5 volts on each wire and what i have read and understand is that one wire is a constant 5 volts and the other will be less than that, it should read closer to 5 volts if it is cold and less volts when it gets hot. any other suggestions? Link to comment Share on other sites More sharing options...
JimD Posted December 13, 2006 Report Share Posted December 13, 2006 It is possible your "new" sensor is also failed. You should read some value of resistance across the sensor terminals; can't give you a value as it depends on temperature and I am unable to find a resistance vs. temperature chart for the sensor. If the sensor resistance changes when you change the temperature of the device, it is most likely working as intended. Guessing here, but if I saw resistance in the range of 500 Ohms to 3,000 Ohms, I would assume the sensor is not the problem. That leaves the connector(s) at the PCM. My wiring schematic says the ECT sensor is across PCM C2-18 and C2-33. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
underthesun1020 Posted December 16, 2006 Author Report Share Posted December 16, 2006 thanks i found the wires in the pcm harness and apparently the sending wire had been crimped a little too hard from the factory and was still in place but not making contact anymore to the pin into the pcm, so i repaired the wire and all is well now. thanks alot Link to comment Share on other sites More sharing options...
JimD Posted December 16, 2006 Report Share Posted December 16, 2006 Good job well done!! Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
billytheshoe Posted December 16, 2006 Report Share Posted December 16, 2006 It is entirely possible the coolant is contaminated with minerals and is "Charged" Could I be making this up? Link to comment Share on other sites More sharing options...
clarkz71 Posted December 16, 2006 Report Share Posted December 16, 2006 Yes. Link to comment Share on other sites More sharing options...
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