Northstar Engines and System Technical Discussion Discussion, 94 sls overheating,maybe... in Cadillac Engine Technical Discussion; I own a 94 sls that up until about 2months ago was great..The engine overheated (or so I thought ) ...
I own a 94 sls that up until about 2months ago was great..The engine overheated (or so I thought ) ,replaced the thermostat,flushed twice ,replaced temp. sensor(thanks for the location info) with no luck.I finally looked into the codes and noticed that po14 -shorted coolant temp sensor and po73 -intermittent coolant sensor signal were both in the history .I then ran a test and both of them came up .are they both pointing to the temp sensor ? where do I begin?
P014 - As sensor temp increases, resistance decreases. A high coolant temp will result in low signal voltage. Code P014 sets because engine coolant temp can't be greater than 296 when intake air is less than 212. The failure condition is when the coolant sensor value is greater than or equal to 298 for 2 seconds.
P073 - Sets when PCM detects a large change in sensor output voltage in a one-second period.