P1289 - Coolant temperature sensor reading out of self test range. :IE the sensor is either out from the original overheating that took out the engine or it is shorted or disconnected. That would cause the lack of temperature reading on the dash. Testing involves looking at the live data from the sensor on the scan tool and wiggling and tapping on the sensor to see if the voltage changes rapidly. Then proceeding up the wiring harness flexing and moving that as well.
U1073 and P1284 do not show up relative to the Mustang.
U1073 does show as a valid code on the V8 in the trucks. It reads that there is a failure in the coolant data system, which could mean the ECT is unplugged like the P1289 code indicates.
P1284 does show as injection control pressure failure on the power-stroke diesels though.
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Tuesday, September 12th, 2017 AT 12:10 AM