why does the transmission shift fuse keep blowing on my 2000 ford taurus.
by Visitor in Mountainair, NM on January 11, 2011
To accurately answer your question, I need to understand your concern. There is no "shift fuse". Do you mean shift indicator or is your vehicle not upshifting? This vehicle is equipped with an electronic valve body which is commanded by the PCM. Do you mean the solenoid body power source?
My vehicle is not upshifting.The fuse/relay location # that keeps blowing is 28 in the power distribution box.
According to the owners manual, that appears to be a 15 amp fuse that covers the following components:
HEGO Sensor, Transmission Shift Solenoid, Canister Vent, A/C Clutch Relay, Thermactor Bypass Solenoid
You do not necessarily have an internal shift solenoid or transmission wiring harness issue -- although you may. You could have an oxygen sensor or wiring issue (HEGO), Canister Vent issue, AC clutch relay issue or thermactor bypass solenoid issue. I would recommend disconnecting all the other components one at a time - then replace the fuse and road test. If at the end you have all those components off line, and the fuse still blows you know you are dealing with a transmission harness or internal issue with the solenoids, etc.
Naturally, if you disconnect some of this, check engine warnings and so forth will come on (if they have not already...after all the fuse has blown...)...just keep doing your narrowing down of the concern and you will reach your answer.
Thanks DaveJHM, Thats what I will do. I will disconnect all those components one at a time and road test. Hopefully we can figure this out. I will let you know how it went.