Yesterday as I was trying to get home from work I was traveling about 40-45MPH and decided to hit the O/D off button to keep the truck from locking up before a hill with traffic on it. When I did that I lost the Tach and ALL of the lights on the dash flashed and then went off. The speedo, volt meter, oil pressure etc. still work but now I have no tach at all. To make matters worse, it seems that the thing did lock the torque converter or something because it feels REALLY sluggish when trying to take off. I did manage to get the truck about a mile and a half to the house but even after checking all the fuses and resetting the ECM by unplugging the battery I have no tach and I'm sure it's stuck in lock mode or something. Since the diesel has no ignition coil, where does it get it's signal for the tach and if this sensor dies will it cause the ECM to freak the tranny out? Any help is appreciated as this truck is my daily driver!

 

there is a throttle pos sensor on the throttle linkage. The tach sensor is on the timing cover it reads off the damper.

 

yeah that's kinda where I was heading with this, guess I should check that first.

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Just in case anyone else sees something similar, the crank sensor wires were cut by the belt! Easy fix, stupid move on my part I guess! Thanks!

 

wow, glad you got her fixed