auto shift problems
Discussion in 'Trucks [ Eighteen Wheelers ]' started by 2oooKW, May 13, 2011.
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i will have to try that and everything on top of that tranny is a pain to work on
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Hi There,
I am new here and this is my first post. I own a gearbox and differential company in South Africa and may be able to offer some advise on the problems you are experiencing.
I have come across this problem before and can point you in the right direction. The flashing "F" without the usual presence of a fault code is related to a current or previous speed sensor failure.
What usually happens is the sensor will crack and eventually break, normally logging a fault code 58.
The magnet in the sensor comes out and lodges between two raised sections of the tone wheel. A new sensor is fitted to rectify the fault and the magnet does not get removed off the tone wheel. This now affects the new sensors ability to give an accurate reading as it is affected by the magnet on the tone wheel.
Attached images show what i am talking about. The magnet is pretty small, but it can pick up a 1" spanner.
Another possibility could be a loose gearbox yoke nut. If the yoke nut is loose, this will allow the tone wheel to spin, as it will no longer be clamped between the output bearing and the yoke. A loose tone wheel will also give incorrect readings for the sensor.
Get the guys to check for those and let me know what they find.
Hope this helps.
Attached Files:
kvw trucking, DudleyBoyNC, Neverready and 2 others Thank this. -
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Awesome tip!!! Thanks!
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Hey guys I had issues with my 07 international 9400 2 pedal autoshift. 2nd time already that it reads F and it won't do anything. Deal charged me a fortune to not fix sh#t. Come to find out all I needed was to replace a bad battery! Hope this helps anyone with the same issue. Good luck guys
BoxCarKidd Thanks this. -
Have 2008 freighliner with 10 speed autoshift
Trany stop working on freeway do to electric problem
When trying to start engine trany wouldn't show neutral on display
When turn key on start position display light will come on and in 4-7 seconds, instead of show neutral, simply will get dark -
Same s*** whats going on with my assign volvo daycab with that junkshift. Its been nearly a year since it was new. Poorly speced truck. Too much tecnology crap installed. had already 9 issues to the auto. Elog will say that im going 111 mph when I am idling to keep my ac running.
Oxbow Thanks this.
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