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E4OD goes to limp mode.
having trouble with OD light flashing, when truck first starts up the OD light cannot be activated by pressing the button. The light comes on only after the truck holds 1st gear without shifting and then OD light flashes in limp mode. I have been searching the posts as the speedometer and odometer do not work. I have changed the VSS in rear axle housing and unplugged and reconnected the dash cluster without any improvement.Can anyone tell me if there is a fuse or relay that might need to be checked or if the problem could be in the OD switch as it is damaged. Curious as to which circuit powers the tranny module. What else can I check and would anyone have the schematic for the truck, It's a 93 F450 IDI, no turbo. When you shut the truck down it seems to reset until you actually drive again. I have not been driving in this condition other than a couple of hundred yard on my street to trouble shoot and test. I had a problem with a short in the fuel heater blowing maxi fuse so I disconnected that for now, could this cause the loss of speedo and odometer? please help.
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