I'm not sure what a failed modulator will do.
That should be either the kick down switch or NNS/backup light switch, as that's all the electrical devices I'm aware of.
I understand a failed kick down switch will not allow the transmission to shift into fourth gear.
I don't think I helped, but you're welcome anyway. I'm sure, hopefully you'll soon find the problem.
__________________
83 SD
84 CD
|