Problems with the
shift-up light coming on 5th gear can be traced to a bad 5th gear/reverse switch
on the back of the transmission. If the transmission was recently serviced
(i.e. clutch job) or engine removed, the wires could've been damaged or pulled
off of the sensor. The sensor is relatively cheap and easy to replace once
you get under the car.
A working 5th gear/reverse switch would signal
the ECU to not trigger the shift-up light after 2,200 RPMs.
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