The overdrive on a 1988 Toyota R22e pickup carrying a Wiinebago does not work above 4000 feet altitude, according to the owners manual and my experience. How can I modify the pickup automatic transmission overdrive so that it works above 4000 feet altitude?
On long flat roads above 4000 feet, I have to keep speed 40-50 to not race the engine. Here the engine has plenty of power to run 60 mph without taxing either the engine or the transmission.
I've seen this thread somewhere- You need to check the CTS/VSS/TPS sensors operation to include the No.3 solenoid. The 3-sensors has to feed the ECT computer the proper signal in order for the overdrive to function properly.
October, 20, 2006 AT 8:33 AM
Perhaps the wire to the overdrive solenoid, which runs from the overdrive relay, can be controlled by a switch that the driver controls. That may be all that is needed.