Question about 1994 Jeep Grand Cherokee
From what I understand the switch bypasses part of the od circut to delay od function slightly in order to eliminate going in and out on hills. I have several conflicting diagrams which show a control module (sometimes). With this limited info, I'd take the cheapest way possible in making a "guess repair", by changing the switch, which may not be making good connection in one position.Other than that, you will need to find a better set of diagrams than I have before going further. In any case, from what youv'e said, I don't believe it's a trans/converter problem but an electrical one.
Posted on Mar 03, 2009
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Start by checking the least expensive items:
Make sure you are not activating the O/D switch in the shift stick inadvertently.
Look at the display panel, if the "Eng" light is on, you must get the code and repair the affected item. If you have knock sensors and/or oxygen sensors malfunctions that may prevent the transmission from shifting to O/D.
Check the ground cables located in the engine compartment, especially the ones behind the air intake manifold. If they are loose or broken it affects the ECU (car computer) and causes the transmission to work erratically. If they become disconnected it may burn the ECU and shut down the car.
Now going to more profound mechanics, it could be a sticking shift solenoid valve, your RX300 transmission have five of those located were the transmission oil strainer (filter) is. It can also be an ECU malfunction and/or related to the wiring from the ECU to the transmission connectors.
Always start from the least expensive and recheck the obvious. Good luck.
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