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91 240 Automatic Transimission Overdrive will not engage 200

posted by  Don Foster on  Mon Sep 22 09:41 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

The relay is under the right-central dashboard vent, usually hiding under a wiring harness and often clipped to a metal strut.

It is easily accessible by removing the glovebox and looking in and to the left.

The picture below shows the relay in my '82 245 -- it's blue, while yours is probably white.

Discard the metal clip. It cause damage.

Yopiu can remove the plastic relay housing to repair the circuit board.





Very often the solder connections in the relay fail (age, vibration, heat) and the relay becomes intermittent or dead. Resoldering can restore the relay to full function. $0, no risk, 15 minutes work, clean and easy job. If it helps nothing, you're out nothing.

Examine the relay carefully and be sure to look for a burned copper trace -- it sometimes burns when the solenoid wire becomes chaffed and touches ground. The pictures below show:

a) A relay with cracks.
b) The same relay with burned copper trace.
c) The same relay fully resoldered and repaired.









Also check the fuse.
--
Don Foster (near Cape Cod, MA)






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