I haven't seen exactly the same Cruise Control failure you describe, but
I've seen a few failure causes. My car with C.C. is an '86.
1) Multiple vacuum hoses help run the C.C. The main unit is on the
firewall in engine compartment, driver's side. Shaped like a cylinder
with one end rounded. Trace all the hoses in and out of it as far as
you can see, looking for leaks or bad rubber.
2) Oil or trans. fluid or brake fluid leaks spraying onto a sensor (??)
on the driveline. Old systems ahd a C.C. pickup sensor on driveshaft,
but I think these 240's use the same speedo sensor that feeds to the
speedometer. But look for messy slime down there anyway, it's good to
know about if you have it!
3) 3- (or 4??) wire harness going to the speedometer itself not clipped
on fully - even though speedometer is working! I had a rarely-working
C.C. for months. After I pulled the instrument cluster to change some
bulbs and had so had to remove and reattach that wire set, my Cruise
Control came back to life. Speedometer had been working perfectly,
giving me no clue that the problem was with the clip there. I'd clean
the male and female parts of the connector with electrical cleaner, and
maybe pinch the female part with pliers to make sure the contacts grip well.
4) Engine wire harness rotted away, causing a short or a wire break.
Not likely in a '92, but i suppose anything's possible.
Bruce Pick
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