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The Mitchell CD says fuse 12.
I take it you've confirmed that the hose from the vacuum pump to the vacuum motor that drives the throttle cam is fine. (I know it kept falling off on my 940).
The vacuum test is a bit of a pain, so you may want to do the voltage checks at the bottom first.
Vacuum pump check:
- disconnect the hose connecting to the vacuum motor.
- run the disconnected hose back into the passenger compartment somehow, and connect a vacuum gauge to it (or just plug it with your finger, to test).
- engage cruise control, and see if you get a vacuum.
If you do get a vacuum, presumably your vacuum motor is gone (could check with a handheld vacuum pump).
Voltage checks (if you don't get a vacuum in above test):
- with the ignition on and cruise enabled on the steering column turn signal stalk sliding switch, check for +12 volts on the Yel-Red wire at the vacuum pump.
- make sure the brake switch (which disables cruise when you hit the brakes) is working. There should be +12 volts on the Org-Blk wire (pin 3) at the cruise computer when cruise is enabled
- driving the car, try to engage cruise with the button on the end of the stalk, and see if the voltage on the vacuum pump's Grn-Yel wire drops to near 0 volts. (I believe it's the Grn-Yel wire, but it could be the Org one).
If these tests pass, it's likely an issue with the Cruise computer, or the Grn-Yel wire isn't connecting to the vacuum pump properly.
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David Armstrong - '86 240(350k km?), '93 940T(270k km), '89 240(parts source for others) near Toronto
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