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'93 940 Cruise Control Randomly Cancels 900

Hey guys, been having an issue that's driving me crazy. I have replaced almost everything in the cruise control system, and I can't figure this out.

When I set the speed, it will hold it for a few minutes and then just cancel, and start decelerating.

When this happens, I CAN press and hold the set button and accelerate perfectly fine, indicating no vacuum leaks, I just can't reset the speed. I cant resume the speed, nothing. Only accelerate.

I have checked the whole system for vacuum leaks, it holds it perfectly. I've run the OBD for codes and I get 1-1-1 indicating no problem. I have run the OBD component test, and it returns all the codes it should.

I've pulled the vacuum bellow servo, its good. I have replaced the switch/stalk on the steering wheel. I have pulled the serviced the brake vacuum switch and its sealing perfectly/holding vacuum. the switch is adjusted so that it is closed when the pedal is rested.

All my brake lights work, I don't have a lamp failure indicator on the dash at all.

IDK where else to check. Is it possible the vacuum pump is faulty and is not holding the set vacuum like it should?






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New '93 940 Cruise Control Randomly Cancels [900]
posted by  sunapeelakers  on Tue Dec 29 13:33 CST 2020 >


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