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*sigh*
The cruise control in your Volvo consists of several discrete components, and several major components. The major components are the controls (the switch and the button), the vacuum pump, and the ECU (Electronic Control Umbrella).
The vacuum pump is bolted to the bottom of the battery tray. I'd remove the battery, pull up that tray, pull off the vacuum hose (the one that DOSN'T just loop back) and suck on it while looking at the throttle drum. If it is difficult and the drum (eventually) starts to move, then the hoses and such are good, which is good!
My next step was testing the pump. The pump is really a pair of units... a motor and a solenoid. The motor creates a vacuum and pulls the gas pedal down. The solenoid releases the vacuum, and lets the pedal up. There is a valve on the brake pedal that also lets the vacuum out when you press the brake pedal.
I pulled it off an connected it to the yellow and black lines of an Apple IIe power supply. The motor ran, which was a good sign... however I was unable to get a vacuum with both of the "nipples" covered. I'm assuming this means my pump is bad.
However... to check to make sure it's not electrical, connect a pair of test lamps to the motor pins and the solenoid pins, and run them to the windshield so you can see them blinking while driving. Pressing SET with the switch ON should result in the motor running at least.
I'll be working on mine within the month, so I should have better documentation and of course... pictures.
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| -- | Lucyen Gabbard
96 854 Turbo 90k / 86 745 GLE 240k |
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