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I would check the connectors as they get brittle and the wires will pull out. As the previous post said, put the CCU on full cold then check the voltage across the wires. If you are not getting 12V then you either have a wiring issue or the CCU is no good. if you remove the CCU, the monovalve wires are on the right side connector if I remember correctly. I did a continuity test and found one had an open. Fixed it and the monovalve worked again.
There are detailed posts on how to resolder the CCU if it needs it.
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