Truck has dia port a-d think its closed loop has o2 and resonator in line with vac to vaporizer.Cross out a and b light flashes fast at.5 est.5 volts from a to d crossed over to to vac 1 test sets at 5 no change when pedal mashed. vac 2 changes when hose unpluged.Removed vac 1 open no vac closed with vac As far as I got on testing.Vac 1 not to spec even with switch good any ideas
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