Vacuum Switch B
- Disconnect hose No. 7 to control box at the vacuum hose manifold. Connect a hand vacuum pump to the hose. Apply vacuum to switch.
- On Accord models, check for continuity between Black/Yellow and Blue/White (Accord) or Black/Yellow and Gray (Prelude) wires at control box connector. Continuity should be present when a vacuum above 1.2 in. Hg is applied. No continuity should be present when vacuum is released.