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Home › Honda › 1987 › Prelude Base, Automatic › Repair and Diagnosis › Engine Performance › System › Spark Control System › Component Testing › Vacuum Switch C › Auto. Trans.

Auto. Trans.

  1. Disconnect vacuum hose No. 15 to vacuum switch C and connect vacuum pump to hose. Apply vacuum to switch. Check for continuity between Black/Yellow and Blue/Black wire terminals of control box 6P connector. Continuity should be present when vacuum is released, replace vacuum switch C and retest.
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