Initial Inspection and Diagnostic Overview

1. Check vacuum hoses for leaks, kinks and restrictions, and the cruise control servo linkage for proper slack.
2. If system works except for tap-up and tap-down functions, replace cruise control module.

Check for a broken (or partially broken) wire inside of the insulation which could cause system failure bur prove "GOOD" in a continuity/voltage check (see "Diagnostic Aids").

Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems )see "Diagnostic Aids").