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Home >> Chevrolet >> 1984 >> Impala 3.8 A >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Testing >> Cruise Control Diagnosis

Cruise Control Diagnosis

  1. Check throttle linkage to servo for proper adjustment. If not okay, adjust. If adjustment is okay, check all electrical and vacuum connections for proper engagement. Check fuse.
  2. If fuse is not okay, repair as necessary. If fuse is okay, perform Servo Test as outlined in this article. If servo tests out as not okay, repair or replace. If servo is okay, perform Cruise Engagement Switch Test as outlined in this article.
  3. If engagement switch is not okay, adjust, repair or replace as required. If engagement switch is okay, perform Cruise Release Switch Test as outlined in this article. If release switch is not okay, adjust, repair or replace as necessary.
  4. If release switch is okay, perform Set/Coast Button Switch Test as outlined in this article. If set/coast switch is not okay, repair or replace. If set/coast switch is okay, perform Speed Sensor Test as outlined in this article. If speed sensor tests not okay, repair or replace. If okay, replace control module.
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