Diagnostic System Check - Cruise Control
DIAGNOSTIC SYSTEM CHECK - CRUISE CONTROLDESCRIPTION
The Cruise Control Diagnostic System Check is an organized approach to identifying a condition created by an electronic control system failure. The Diagnostic System Check directs the service technician to the next logical step in diagnosing the concern. Understanding the system, the table, and using it correctly, reduces diagnostic time and prevents misdiagnosis. For a review of the cruise control system, refer to Cruise Control Description and Operation (4.3L) Cruise Control Description and Operation (4.8L, 5.3L, 6.0L, and 8.1L) Cruise Control Description and Operation (6.6L).
TEST DESCRIPTION
Steps 1-3:
Steps 4-6:
The numbers below refer to the step numbers on the diagnostic table.
2. Lack of communication may be due to a malfunction in the class 2 serial data circuit. The specified procedure will determine the particular condition.
5. The presence of DTCs which begin with "U" indicates that some other module is not communicating. The specified procedure will compile all the available information before tests are performed.