For 1990-2009 cars only
Important: The following steps must be completed before using the symptom diagnostic tables.
- Before using the symptom diagnostic tables, perform the Diagnostic System Check - Vehicle in order to verify the following conditions:
- Review the system operation in order to understand the system functions. Refer to Cruise Control Description and Operation .
| • | There are not any DTCs set. |
| • | The control modules can communicate via the serial data link. |
Visual/Physical Inspection
| • | Inspect for aftermarket devices which could affect the operation of the cruise control system. Refer to Checking Aftermarket Accessories . |
| • | Inspect the easily accessible or visible system components for obvious damage or for conditions which could cause the symptom. |
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .
Symptom List
Refer to one of the following symptom diagnostic procedures in order to diagnose the symptom:
| • | For all Caterpillar engines, refer to the Caterpillar Diagnostic Information. |
