Important: The following steps must be completed before using the symptom diagnostic tables.
• | There are not any DTCs set. |
• | The control modules can communicate via the serial data link. |
• | 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. |
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .
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. |