Description
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 .
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications |
Does the scan tool communicate with the powertrain control module? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |
3 | Select the BCM and PCM display DTCs function on the scan tool. Does the scan tool display any DTCs? | Go to Step 4 | |
4 | Does the scan tool display any DTCs which begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 5 |
5 | Does the scan tool display DTC B1000? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 6 |
6 | Does the scan tool display any DTCs that begin with a "C"? | Go to Diagnostic Trouble Code (DTC) List in Antilock Brake System | Go to Step 7 |
7 | Does the scan tool display DTC P0567, P0568, P0571? | Go to Step 8 | |
8 | Does the scan tool display any DTCs which begin with a "P"? | Go to Diagnostic Trouble Code (DTC) List in Engine Controls-4.3 L, Diagnostic Trouble Code (DTC) List in Engine Controls-4.8,5.4,6.0 L, Diagnostic Trouble Code (DTC) List in Engine Controls-6.6 L or Diagnostic Trouble Code (DTC) List in Engine Controls-8.1 L |
