1. Connect a scan tool.
2. Turn the ignition switch to the ON position.
3. Inspect for any PCM diagnostic trouble codes (DTC's).

Are any DTC's found in the PCM, using the scan tool?

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Go to Diagnostic Trouble Code (DTC) List in Engine Controls

Go to Step 2

Perform the fault isolation test (REV test). Refer to Fault Isolation Test .

Does the cruise system operate correctly?

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System OK

Go to Cruise Control System Check