Set Speed Does Not Cancel When The Cruise Control Main Button Is Pressed

Set speed does not cancel when the cruise control main button is pressed

Check for PGM-FI DTCs Initial Inspection and Diagnostic Overview.

Do the cruise control combination switch test Service and Repair.

Do the cruise control input test Cruise Control (ECM/PCM) Input Test.
Test the cruise control main switch signal input.

Also check for

Short to power on the LT GRN wire