With the Cruise Control Main Switch Turned ON, and Set Speed Temporarily Canceled By Pressing the Clutch Pedal)

Set speed does not resume when the resume/accel button is pressed (with the cruise control main switch turned on, and set speed temporarily canceled by pressing the clutch pedal) (M/T model)

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

Check the clutch pedal position switch B adjustment .

Do the cruise control combination switch test Service and Repair.

Do the cruise control input test Cruise Control (PCM) Input Test.
Test the resume/accel switch signal input.
Test the clutch pedal position switch B signal input.

Also check for

Open circuit loose or disconnected terminal: LT BLU, GRY wire

Also check for

Faulty clutch pedal position switch B