Overdrive Cancel Function Inoperative

NOTE: Symptoms of inoperative overdrive cancel function include:

When cruise control is set and transmission is in overdrive, overdrive is canceled and it is not possible to shift back into overdrive.
Overdrive will not be canceled, even if actual speed is 4 MPH lower than set speed (set speed cannot be maintained).
Overdrive will not be canceled, even if accelerator switch is on.

Perform OVERDRIVE CANCEL CIRCUIT (A/T) test under TESTING. If overdrive cancel circuit is okay, replace cruise control module.