Cruise Control Operation

WARNING: This page is about a different car, the 2015 Ford C-Max. However, it is still accessible from the selected car via links, so may be relevant.

The cruise control functions include:

turning on the cruise control system.
setting and maintaining the desired vehicle speed.
accelerating the vehicle speed.
coasting down to a lower speed.
resuming the prior vehicle speed.
turning off the cruise control system.

Hardwired inputs to the PCM are the BPP switch assembly (contains the stoplamp switch and cruise control deactivator switch) and the APP sensor.

Hardwired output of the PCM is the Electronic Throttle Body (ETB) command.

The vehicle speed is controlled by the PCM through the Electronic Throttle Control (ETC) subsystem.

The cruise control system provides self-diagnostics. Cruise control is disabled anytime an error is detected in the system. No IPC indicator or message center messages are displayed when faults occur. Fault codes are logged by the PCM or SASM.

An Electronic Throttle Control (ETC) system fault also disables the cruise control system. In this case, an Electronic Throttle Control (ETC) system powertrain malfunction (wrench) warning indicator is displayed.

Additionally, certain conditions cause the cruise control system to deactivate:

Transmission gear selector is placed into a position other than D or OD
Cruise control set speed is overridden with the accelerator pedal for a period longer than 5 minutes
Cruise control switch is pressed or stuck longer than 2 minutes
ABS fault