Symptom Chart

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Action
The speed control is inoperative - no flash codes	Wiring, terminals or connectors Speed control switches Clockspring Throttle body linkage Speed control cable Stoplamp switch Speed control deactivator switch Stoplamp bulbs Transmission range (TR) sensor (automatic transaxle) Clutch pedal position (CPP) switch (manual transaxle) Speed control actuator Smart junction box (SJB) PCM	Go to Pinpoint Test A .
The set speed fluctuates	Accelerator cable Base engine concern Speed control cable Speed control actuator PCM	Go to Pinpoint Test B .
The speed control does not disengage when the brakes are applied	Wiring, terminals or connectors Obstructions to the accelerator pedal or linkage Stoplamp switch Speed control deactivator switch Speed control cable Accelerator cable Speed control actuator	Go to Pinpoint Test C .
The speed control does not disengage when the clutch is applied	Wiring, terminals or connectors Obstructions to the accelerator pedal or linkage CPP switch Speed control cable Speed control actuator Accelerator cable PCM	Go to Pinpoint Test D .
A single speed control button is inoperative	Speed control switch Speed control actuator	Go to Pinpoint Test E .
Self-test will not start or complete after multiple attempts	Wiring, terminals or connectors Speed control switch Speed control actuator	Go to Pinpoint Test A .
Flash Code 0 - no flash after last switch pressed	Wiring, terminals or connectors Speed control switch	Go to Pinpoint Test E .
Flash Code 1 - flash with last switch pressed, but no dynamic pull occurs at the throttle and the speed control is inoperative	Speed control cable Speed control actuator	Go to Pinpoint Test F .
Flash Code 1 - flash with last switch pressed, dynamic pull occurs at throttle and the speed control is inoperative	Fuse Wiring, terminals or connectors Speed control switches Clockspring Throttle body linkage Speed control cable Stoplamp switch Speed control deactivator switch Stoplamp bulbs TR sensor (automatic transaxle) CPP switch (manual transaxle) Speed control actuator SJB PCM	Go to Pinpoint Test A .
Flash Code 2 - stoplamp switch circuit failure	Wiring, terminals or connectors Stoplamp switch Stoplamp bulbs Speed control actuator	Go to Pinpoint Test G .
Flash Code 3 - speed control deactivator switch circuit failure	Fuse Wiring, terminals or connectors Speed control deactivator switch Speed control actuator SJB	Go to Pinpoint Test H .
Flash Code 4 - clutch/neutral switch circuit failure	Wiring, terminals or connectors CPP switch (manual transaxle) TR sensor (automatic transaxle) Speed control actuator PCM	Go to Pinpoint Test I .
Flash Code 5 - speed control actuator internal failure	Speed control actuator	INSTALL a new speed control actuator. REFER to Speed Control Actuator . TEST the system for normal operation.
The speed control drops out when pressing buttons	Wiring, terminals or connectors Speed control switch	Go to Pinpoint Test E .
The speed control drops out when pressing 2 or more buttons simultaneously	Normal condition	ADVISE the customer that when 2 buttons are pressed simultaneously, the speed control system enters a stand-by mode. Pressing RESUME returns the vehicle to the memory speed.
The speed control is hard to set	ON switch and SET + switch operation	ADVISE the customer that the ON switch must be pressed and released before the SET + switch is pressed.
The vehicle does not slow down after deactivating the speed control	Base engine operation	CHECK for service bulletins related to engine calibration and REPAIR if required. The speed control system does not control the vehicle speed when deactivated. ADVISE the customer the brakes must be applied to slow the vehicle.
The speed control is inoperative when towing a trailer	Aftermarket trailer tow wiring harness	ADVISE the customer that the factory trailer tow wiring harness must be used.
The speed control indicator lamp is never/always on	Wiring, terminals or connectors Speed control actuator Instrument cluster (IC)	REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.