From the 06 LX service manual. I believe all of this is fed to the PCM throough the front control module as it is what collects and distributes the signals on the buss circuit. Now one thing I did find about the front controla module it it is capable of taking the signal directly from the wheel spped sensors on vehicles not equipped with ABS. Still working on figuring out all that info and how I can get it to work once I start on the wiring in the car. As for the dakota digital and figuring out the sensor you may want to try a pm to 5.7dart and he made his own tone rings to mount on the tailshaft of the trans to get the NAG unit working on his Barracuda.
SPEED CONTROL
DESCRIPTION
The speed control system is fully and electronically controlled by the Powertrain Control Module (PCM).
A cable
and a vacuum controlled servo are not used. This is a servo-less system. The switch is labeled: ON/OFF,
RES/ACCEL, SET, COAST, and CANCEL.
OPERATION
When speed control is selected by depressing the ON switch, the PCM allows a set speed to be stored in its RAM
for speed control. To store a set speed, depress the SET switch while the vehicle is moving at a speed between 25
and 100 mph. In order for the speed control to engage, the brakes cannot be applied, nor can the gear selector
indicating the transmission is in Park or Neutral or low.
The speed control can be disengaged manually by:
²
Stepping on the brake pedal
²
Depressing the OFF switch
²
Depressing the CANCEL switch.
NOTE: Depressing the OFF switch or turning off the ignition switch will erase the set speed stored in the
PCM (the ECM with a diesel engine).
For added safety, the speed control system is programmed to disengage for any of the following conditions:
²
An indication of Park or Neutral
²
A rapid increase rpm (indicates that the clutch has been disengaged)
²
Excessive engine rpm (indicates that the transmission may be in a low gear)
²
The speed signal increases at a rate of 10 mph per second (indicates that the coefficient of friction between
the road surface and tires is extremely low)
²
The speed signal decreases at a rate of 10 mph per second (indicates that the vehicle may have decelerated
at an extremely high rate)
Once the speed control has been disengaged, depressing the RES/ACCEL switch (when speed is greater than 20
mph) restores the vehicle to the target speed that was stored in the PCM (the ECM with a diesel engine).
While the speed control is engaged, the driver can increase the vehicle speed by depressing the RES/ACCEL
switch. The new target speed is stored in the PCM (the ECM with a diesel engine) when the RES/ACCEL is
released. The PCM (the ECM with a diesel engine) also has a 9tap-up9 feature in which vehicle speed increases at
a rate of approximately 1 mph for each momentary switch activation of the RES/ACCEL switch.
A tap down feature is used to decelerate without disengaging the speed control system. To decelerate from an
existing recorded target speed, momentarily depress the COAST switch. For each switch activation, speed will be
lowered approximately 1 mph.