PCM Controlled SMCC Cruise Control

Diagnostic Chart:

DESCRIPTION
This powertrain has a Stepper Motor Cruise Control (SMCC) system which closely approximates a stand alone system, except that the SMCC relies on the PCM to indicate that cruise control is allowed and then signals the PCM when engaged. This is accomplished by using a two wire link between the PCM and SMCC. These are called the Cruise Inhibit and the Cruise Engaged circuits. If the PCM will allow operation, refer to the Cruise Operation table, it signals the SMCC on the Cruise Inhibit circuit to allow cruise. Once cruise is engaged by the driver, the SMCC will continuously signal to the PCM that cruise is engaged using the Cruise Engaged circuit.

Refer to Cruise Control for information regarding the cruise system not related to PCM interaction.

OPERATION
The stepper motor cruise control module sends the cruise status input to the PCM to indicate when cruise control is engaged.

The PCM monitors the cruise status signal while commanding cruise to be disengaged via the cruise inhibit circuit. Any of the following conditions may cause the PCM to inhibit cruise control operation:

^ Engine not running long enough for cruise control operation.
^ Transaxle range inputs indicate park, neutral, low, or reverse gear selected.
^ Engine speed is too high or too low.
^ Vehicle speed is too high or too low.
^ Traction is active.
^ Vehicle acceleration or deceleration rate is too high.