Circuit Description

The electronic cruise control is a speed control system. The system maintains a desired vehicle speed under normal driving conditions. Steep gradients may cause variations in the selected speed. The electronic cruise control system is capable of performing the following functions:
^ Cruise
^ Coast
^ Resume speed
^ Accelerate
^ Tap-up
^ Tap-down

The cruise control system uses a cruise control module assembly in order to obtain the desired cruise operation. The following 2 components in the module are primarily responsible for performing this operation:
^ An electronic controller
^ An electric stepper motor

The controller performs the following functions:
^ Monitor the vehicle speed
^ Operate the electronic stepper motor

The motor moves a band and throttle linkage in response to the controller. This action maintains the desired cruise speed. The cruise control module assembly contains a low speed limit. The low speed limit prevents system engagement below 40 km/h (25 mph). Functional control switches on the multi-function turn signal lever operate the controller. The cruise control is in a standby disabled mode until all conditions inconsistent with cruise control operation are cleared.

Battery voltage is applied or present under the following conditions:
^ With the ignition switch in RUN, the battery voltage is applied to terminal F of the cruise control module.
^ When the slider switch is moved to the ON position, the battery voltage is applied to terminal A of the cruise control module connector.
^ If the brake pedal is not depressed, the battery voltage is present at module terminal D.
^ If the brake pedal is depressed, the battery voltage is present at module terminal G.

The following conditions are present during cruise control operation:
^ Terminal G must have current flow for the cruise control to operate (disable) properly.
^ When the slider switch is moved to the RESUME/ACCEL position, the battery voltage is applied to terminal C of the module.
^ With the set switch depressed, the battery voltage is present at module terminal B.
^ The cruise control module connector terminal K is the speed signal terminal.
^ During operation, voltage oscillates between a high that is equal to the battery voltage and a low of 0.5 volts.
^ Ground is at the module terminal E.
^ The module terminal J signals the powertrain control module (PCM) when the cruise control engages. The PCM determines the correct shift pattern for the transmission.
^ The PCM uses terminal H in order to inhibit the cruise control when the conditions are not consistent with the cruise control. The PCM will inhibit the cruise control under the following conditions:
- The engine is off.
- The automatic transmission is in PARK or NEUTRAL.
- The manual transmission is out of gear (in NEUTRAL).
- There is a high engine RPM (fuel cut-off).
- There is a high vehicle speed (fuel cut-off).
- The PCM sets certain DTCs or other failure records.