Electronic cruise control is a speed control system. The
system maintains a desired vehicle speed under normal driving conditions.
Steep grades up or down may cause variations in the selected speeds. The
electronic cruise control system is capable of performing the following functions:
The cruise control system uses a cruise control module assembly in order
to obtain the desired vehicle cruise operation. The following two important
components in the module help in order to perform this operation:
| • | An electronic controller |
| • | An electric stepper motor |
The controller performs the following functions:
| • | Monitors the vehicle speed |
| • | Operates 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 a minimum of 40 km/h (25 mph). Functional
control switches on the multi-function turn signal lever control the operation
of the controller. The cruise control is in 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 will oscillate between a high that is
equal to the battery voltage and a low of 0.5 volts. |
| • | Ground is at module terminal E. |
| • | Module terminal J signals the Powertrain Control Module
(PCM) when 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 automatic transmission is in PARK or NEUTRAL. |
| - | The manual transmission is out of gear (in NEUTRAL). |
| - | There is high engine RPM (fuel cut-off). |
| - | There is high vehicle speed (fuel cut-off). |
| - | The PCM sets certain DTCs or other failure records. |
