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:
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 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. |
