System Description

When the CRUISE button is pressed, a reference voltage at the gauge control module is grounded through G501, and the Cruise control main switch Indicator illuminates. With the shift lever in D or S, a path to ground is provided to the PCM, and the cruise control system can be set. When the DECEL SET button is pressed, a reference voltage signal is sent to the gauge control module and the cruise control system is activated.

The gauge control module communicates the set signal via multiplex communication lines to the PCM. Using the vehicle speed input obtained from the output shaft (countershaft) speed sensor, the PCM sends signals to, and receives signals from, the TP sensor/throttle actuator. The throttle plate opens and closes to maintain the set vehicle speed. When the brake pedal is pressed, a battery voltage input is sent to the PCM through fuse 13 (in the under-hood fuse/relay box), and the battery voltage input through fuse 18 (in the driver's under-dash fuse/relay box) is removed from the PCM. The cruise control system is deactivated when the brake pedal is pressed. The PCM communicates the brake pedal pressed information via multiplex communication lines to the gauge control module.

When the RES ACCEL button is pressed, a reference voltage signal is sent to the gauge control module, and the cruise control system is reactivated to the previously set speed. When the CANCEL button is pressed, two reference voltage signals are sent to the gauge control module, and the cruise control system is deactivated. It is necessary to accelerate the vehicle to speeds above 25 mph to set the cruise control system.

Refer to the CRUISE CONTROL SYSTEM for specific tests or troubleshooting procedures.