System Description

When the main switch is pressed, a battery voltage input is removed from the gauge control module, and the cruise control main switch indicator LED illuminates. With the shift lever in D or S (A/T) or with the clutch pedal not pressed (M/T), a path to ground is provided for the device (A/T) or switch input (M/T) to the ECM/PCM. The ECM/PCM detects that the shift lever is in D or S (A/T) or the clutch pedal is not pressed (M/T) through this input, which enables the cruise control.

When the set switch is pressed, a voltage signal is sent to the gauge control module. The gauge control module grounds the cruise control indicator LED, illuminating it. The gauge control module communicates the set signal via multiplex communication lines to the ECM/PCM. Using the vehicle speed input obtained from the output shaft (countershaft) speed sensor, the ECM/PCM sends signals to and receives signals from the TP sensor/throttle actuator, which opens and closes the throttle to maintain the set speed.

When the brake pedal is pressed, battery voltage input is sent to the ECM/PCM through fuse 10 (Under-hood) and the battery voltage input through fuse 13 (Driver's Under-dash) is removed. The ECM/PCM communicates the brake pedal pressed information via multiplex communication lines to the gauge control module, which removes ground from the cruise control indicator LED, turning it off. The information is also used by the ECM/PCM to remove the cruise control system's control of the throttle.

When the resume switch is pressed, a voltage signal is sent to the gauge control module. The gauge control module grounds the cruise control indicator LED, illuminating it. The gauge control module communicates the resume signal via multiplex communication lines to the ECM/PCM. Using the vehicle speed input obtained from the output shaft (countershaft) speed sensor, the ECM/PCM sends signals to, and receives signals from, the TP sensor/throttle actuator, which opens and closes the throttle to resume and maintain the previously set speed.

When the cancel switch is pressed, two voltage signals are sent to the gauge control module. The gauge control module removes ground from the cruise control indicator LED, turning it off. The gauge control module communicates the cancel signal via multiplex communication lines to the ECM/PCM. The information is also used by the ECM/PCM to remove the cruise control system's control of the throttle.

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