How does cruise control work on a LS-series PCM?
The TAC module is wired to a motor mounted within the throttle body assembly and uses PCM data to change throttle angle to maintain cruise control vehicle speed. The cable throttle cruise control module shown here also uses PCM data to maintain cruise control vehicle speed, but must manually pull the throttle linkage to change throttle angle.
How to disengage cruise control from throttle blade angle?
To disengage (but not disable) the cruise control module’s control of throttle blade angle, gently apply the clutch or brake pedal to momentarily remove 12V power from the cruise control module’s brake/clutch signal input. To disable cruise control, slide the cruise control on/off switch to the off position.
When do you disengage the cruise control module?
Disengaging Cruise Control: The cruise control module retains the set vehicle speed in its memory until it loses 12V power through the cruise control on/off switch or the vehicle’s ignition switch.
What kind of cruise control does a Vortec have?
You may choose from cruise control modules found in 1996- newer Vortec trucks and LS series vehicles. The cruise control module receives signals from several switches and, when necessary, takes control of throttle blade angle through a cable attached to the engine’s throttle body. Installation is rather simple.
The TAC module is wired to a motor mounted within the throttle body assembly and uses PCM data to change throttle angle to maintain cruise control vehicle speed. The cable throttle cruise control module shown here also uses PCM data to maintain cruise control vehicle speed, but must manually pull the throttle linkage to change throttle angle.
Disengaging Cruise Control: The cruise control module retains the set vehicle speed in its memory until it loses 12V power through the cruise control on/off switch or the vehicle’s ignition switch.
How does resume / Accel switch work on cruise control?
Sliding the resume/accel switch requests the cruise control module to take over throttle blade angle and accelerate the vehicle to the previously set vehicle speed. Sliding and holding the resume/ accel switch increases vehicle speed until the switch is released. The new vehicle speed is stored in the cruise control module’s memory.
What makes cruise control performance worse or better?
Making cruise control performance worse is an aged diaphragm that has developed a leak and no longer operates properly. Electronic throttle systems use a TAC module (right), while cable throttle systems use a cable-driven cruise control module (left).