GM Service Manual Online
For 1990-2009 cars only
Cruise Control Active: The scan tool displays Yes or No. The powertrain control module (PCM) monitors the cruise engaged signal circuit. The cruise control module provides a ground on the cruise engaged signal circuit when the cruise control system is active. An active cruise control system is displayed as Yes.

Cruise On/Off Switch: The scan tool displays On or Off. The PCM the monitors the cruise control on switch signal circuit. A closed switch is displayed as On.

Cruise Resume/Accel. Switch: The scan tool displays On or Off. The PCM the monitors the cruise control s resume/accel switch signal circuit. A closed switch is displayed as On.

Cruise Set/Coast Switch: The scan tool displays On or Off. The PCM monitors the cruise control set/coast switch signal circuit. A closed switch is displayed as On. The cruise control On/Off switch must be switched On in order to correctly view the Cruise Set/Coast Switch parameter.

Engine Speed: The scan tool displays 0 to 9,999 RPM. The PCM monitors the crankshaft position (CKP) signal circuit in order to determine the engine RPM.

Stoplamp Pedal Switch: The scan tool displays Applied or Released. The PCM monitors the stoplamp switch signal circuit. A closed switch is displayed as Applied.

Stoplamp Pedal Switch Signal: The scan tool displays Volts. This is the voltage at the stoplamp switch signal circuit, as monitored by the PCM.

Traction Control Status: The scan tool displays Active or Inactive. When the PCM receives a class 2 signal from the Electronic Brake Control Module (EBCM) requesting a traction control related function, the scan tool displays Active.

Vehicle Speed Sensor: The scan tool displays 0 to 150 km/h (93.2 mph). The PCM monitors the vehicle speed sensor signal circuit in order to calculate the vehicle speed for display.