For 1990-2009 cars only
Scan Tool Data Definitions Cruise Control
Scan Tool Data Definitions
The Scan Tool Data Definitions contains a brief description of the Cruise Control System related parameters available on the scan tool.
ACC Gap Switch: The scan tool displays Inactive/ Increase/ Decrease/ Error. The body control module (BCM) monitors the gap adjustment switch signal circuit. This is the state of the ACC gap switch as detected by the BCM.Clean Radar Indicator Message: The scan tool displays On / Off. This is the state of the clean radar indicator message as commanded by the distance sensing cruise control (DSCC) module.
Cruise Cancel Switch: The scan tool displays Active/ Inactive/ Invalid. This is the state of the cruise cancel switch on/off switch as detected by the ECM.
Cruise Control Active: The scan tool displays Yes / No. The ECM determines the current operational status of the cruise control system. An operating cruise control system is displayed as Yes.
Cruise Control Switch: The scan tool displays Off / On / Invalid / Resume / Set. The instrument panel module (IPM) monitors the cruise control set/coast and accel/resume switch signal circuit in order to determine the status of the cruise control switch. The IPM sends a serial data message to the ECM indicating the status of the cruise control switch.
Cruise Disengage (1-8) History: The scan tool displays the last 8 reasons why the ECM disengages the cruise control system. Refer to the Scan Tool Data Definitions (Disengage History - ECM) for the disengage reasons description.
Cruise On/Off Switch: The scan tool displays On / Off. This is the state of the cruise control On/Off switch as detected by the ECM.
Cruise On / Off Switch Status: The scan tool displays On / Off. This is the state of the cruise on / off switch as detected by the DSCC module.
Cruise Resume/Accel. Switch: The scan tool displays Active/ Inactive/ Invalid. The ECM receives a GMLAN serial data message from the IPM indicating the status of the cruise control accel/resume switch. An active cruise control accel/resume switch is displayed as On.
Cruise Set/Coast Switch: The scan tool displays Active/ Inactive/ Invalid. The ECM receives a GMLAN serial data message from the IPM indicating the status of the cruise control set/coast switch. An active cruise control set/coast switch is displayed as On. The cruise control On/Off switch must be On to view the Cruise Set/Coast Switch parameter correctly.
Driver Selected Speed: The scan tool displays km/h (mph). This is the driver selected set speed as monitored by the ECM.
Driver Throttle Override Status: The scan tool displays Active / Inactive. The ECM monitors the throttle and reports a throttle override condition initiated by the driver.
Engine Speed: The scan tool displays 0-9999 RPM. This is the engine RPM as monitored by the ECM. The ECM monitors the CKP signal circuit in order to determine the engine RPM.
Follow Speed: The scan tool displays km/h (mph). This is the following speed as determined by the DSCC module.
HUD Virtual Device: The scan tool displays Present / Not Present. This is the state of the HUD as determined by the DSCC module.
Ignition 1 Signal: The scan tool displays 6 volts to 18 volts. The ECM monitors the Ignition 1 signal circuit in order to determine the system voltage.
Service Radar Indicator Message: The scan tool displays On / Off. This is the state of the service radar indicator as commanded by the DSCC module.
Target Found this Ignition Cycle: The scan tool displays Yes / No. The FLS radar scans the road environment to detect the presence of a vehicle in its path. Yes is displayed if a target is acquired.
Vehicle Ahead Indicator Message: The scan tool displays On / Off. This is the state of the vehicle ahead indicator as commanded by the DSCC module.
Vehicle Speed Sensor: The scan tool displays 0-255 km/h (0 to 155 mph). The ECM monitors the vehicle speed sensor signal in order to calculate the vehicle speed for display.
Scan Tool Data Definitions Disengage History
One of the following conditions must be present in order for a disengagement parameter to appear:
| • | The Cruise Control System is active and disengagement is requested. |
| • | The engagement of the Cruise Control System is requested while a fault is present. |
ACC Data: The ECM detects that there was an error in the GMLAN signal from the distance sensing cruise control (DSCC) module. This disengagement reason sets if there was either an error in the population of the rolling count and protection value signals in the DSCC, or if there was an error in the processing of those signals in the ECM.
ACC Option: The ECM detects that there is a cruise control configuration conflict between the ECM and the body control module (BCM). This disengagement reason sets if either the ECM or BCM is calibrated for conventional cruise control and the other module is calibrated for adaptive cruise control.
Accel Rate: The ECM detects that the vehicle acceleration is greater than the calibrated cruise control threshold.
APP Override: The ECM detects that the accelerator pedal overrides the set vehicle speed for approximately 60 seconds.
Brake: The ECM detects that the stop lamps have been activated according to the brake pedal position (BPP) sensor / stop lamp switch input from the platform module. Also, the brake pedal being applied according to the brake fluid pressure sensor input can also set this disengagement reason with vehicles equipped with the vehicle stability enhancement system (VSES).
BPP Data: The ECM detects an invalid brake pedal apply serial data message from the platform module.
BPP DTC: The ECM detects that DTC P0703 is active.
Cancel: The ECM detects that the cruise control cancel switch has been activated.
Clutch: The ECM detects that the clutch pedal switch has been activated.
Coast Disengage: When the ECM detects that the cruise set/coast signal is active and the throttle blade fully closes the cruise control system will disengage until the ECM detects that the set/coast signal is inactive. The cruise control system will then engage and set with the new vehicle speed.
Coast Speed Low: The ECM detects that the Set/Coast switch is activated until the vehicle speed is below 37 km/h (23 mph).
Cruise S/W: The ECM detects that a cruise control software execution error is present.
Cruise Sw Data: A fault in the serial data circuit from the cruise control switch to the platform module is detected.
Cruise Sw. Off: The ECM detects that the cruise On/Off switch was turned to OFF when the cruise control system was enabled.
D Whl Spd Low: The ECM detects the driven wheels are at a slower speed than the non-driven wheels.
D Whl Spd Hi: The ECM detects the driven wheels are at a faster speed than the non-driven wheels.
Decel Rate: The ECM detects that the vehicle deceleration is greater than the calibrated cruise control threshold.
DLC Override: The ECM detects that a DLC override has occurred.
DTC Set: The ECM detects that a DTC has been set which affects the cruise control operation.
ECM Inhibit: The ECM detects a RAM corruption associated to the cruise control system.
ECT Overtemp: The ECM detects the engine temperature is above the calibrated threshold.
Engine Run Time: The ECM detects that the cruise control system has been requested and the engine run time counter is not active.
Engine Speed: The ECM detects that the engine speed is less than or greater than a calibrated RPM.
First Gear: While the cruise control system is active, the ECM detects that the transmission is in Drive 1.
High Speed: The ECM detects that the vehicle speed is greater than the calibrated amount.
High Voltage: The ECM detects that the ignition voltage is above 16 volts.
Illegal Mode: The ECM detects that the acceleration mode is active without the activation of the Accel. switch.
Lost Fwd Gear: The ECM detects that transmission is in Neutral, Reverse or Park.
Low Speed: The ECM detects that the vehicle speed is less than 37 km/h (23 mph) while the cruise control system was enabled.
Low Voltage: The ECM detects that the ignition voltage is below 9 volts.
Memory DTC: The ECM detects an internal memory fault.
MPH Limit: The ECM detects the vehicle is over speed and that the fuel shutoff has been activated.
None: This parameter is displayed when a new ECM has been installed.
Over Set Speed: The ECM detects the current vehicle speed is greater than the set vehicle speed by more than a calibrated amount.
Park Brake: The ECM detects the park brake switch is active.
Pedal Initialize: The ECM detects that a stop lamp pedal activation had not occurred before the cruise control system was requested.
PTO Active: The ECM detects power take off is active.
RPM Limit: The ECM detects the engine is over speed and that the fuel shutoff has been activated.
S/C On - Speed High: The ECM detects the Set/Coast switch is briefly applied while the current vehicle speed is greater than the set vehicle speed by more than a calibrated amount.
Simul SC/RA Sw: The ECM detects that the Set/Coast switch and the Resume/Accel switch are active at the same time.
Sw Invalid: The ECM detects the analog cruise control switch input is out of the normal voltage range.
TAC Inhibit: The ECM detects a fault within the Throttle Actuator Control (TAC) System.
TCS: The ECM detects that the traction control system had been activated. It is also possible that a tire with low air pressure can also set this disengagement reason.
Trans. DTC: The ECM detects a transmission gear fault.
Under Set Speed: The ECM detects that the vehicle speed is less than the cruise memory speed by more than a calibrated amount.
VSES: The ECM detects that the vehicle stability enhancement system had been activated.
