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.
BPP Status: The scan tool displays Learned / Unlearned / Invalid / Undecided. This is the status of the brake pedal position (BPP) sensor. A correctly calibrated BPP sensor will be displayed as Learned.Brake Pedal Signal Status: The scan tool displays Applied / Released. The engine control module (ECM) monitors the stoplamp pedal switch signal circuit and an active switch will display as applied.
Cruise: The scan tool displays 0-150 Counts. The instrument panel module (IPM) monitors the signal circuit of the cruise control switch. The listed values were taken from a known good cruise control switch. OFF=0 Counts / On=29 Counts / Resume=76 Counts / Set=148 Counts.
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 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 Inhibited: The scan tool displays Active / Inactive. This is the state of the cruise inhibit signal as determined by the ECM. When the ECM inhibits cruise control, the cruise inhibit signal is active.
Cruise Inhibit Reason: The scan tool displays the reason why cruise control is inhibited. The scan tool displays the last 8 recent reason why cruise control is inhibited.
Cruise Inhibit Signal Command: The scan tool displays On / Off. This is the state of the cruise inhibit signal command as determined by the ECM. When the ECM inhibits cruise control, the cruise inhibit signal command is On.
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 On / Off. 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 On / Off. 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: 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.
Initial Brake Apply Signal: The scan tool displays Applied / Released. The IPM monitors the signal circuit of the initial brake apply signal. When the ECM receives a GMLAN serial data message from the IPM indicated that the brake pedal has been applied, the scan tool displays Applied. The ECM must receive a GMLAN serial data message from the IPM indicated that the brake pedal has been applied before cruise control is engaged.
Moderate Brake Apply Signal: The scan tool displays Applied / Released. This is the state of the moderate brake apply signal as monitored by the ECM.
Parking Brake Switch: The scan tool displays On / Off. The IPM monitors the signal circuit of the parking brake switch.
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.
Stoplamp Pedal Switch: The scan tool displays Applied / Released. The ECM monitors the stoplamp pedal switch signal circuit. An activated brake pedal is displayed as applied.
Stoplamp Relay: The scan tool displays Applied / Released. The ECM monitors the stoplamp pedal switch signal circuit. An activated brake pedal is displayed as applied.
Stop Lamp Status: The scan tool displays On / Off. The IPM monitors the signal circuit of the brake pedal position switch. An activated brake pedal is displayed as On.
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.
Traction Control Status: The scan tool displays Active / Inactive. When the ECM detects that a condition exists for the traction control system to be activated, the scan tool displays Active.
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
The Cruise Control Scan Tool Definitions - Disengage History is a common list for all of the available cruise control disengagement definitions available on the scan tool. The cruise control system equipped on the vehicle determines which cruise control disengagement parameters are available on the scan tool.
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. |
Bad Sequence: The PCM/ECM detects that a cruise control software execution error is present.
Brake: The PCM/ECM detects that the stop lamps have been activated or the PCM/ECM detects that a stop lamp pedal activation had not occurred before the cruise control system was requested.
Cancel: The PCM/ECM detects that the cruise control cancel switch has been activated.
CC Sw. Position: The PCM/ECM detects that the acceleration mode is active without the activation of the Accel. switch.
Clutch: The PCM/ECM detects that the clutch pedal switch has been activated.
Clutch Switch: The PCM/ECM detects that the clutch pedal switch has been activated.
Cruise Off: The PCM/ECM detects that the cruise On/Off switch was turned to Off when the cruise control system was enabled.
Coast Low Speed: The PCM/ECM detects that the Set/Coast switch is activated until the vehicle speed is below 37 km/h (23 mph).
Coast Disengage: When the PCM/ECM detects that the cruise set/coast signal is active and the throttle blade fully closes the cruise control system will disengage until the PCM/ECM detects that the set/coast signal is inactive. The cruise control system will then engage and set with the new vehicle speed.
Decel Rate: The PCM/ECM detects that the vehicle deceleration is greater than the calibrated cruise control threshold.
DTC Set: The PCM/ECM detects that a DTC has been set which affects the cruise control operation.
Engine Run Time: The PCM/ECM detects that the cruise control system has been requested and the engine run time counter is not active.
Engine Speed: The PCM/ECM detects that the engine speed is less than or greater than a calibrated RPM.
ETC: The PCM/ECM detects a fault within the throttle actuator control (TAC) system.
First Gear: While the cruise control system is active, the PCM/ECM detects that the transmission is in Drive 1.
High Accel.: The PCM/ECM detects that the vehicle acceleration is greater than the calibrated cruise control threshold.
High Decel.: The PCM/ECM detects that the vehicle deceleration is greater than the calibrated cruise control threshold.
High Speed: The PCM/ECM detects that the vehicle speed is greater than the calibrated amount.
Illegal Mode: The PCM/ECM detects that the acceleration mode is active without the activation of the Accel. switch.
Injector Disable: The PCM/ECM detects that the engine is overspeed and that the fuel shutoff has been activated.
Low Speed: The PCM/ECM detects that the vehicle speed is less than 37 km/h (23 mph) while the cruise control system was enabled.
Low Voltage: The PCM/ECM detects that the ignition voltage is below 9 volts.
Manual/Neutral: The PCM/ECM detects that transmission is in Neutral, Reverse or Park.
Memory Corrupt: An internal PCM/ECM memory fault is detected.
MPH Limit: The PCM/ECM detects a that the vehicle is overspeed and that the fuel shutoff has been activated.
No History: This parameter is displayed when a new PCM/ECM has been installed.
None: This parameter is displayed when a new PCM/ECM has been installed.
Off: The PCM/ECM detects that the cruise On/Off switch was turned to Off when the cruise control system was enabled.
Over Set Speed: This parameter is displayed when the current vehicle speed is greater than the set vehicle speed by more than a calibrated amount.
Over Speed: This parameter is displayed when the current vehicle speed is greater than the set vehicle speed by more than a calibrated amount.
Over Speed Tap: This parameter is displayed when 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.
Pedal Initialize: The PCM/ECM detects that a stop lamp pedal activation had not occurred before the cruise control system was requested.
PCM Error: The PCM/ECM detects that a cruise control software execution error is present.
PCM Inhibit: The PCM/ECM detects a RAM corruption associated to the cruise control system.
Pedal > Cruise: The PCM/ECM detects that the accelerator pedal overrides the set vehicle speed for approximately 60 seconds.
Serial Data: A fault in the serial data circuit from the cruise control switch to the platform module is detected.
S/C On, CC Off: When the PCM/ECM detects that the cruise set/coast signal is active and the throttle blade fully closes the cruise control system will disengage until the PCM/ECM detects that the set/coast signal is inactive. The cruise control system will then engage and set with the new vehicle speed.
S/C On -- Speed High: This parameter is displayed when 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.
Stop Lamp Switch: The PCM/ECM detects that the stop lamps have been activated.
TAC Inhibit: The PCM/ECM detects a fault within the TAC system.
Traction: The PCM/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.
Traction Loss: The PCM/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.
Two Commands: The PCM/ECM detects that the Set/Coast switch and the Resume/Accel switch are active at the same time.
Two CC Commands: The PCM/ECM detects that the Set/Coast switch and the Resume/Accel switch are active at the same time.
Under Speed: The PCM/ECM detects that the vehicle speed is less than the cruise memory speed by more than a calibrated amount.
Under Set Speed: The PCM/ECM detects that the vehicle speed is less than the cruise memory speed by more than a calibrated amount.
