Scan Tool Data Definitions

SCAN TOOL DATA DEFINITIONS (CRUISE CONTROL)

The Scan Tool Data Definitions list contains a brief description of all of the cruise control related parameters that are available on the scan tool. On vehicles equipped with a 3.6L (LY7), an engine control module (ECM) is used. On vehicles equipped with a 3.8L (L26), a powertrain control module (PCM) is used.

Cruise Control Active: The scan tool displays Yes or No. The ECM/PCM determines the current status of the cruise control operation. An operating cruise control system is displayed as Yes.

Cruise Disengage (1-8) History: The scan tool displays the last 8 reasons why the cruise control system was disengaged. Refer to the Scan Tool Data Definitions (Disengage History) for descriptions.

Cruise Inhibit Reason: The scan tool displays the reason why the cruise control system is Inhibited. Refer to the Scan Tool Data Definitions (Disengage History) for descriptions.

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/PCM. An active switch is displayed as On.

Cruise Resume/Accel Switch: The scan tool displays On or Off. This is the state of the resume/accel switch as detected by the ECM/PCM. An active cruise resume and accel switch is displayed as On.

Cruise Set/Coast Switch: The scan tool displays On or Off. This is the state of the cruise set switch as detected by the ECM/PCM. An active cruise set switch is displayed as On. The cruise control On/Off switch must be On to view the parameter correctly.

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

Ignition 1 Signal: The scan tool displays 0 to 25.5 volts. The PCM monitors the voltage of the ignition 1 voltage circuit.

Initial Brake Apply Signal: The scan tool displays Applied/Released. The body control module (BCM) monitors the signal circuit of the brake pedal position sensor. When the PCM receives a serial data message from the BCM indicating that the brake pedal has been applied, the scan tool displays Applied.

Reduced Engine Power: The scan tool displays Active or Inactive. When the ECM/PCM detects that a malfunction in the throttle actuator control (TAC) System exists, the scan tool displays Active.

Stop Lamp Pedal Switch: The scan tool displays Applied or Released. The ECM/PCM monitors the stop lamp pedal switch signal circuit. An activated brake pedal is displayed as Applied.

Stop Lamp Pedal Switch Signal: The scan tool displays Volts. The PCM monitors the voltage of the stop lamp pedal switch signal circuit.

TAC/PCM Communication Signal: The scan tool displays OK or Fault. The PCM uses the universal asynchronous receiver transmitter (UART) serial data circuit in order to communicate with the throttle actuator control (TAC) module. A malfunction in the UART serial data circuit is displayed as Fault.

TAC Stop Lamp Pedal Switch: The scan tool displays Applied or Released. The TAC module monitors the stop lamp pedal switch signal circuit. An activated brake pedal is displayed as Applied.

TAC Vehicle Speed Signal: The scan tool displays Ok or Fault. The PCM determines the status of the vehicle speed signal circuit to the TAC module. A malfunction in the vehicle speed signal circuit is displayed as Fault.

TCC Brake Pedal Switch: The scan tool displays Applied or Released. The ECM monitors the status of the brake pedal. An activated brake pedal is displayed as Applied.

Traction Control Status: The scan tool displays Active or Inactive. When the ECM/PCM detects that a traction control condition exists, the scan tool displays Active.

Vehicle Speed Circuit History: The scan tool displays OK/Open/Short/Invalid State. The PCM detects and determines the history of the vehicle speed circuit.

Vehicle Speed Circuit Status: The scan tool displays OK/Fault/Invalid State. When the PCM detects that a malfunction in the vehicle speed signal circuit exists, the scan tool will display Open or Short.

Vehicle Speed Sensor: The scan tool displays 0-255 km/h (0-155 mph). The ECM/PCM monitors the vehicle speed sensor signal in order to calculate the vehicle speed for display.