Envoy 4WD V8-5.3L VIN P (2004)
Cruise Control: Scan Tool Testing and Procedures
Scan Tool Data Definitions - Cruise Control
SCAN TOOL DATA DEFINITIONS
CRUISE CONTROL
The Scan Tool Data Definitions contains a brief description of all cruise control related parameters that are available on the scan tool.
Cruise Control Active: The scan tool displays Yes or No. The PCM determines the current status of cruise control operation. An active 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 (Disengaged History) for descriptions.
Cruise On/Off Switch: The scan tool displays On or Off. The PCM monitors the signal circuit of the On/Off switch of the cruise control system. A
closed switch is displayed as On.
Cruise Release Brake Pedal Switch: The scan tool displays Applied or Released. The PCM monitors the TCC brake switch/Cruise control release
signal circuit. An open switch is displayed as Applied.
Cruise Release Clutch/TCC Pedal Switches: The scan tool displays Applied or Released. The PCM monitors the TCC brake switch/Cruise control
release signal circuit. An open switch is displayed as Applied.
Cruise Resume/Axel. Switch: The scan tool displays On or Off. The PCM monitors the signal circuit of the Resume/Accel. switch of the cruise control
system. A closed switch is displayed as On.
Cruise Set/Coast Switch: The scan tool displays On or Off. The PCM monitors the signal circuit of the Set/Coast switch of the cruise control system. A
closed switch is displayed as On. The cruise 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 CKP signal circuit in order to determine the engine RPM.
Ignition 1 Signal: The scan tool displays 6 to 18 Volts. The PCM monitors the Ignition 1 signal circuit in order to determine the system voltage.
Stoplamp Pedal Switch: The scan tool displays Applied or Released. The PCM monitors the signal circuit of the stop lamp switch. An open switch is
displayed as Released.
TAC/PCM Communication Signal: The scan tool displays OK or Fault. The PCM uses the UART serial data circuit in order to communicate with the
TAC module. If the communication between the PCM and the TAC motor is interrupted, the scan tool displays Fault.
Vehicle Speed Sensor: The scan tool displays of to 255 km/h (158 mph). The PCM monitors the vehicle speed sensor signal circuit in order to
calculate the vehicle speed for display.
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.
Accel Rate: The PCM/ECM detects that the vehicle acceleration is greater than the calibrated cruise control threshold.
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.
