Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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. Vehicles equipped with a 4.2L (LL8) engine use a powertrain control module (PCM). Vehicles equipped with a 5.3L (LH6) engine use an engine control module (ECM).
- Cruise Control Active
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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 Control Active
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The scan tool displays Active or Inactive. The ECM determines the current status of the Cruise Control System. An active Cruise Control System is displayed as Active.
- Cruise Disengage (1 - 8) History
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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
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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 On/Off Switch
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The scan tool displays Active or Inactive. The ECM monitors the signal circuit of the Cruise Control System On/Off switch. A closed switch is displayed as Active.
- Cruise Release Clutch/TCC Pedal Switches
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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/Accel. Switch
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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 Resume/Accel. Switch
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The scan tool displays Active or Inactive. The ECM monitors the signal circuit of the Resume/Accel. switch of the Cruise Control System. A closed switch is displayed as Active.
- Cruise Set/Coast Switch
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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.
- Cruise Set/Coast Switch
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The scan tool displays Active or Inactive. The ECM monitors the signal circuit of the Set/Coast switch of the Cruise Control System. A closed switch is displayed as Active. The cruise On/Off switch must be switched On in order to correctly view the Cruise Set/Coast Switch parameter.
- Engine Speed
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The scan tool displays 0 to 9,999 RPM. The ECM/PCM monitors the CKP signal circuit in order to determine the engine RPM.
- Ignition 1 Signal
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The scan tool displays 6-18 Volts. The ECM/PCM monitors the Ignition 1 signal circuit in order to determine the system voltage.
- Reduced Engine Power
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The scan tool displays Active or Inactive. Active is displayed when the ECM/PCM detect a fault in the TAC System.
- TCC/Cruise Brake Pedal Switch
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The scan tool displays Applied or Released. The ECM monitors the TCC brake switch/cruise control release signal circuit. An open switch is displayed as Applied.
- Traction Control Signal
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This parameter displays the current status of the Traction Control System (TCS). The scan tool will display Active if the TCS operating. The scan tool will display Inactive if the TCS is not requested because of a wheel slippage condition.
- Traction Control Status
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This parameter displays the current status of the Traction Control System (TCS). The scan tool will display Active if the TCS operating. The scan tool will display Inactive if the TCS is not requested because of a wheel slippage condition.
- Vehicle Speed Sensor
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The scan tool displays 0 to 255 km/h (158 mph). The ECM/PCM monitors the vehicle speed sensor (VSS) signal circuit in order to calculate the vehicle speed for display.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.