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
The Scan Tool Data Definitions contains a brief description of all cruise control related parameters that are available on the scan tool. An engine control module (ECM) is used on a vehicle that is equipped with a 2.2 L (L61) engine and a powertrain control module (PCM) is used on a vehicle that is equipped with a 3.5 L (L66) engine.
- Brake Switch
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The scan tool displays Applied or Released. The ECM/PCM monitors the signal circuit of the stop lamp switch. An open switch is displayed as Released.
- Cruise Engaged
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The scan tool displays Yes or No. The ECM/PCM determines the current status of cruise control operation. An active cruise control system is displayed as Yes.
- Cruise Switch
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The scan tool displays On or Off. The ECM/PCM monitors the signal circuit of the On/Off switch of the cruise control system. A closed switch is displayed as On.
- Cruise Brake Switch
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The scan tool displays Applied or Released. The ECM/PCM monitors the signal circuit of the cruise/brake switch. An open switch is displayed as Applied.
- Cruise Resume/Accel
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The scan tool displays On or Off. The ECM/PCM monitors the signal circuit of the Resume/Accel. 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 Resume/Accel parameter.
- Cruise Set/Coast
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The scan tool displays On or Off. The ECM/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 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
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The scan tool displays 6 to 18 Volts. The ECM/PCM monitors the Ignition 1 signal circuit in order to determine the system voltage.
- Vehicle Speed
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The scan tool displays 0 to 255 km/h (158 mph). The ECM/PCM monitors the vehicle speed sensor signal circuit in order to calculate the vehicle speed.
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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.