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
- Battery 1
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The scan tool displays 0-20 volts. The scan tool displays the voltage as received on the battery positive voltage circuit of the body control module (BCM).
- Generator L-Terminal
-
The scan tool displays High/Low. The scan tool displays High any time the key is in the ON position.
- Ignition 1 Signal
-
The scan tool displays 0-20 volts. The scan tool displays the voltage as received on the ignition 1 circuit to the engine control module (ECM).
NO RELATED
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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.