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 BCM.
- Generator F-Terminal (PCM)
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The scan tool displays the percentage of the field current.
- Generator L-Terminal (ECM)
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The scan tool displays Enabled/Disabled. The scan tool displays Disabled until the engine is running, then the ECM supplies then the percentage value varies depending on electrical loads.
- Generator L-Terminal (PCM)
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The scan tool displays Active/Inactive. The scan tool displays Inactive until the engine is running, then the PCM supplies then the percentage value varies depending on electrical loads.
- Ignition 1 (ECM/PCM)
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The scan tool displays 0-20 Volts. The scan tool displays the voltage as received on the Ignition 1 circuit to the ECM/PCM.
- Transmission Range (ECM)
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The scan tool displays Reverse, 2nd, Drive, Park, Neutral, 1st and 3rd. The scan tool displays the switch status of the transmission (L61).
- TR Sw. (PCM)
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The scan tool displays Invalid, Park, Reverse, Neutral, Drive, Intermediate and Low The scan tool displays the switch status or the transmission (L66).
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.