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.
Engine Control Module (ECM) / Powertrain Control Module (PCM)
- Brake Switch
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The scan tool displays Applied/Released. The scan tool displays the status of the brake switch.
- Ignition 1
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The scan tool displays 0-20 V. The scan tool displays the voltage as received on the Ignition 1 circuit to the ECM/PCM.
- Transmission Range
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The scan tool displays Reverse, 2nd, Drive, Park, Neutral, 1st and 3rd. The scan tool display the switch status of the transmission (L61).
- TR Sw.
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The scan tool displays Invalid, Park, Reverse, Neutral, Drive, Intermediate and Low. The scan tool display the switch status of the transmission (L66).
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.