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)
- BPP Circuit Signal
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Display Applied or Released status of the brake pedal position signal.
- Ignition 1 Signal
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Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch.
- Stoplamp Pedal Switch
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Display Applied or Released status of the stoplamp pedal switch.
- TCC Brake Switch
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Displays ON or OFF status of the TCC Brake switch.
- TR Sw.
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Displays Park, Reverse, Neutral, Drive 5, Drive 4, Drive 3, Drive 2 or Drive 1.
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.