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/Powertrain Control Module
Vehicles equipped with manual transmission use an Engine Control Module (ECM). Vehicles equipped with automatic transmission use either ECM with separate Transmission Control Module (TCM), or a Powertrain Control Module (PCM), depending on model. PCM combines functions of ECM and TCM. PCM receives and processes signals from input devices. Operating conditions such as cold starting, altitude changes, acceleration and deceleration affect input device signals. Based on signals received, PCM sends signals to various components which control fuel injection, ignition timing, idle speed and emission control systems. For PCM location, see Fig 1-Fig 14 .
Use the Manual With the Right Hardware
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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.
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