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.
Powertrain Control Module (PCM) Description: Notes
The Powertrain Control Module (PCM) is designed to maintain exhaust emission levels while maintaining excellent driveability and fuel efficiency. The PCM controls the following operations:
- The fuel control
- The ignition control (IC)
- The knock sensor (KS) system
- The automatic transmission shift functions
- The manual transmission 1-4 Upshift and Reverse Inhibit
- The cruise control enable, if the vehicle has this equipment
- The generator
- The evaporative emission (EVAP) purge
- The A/C clutch control
- The cooling fan control
- The on-board diagnostics for the powertrain functions
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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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