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
The PCM has a single 104-pin connector. PCM receives input from sensors and other electronic components such as switches and relays. Based on information received and programmed into its Keep Alive Random Access Memory (RAM), PCM generates output signals to control various relays, solenoids and actuators.
PCM monitors several different engine control system circuits. If a malfunction occurs, PCM will record a Diagnostic Trouble Code (DTC) the next time engine is started and the same malfunction is detected. When a DTC is stored, PCM will also record and store engine operating conditions when malfunction occurred. This information is referred to as freeze frame data. See FREEZE FRAME DATA MODE under ADDITIONAL SYSTEM 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.