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 a precision unit consisting of a one chip microprocessor, an analog/digital (A/D) converter, and an input/output (I/O) unit. The PCM is an essential part of the electronic control system. The PCM is responsible for such major functions as control of the fuel injectors, the idle air control (IAC) valve, the fuel pump relay, etc. The PCM performs the OBD 2 diagnostic tests of the emission related systems. The PCM supplies a buffered voltage to the various information sensors and switches. The PCM controls most components with an electronic switch that completes a ground circuit when turned on. The PCM is also responsible for a self-diagnosis function and a fail-safe function.
The PCM (1) is located below the glove box, underneath the instrument panel, on the right side of the passenger compartment.
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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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