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.
Computer Controlled Shutdown
The PCM energizes the PCM power relay, by grounding the PCMRC circuit. After the ignition is in the OFF, ACC or LOCK position, the PCM stays powered up until the engine shutdown occurs and other conditions have been met.
The PCM initiates logic which will lead to powering down the PCM power relay. After this logic is initiated, the following conditions must be met for the PCM power relay to be depowered:
- The ignition is OFF.
- The gear selector position is in PARK.
- The EVAP leak check monitor is complete.
- The vehicle speed is below a calibrated threshold.
- The PCM power relay diagnostic is complete.
- The electric water pump is OFF.
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.