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.
Output Components
The PCM is responsible for the control and operation of many output components. The PCM controls many components with an electronic switch called an output driver that completes a ground circuit when turned ON. The PCM monitors the output components for the proper response to the PCM commands. Components where functional monitoring is not feasible will be monitored for circuit continuity and out-of-range values if applicable.
Output components to be monitored include, but are not limited to the following circuits:
- The throttle actuator control (TAC) motor
- The rocker arm oil control solenoid valve
- The exhaust gas recirculation (EGR) valve
- The fuel pump relay
- The evaporative emission (EVAP) system solenoids
- The malfunction indicator lamp (MIL) control
- The A/C compressor controls
- The electronic transaxle controls
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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.