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.
Electronic Control Unit (Ecu)
The ECU is located under the instrument panel, above the accelerator pedal. It receives information from the 13 engine sensors or switches to determine engine operating conditions at any particular moment. The ECU responds to these signals by sending a control signal to the fuel injector, fuel pump, ignition control module, idle speed actuator (ISA) motor, EGR solenoid, and canister purge solenoid. It also controls the Load Swap relay, and on Man. Trans. models, the up-shift indicator lamp.
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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.