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): Notes
The ECU calculates ignition timing and operates the ignition power module. Ignition timing is modified by the ECU to meet engine operating conditions. The manifold pressure, engine speed, manifold air temperature, engine coolant temperature and spark knock is used by the ECU when calculating the correct ignition timing. The ECU automatically adjusts for altitude changes. The ECU is located under the instrument panel on the passenger side of the vehicle. See Fig 1 .
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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.