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.
Control Units
All 4 and 5-cylinder models use separate Electronic Control Units (ECUs) for fuel injection and ignition control. Turbo models also use a turbo ECU. 6-cylinder models use a single ECU for ignition and fuel controls. Control unit(s) provide precise control of fuel, ignition and turbo operation. Each system has self-diagnostic capabilities and use same diagnostic unit for trouble code output. On 4-cylinder models, fuel injection control unit is located behind right front kick panel. Ignition control unit is located behind left side of instrument panel, near accelerator pedal. Turbo control unit is located behind left kick panel. On 5-cylinder models, both ECU's are located in right front of engine compartment. On 6-cylinder models, ECU is located above and to the right of accelerator pedal.
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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.