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.
LH Control Unit
The LH control unit is located in module box in right rear corner of engine compartment. See Figure . LH control unit connector is color-coded Dark Green/Light Green. The LH control unit receives engine operating information from sensors and controls fuel injection.
The LH control unit has a self-adaptation feature for emission control system. As engine wears, deviations can occur such as wear in fuel injectors or intake air leaks. During the self-adaptation process, correction factors are continuously calculated and permanently stored.
After repairing fuel injection system, the LH control unit will again adapt during engine operation. Trail installation of LH control units from other vehicles is possible only if the LH control units self-adaptation feature is reset to its mean value. Refer to the TESTS W/CODES article in this section for self-adaptation reset procedure.
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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.
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