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.
Individual Cylinder Fuel Trim (-2009)
General
The Engine control module (ECM) controls the fuel according to the description in Fuel trim above, but has another refined system for improving exhaust values, namely individual cylinder fuel trim.
In short, this means that the Engine control module (ECM) can detect the fuel/air mixture composition for each individual (6 cylinders).
To achieve this requires, among others, refined heated oxygen sensors that are very sensitive to the oxygen content in the exhausts.
Should problems occur, which would mean that the sensors, "lose" their extra sensitivity, the Engine control module (ECM) will return to traditional fuel trim.
This will not force the vehicle outside any limit values for exhausts, since this is more than enough to give "clean" exhausts.
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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.