Dirty throttle bodies can cause a variety of concerns and may result in MIL illumination (see Fig. 1). Although the ECU may compensate for changes in air flow with fuel trim adaptive logic adjustments, DTCs may illuminate over time. The ETC assembly should not be replaced for contamination. Any deposits need to be cleaned off following the instruction in this Tech Tip. 
Applicable Models: Kia Rondo, Forte, Optima, Sorento with Theta 2.0/2.4L engine.
Repair Procedure:
1. Remove the breather hose (A) and the air intake hose (B), to gain access to the ETC assembly (see Fig. 2). 
2. Disconnect the ETC connector (C) (see Fig. 3).
Caution: Keep hands away from the throttle body unless the connector is disconnected. 
3. Remove the four ETC mounting bolts as indicated and the ETC from the intake manifold (see
Fig. 4).
Caution: It’s not necessary to completely disconnect the coolant hose from the ETC for this particular repair. 
4. Spray throttle plate cleaner onto the throttle valve and bore areas and wipe off the carbon deposits with a rag or shop towel (see Figs. 5 and 6).
