KIA notes that hard/impossible engine starts may occur due to dirty throttle bodies on the Theta 2.0/2.4L engines, storing throttle-valve-stuck-closed DTCs P2110, P2118 or P2119.
Although the ECU may compensate for changes in air flow with fuel trim adaptive logic adjustments, DTCs may illuminate over time. Symptoms can occur from carbon deposits and/or fuel additives accumulated over time in the throttle body. Any deposits need to be cleaned off following the instructions in this TSB.
1. Remove the breather hose (A) and the air intake hose (B) to gain access to the ETC (electronic throttle control) assembly.
2. Disconnect the ETC connector (C). CAUTION: Keep fingers and hands away from the throttle body unless the connector is disconnected.
3. Remove the four ETC mounting bolts as indicated and remove the ETC from the intake manifold. It is not necessary to disconnect the coolant hose from the ETC completely for this repair.
4. Spray throttle plate cleaner (KIA recommends their P/N 35100 2G200) onto the throttle valve and bore areas and wipe off the carbon deposits with a rag or shop towel. Use caution while trying to open the throttle plate and avoid making any scratches to the throttle valve and bore areas during cleaning.
5. After ETC cleaning, reinstall all removed parts in reverse order. Note: If the ETC gasket has been damaged or contaminated by foreign substances, replace the gasket.
The tightening torque values for the ETC mounting bolts is as follows:
Theta I 2.4L: 5.8 to 7.2 ft-lbs (7.8 to 9.8 Nm)
Theta II 2.0/2.4L: 7.2 to 8.7 ft-lbs (9.8 to 11.8 Nm)
6. Erase all DTCs using the GDS.
7. Reset the learned ETC Throttle Valve Position with the use of GDS by going to “System Option.”
8. Turn the ignition switch to the ON position for 2 seconds and OFF for 5 seconds (do not start the engine) to allow the ECM to automatically perform the throttle valve position learning operation.
NOTE: In order for proper throttle position relearning to take place, the battery should feature greater than 10 V, and engine coolant temperature should be greater than 41.5 degrees F.