Lotus has ruled out using its double-DRS system during the remainder of the Japanese Grand Prix weekend after testing it in practice.
The team tried the device for the first time at the German Grand Prix but has been unable to race it yet as it has not managed to get it to work at its full potential.
Raikkonen ran the double-DRS in opening practice at Suzuka, but the team has ruled out using it on Saturday or Sunday as it was unable to make it switch effectively.
"It worked a little bit but we are not going to run it," said Raikkonen.
"Plus we had some other issues during the running so it didn't help again to get the best idea. But it is not going to suddenly make us win if it worked 100 per cent."
Raikkonen admitted the device was also making the car harder to set up.
"It seems to be," he added. "I think you have to ask the team, but it started well the first time we tried it, and with all the things that were going on it hasn't been as easy as we had hoped, but we are learning with it."
The Finn was 14th quickest in the afternoon session, while team-mate Romain Grosjean finished in sixth place.