How to restore idle speed after Mitsubishi Wingshen cleaned the throttle?

After the car is fully warmed up, turn off the engine, remove the key, open the engine cover, disconnect the negative electrode of the battery for 5 minutes (without tools, I made it with pliers), then connect the negative electrode back, plug in the key and turn to the second position of the switch, but it won't start.

After the engine self-check, the fault light goes out, the key is turned to the off position, wait for 30 seconds, and then turn the key to the second position of the switch, so it cannot be started. After the engine self-check, the fault light goes off, then the ignition is started, and the idling speed is 10 minute (during which all equipment is turned off), and then the idling speed is about 750 rpm, and everything is normal.