How to rule out the acceleration failure of Dongfeng Nissan Teana?

1) Check the trouble-free code with the computer first to see if the throttle valve is dirty. First of all, it is suspected that there is something wrong with the gasoline added on the first day, and the throttle is dirty, which may be the cause of the failure. Then replace all the gasoline in the tank, and then clean the fuel injector and throttle. You can learn successfully at idle speed, but the fault still exists.

2) Trouble-free gasoline troubleshooting, no fault code. Monitor the engine data again. When idling, all the data are normal except that the voltage of the air flow sensor is a little low. According to Teana Maintenance Manual, the idle speed of warm-up is 0.9V ~ 1.2V, and the speed should be 2.4V when it reaches 4000 rpm. According to computer data monitoring, it is only 2. 1V at 4000 rpm and 2.4V at 4800 rpm. The air flow meter signal is suspicious, and the air intake signal is faulty. Troubleshooting after replacing air flow meter.