In 2004, the belt speed of Hainan Mazda 323 automatic transmission 1.8 was unstable during driving.

First, check the intake bellows to see if there is any crack, that is, the section from the air flow meter to the throttle. If only it cracked. As if nothing had happened, look at the two ignition coils to see if there is any leakage. The two ignition coils of 323, 1.8L are the most prone to failure. Look at the spark plug. If it's okay. Just use X43 1 to read the digital flow of throttle position sensor and idle motor. The voltage of the throttle position sensor is between 0.48 and 0.5 1. If it is not within the range, replace the throttle position sensor. If it is normal, see the steps of idle motor. The idling motor will jump between 60 and 65 steps without air conditioning, and between 90 and 95 steps with air conditioning. If it is out of range, it must be replaced.