Repair the idle motor by yourself. How to measure four wires of idle motor?

Idle motor is used to control the idle speed of the car. If there is a fault or damage, it will affect the idle running of the automobile engine. Cars may have difficulties in starting, unstable idle speed, idling jitter, idling flameout and slow acceleration, and need to be repaired or replaced in time. Some hands-on friends want to repair idle motors themselves, so how to repair them? Most of the faults of idle motor are caused by carbon and dust accumulation. Because the idle motor controls the idle air flow and is connected with the throttle valve, it is easy to produce carbon deposit and a large amount of ash deposit after a period of use, which affects the accurate control of the idle motor. At this time, it needs to be cleaned. Remove the idle motor and spray carburetor cleaner. It should be noted that the idle motor is a precision part. When cleaning, the motor cone head must be put down, and then the carbon deposit on the cone head and sleeve should be sprayed with cleaning agent, and then cleaned with a towel to prevent the cleaning agent from flowing into the motor and causing damage. Idling motor is also called stepping motor. There are 3 lines, 4 lines and 6 lines commonly, and 4 lines are the majority. There are two groups of coils, and four wires are respectively connected to ECU and power supply, so they cannot be grounded, otherwise the ECU will be burned out. For the four-wire measurement method of idle motor, the resistance of four pins can be measured by the resistance file of multimeter. The resistance of the coil is generally tens of ohms, and the measured resistance of the two groups of coils should be similar, indicating that there is no problem with the idle motor.