Performance problems of current series of throttle actuators of Honda Accord

The fault code P2 1 18 is described in detail as follows:

System fault range: fuel, air or emission control.

Throttle actuator control motor current range/performance is poor.

P2 1 18 fault code knowledge:

1. Position and function of idle air control valve on vehicle: a). It is installed on the throttle body; b)。 It controls the air circulation area of the bypass passage in the throttle body, thus controlling the air intake of the engine. According to the signals sent by various sensors, ECU can control the engine speed within the target speed range, and the target speed can be calibrated according to the coolant temperature.

2. The type, structural principle and influence of idle air control valve: The essence of stepping motor is a micro motor. Because the coils of the motor are electrified with currents in different directions, the motor will rotate in different directions, and the rotating shaft of the motor will drive the lead screw to move, thus indirectly controlling the opening of the valve. ECU sends out a digital square wave signal to control the forward and reverse rotation of the motor, and then controls the stroke of the stepping motor. It will cause failures such as unstable idle speed.

Fault meaning analysis: 1. The fault code explains that the function of the throttle position sensor is to convert the throttle opening into an electrical signal and send it to ECM as the basis for ECM to judge the working condition of the engine. The high voltage of the throttle position sensor means that the ECU will set this fault code when it receives a signal voltage higher than 4.8 V from the throttle position sensor.

Fault causes and solutions: 1. Cause of failure a). Whether the throttle valve is dirty; B) Whether the throttle position sensor and its circuit have short circuit, open circuit or poor contact; c)。 ECU failure.

2. Treatment method a). If this fault code appears, check whether the throttle valve is dirty; If there is dirt, please clean it up. If the fault is not solved or there are other faults, please find professional technicians. B) Failure to clean the throttle for a long time will lead to an error in the throttle opening, and at the same time, air with impurities will enter the engine combustion chamber, resulting in abnormal engine operation. There is no strict limit on the frequency of cleaning the throttle, which has a lot to do with car habits and environment. Under normal circumstances, it is recommended to clean it once every 20,000 kilometers.