Problem: The water spray function of the 2005 Touran sprinkler motor failed

    Fault phenomenon: A Touran car equipped with a 2.01. engine, starting the vehicle, after opening the car water spray motor system, the motor is not sprayed with water, and the air outlet of the instrument panel blows the natural wind.

    Fault diagnosis: Check the configuration status of the car water spray motor system, and know that the car is equipped with a variable displacement air conditioner compressor. The car water spray motor control unit can control the change of the air conditioner compressor according to each sensor signal and command signal. The working current of the solenoid valve adjusts the compression power of the water spray agent to control the water spray function of the air conditioner.

    After confirming the symptoms of the fault, after starting the engine, it is found that the outside temperature of the meter is -24C, which is a substitute value when the signal of the outside temperature sensor is poor, indicating that the control unit of the vehicle water jet motor may receive the temperature outside the vehicle. The signal is too low, thus interrupting the air conditioning function. The V.A. G1552 diagnostic instrument is used for self-diagnosis of the automotive water jet motor system, and there is a fault code for the poor temperature sensor outside the vehicle. The outside temperature sensor is removed for inspection and its resistance is measured to match the standard value. Install the outside temperature sensor and clear the fault code. The outside temperature of the meter is 32%. Start the vehicle, turn on the air conditioner, and the system still does not spray water. The operating voltage of the variable displacement solenoid valve is measured as ov. Use a air conditioning pressure gauge to measure the water spray pressure within the normal range. The test component function menu is selected to test the actuators of the automobile water spray motor system. As a result, the damper actuators can be operated, and the various positions of the blower are sequentially triggered to operate, and the liquid crystal display of the control panel of the automobile water spray motor is fully illuminated. The above test results show that the control unit of the water jet motor and its power supply circuit are normal.