May be everyone can using this method to fix it.
1.Unplug the high-voltage plug and low-voltage plug of the air conditioning compressor.
2. Check the insulation of the high-voltage system:
1) Adjust the insulation meter to the 500V/1000V range. It depends on the vehicle's high-voltage system. If the vehicle has a system below 500V, use the 500V range; if it is a 500-1000V system, use the 1000V range.
2) Connect the positive pole of the insulation meter to one end of the compressor's high-voltage connector, and the negative pole to the housing. As shown in the figure, the measured value should be >550MΩ. The specified insulation value varies with different vehicle models, generally 500Ω/V. For example, if the vehicle has a 400V system, the minimum should be 20MΩ, but the specific value should refer to the definition of the vehicle manufacturer. If the insulation value is lower than this value, it indicates a compressor failure, and it is recommended to replace the compressor.
1.Unplug the high-voltage plug and low-voltage plug of the air conditioning compressor.
2. Check the insulation of the high-voltage system:
1) Adjust the insulation meter to the 500V/1000V range. It depends on the vehicle's high-voltage system. If the vehicle has a system below 500V, use the 500V range; if it is a 500-1000V system, use the 1000V range.
2) Connect the positive pole of the insulation meter to one end of the compressor's high-voltage connector, and the negative pole to the housing. As shown in the figure, the measured value should be >550MΩ. The specified insulation value varies with different vehicle models, generally 500Ω/V. For example, if the vehicle has a 400V system, the minimum should be 20MΩ, but the specific value should refer to the definition of the vehicle manufacturer. If the insulation value is lower than this value, it indicates a compressor failure, and it is recommended to replace the compressor.
Note: The low-voltage system does not need to be tested for insulation. The instantaneous output voltage of the insulation meter is very high, which will damage the low-voltage system circuit.
3. Check whether the positive and negative poles of the high-voltage connector are short-circuited, as shown in the figure. A short circuit indicates damage to the compressor circuit, and it is recommended to replace the compressor; no short circuit indicates normal, and then proceed to the next step.
4. Check the IGBT and motor of the air conditioning compressor control board.
It is determined by measuring the voltage drop between the positive and negative poles of the high-voltage connector. Adjust the multimeter to the diode range. The positive pole of the multimeter touches the negative high-voltage terminal, and the negative pole touches the positive high-voltage terminal. If there is a normal voltage drop, it can be confirmed that the compressor IGBT and motor are basically normal, as shown in the left figure (the right figure is the air conditioning compressor control board).
5. The scroll disc of the air conditioning compressor is prone to damage, and the characteristic of damage is abnormal noise (the right figure is the damaged scroll disc).
3. Check whether the positive and negative poles of the high-voltage connector are short-circuited, as shown in the figure. A short circuit indicates damage to the compressor circuit, and it is recommended to replace the compressor; no short circuit indicates normal, and then proceed to the next step.
4. Check the IGBT and motor of the air conditioning compressor control board.
It is determined by measuring the voltage drop between the positive and negative poles of the high-voltage connector. Adjust the multimeter to the diode range. The positive pole of the multimeter touches the negative high-voltage terminal, and the negative pole touches the positive high-voltage terminal. If there is a normal voltage drop, it can be confirmed that the compressor IGBT and motor are basically normal, as shown in the left figure (the right figure is the air conditioning compressor control board).
5. The scroll disc of the air conditioning compressor is prone to damage, and the characteristic of damage is abnormal noise (the right figure is the damaged scroll disc).
The main reasons for the damage of the air conditioning compressor scroll include excessive moisture, excessive impurities, oil shortage or insufficient lubrication, motor damage, liquid hammer, high-temperature burnout, etc.
6. Compressor stator damage. The main reasons for stator damage include burned motor coils, poor condenser heat dissipation, exhaust valve leakage, stator winding insulation layer damage (short circuit) and open circuit.
The following figure shows the rotor (left figure) and rotor coil (right figure):
