Sail air conditioning compressor not work

A mileage of about 160000km 2003 Sail sedan. 車用故障診断ツール Owners reflects the feeling: car air conditioning cooling effect, further inspection found that the air-conditioning compressor does not pull, the air conditioning system is not working.


Sail air conditioning system Auto Key Programmer uses a the V5 variable displacement compressor. Work under refrigeration conditions without circulation compressor engagement and disengagement, it will be changed in accordance with the cooling load displacement. V5 compressor through the loop clutch, but by changing the stroke to meet the requirements of the air conditioner. A control valve located in the back cover of the compressor, the control valve for the the induction compressors low side pressure, and start of the stroke of the mechanical device of the compressor, and thus the open air when the compressor is always remain in operation. Air conditioning compressor clutch pull need to meet the following conditions: intake air temperature the degree (IAT)> 5 ° C, the engine water temperature (ECT)> 5 ° C and <120 ° C, the temperature outside the car (OUT-T)> 0 ℃, air conditioning pressure (ACP ) 250 - 2000kPa, auto diagnostic tool the throttle (TP) is not a rapid acceleration state, and the throttle opening degree of <90%.



First basic checks on the air conditioning system, after the test, the air conditioning system in the normal amount of refrigerant, thermostat switch properly.

 

Detection system according to the circuit diagram of the air conditioning system, the air conditioning is turned on, measure the air-conditioning compressor electromagnetic coil operating voltage detection F15 fuse normal. Air conditioning compressor relay K60. car diagnostic tools wholesale Turn the ignition switch, air conditioning unloading relay K6 can pull, and then measure the K6 8 pin 12V voltage, open the ignition switch and air conditioning after measuring ECM 75 pin (air conditioning request signal) voltage but is 0V. Check the thermostat S130 and its relay K27, and K27 No. 8-pin 12V voltage. Check composite pressure switch S20. Open the front bumper in the network after the discovery the composite pressure switch (air conditioning request signal) line of skin damage, and the lap with the front bumper iron re-bandaged broken harness, the normal commissioning, troubleshooting.



Air conditioning request signal line damaged front bumper lap together cause the ECM receives less than effective air conditioning request signal (high voltage), so the ECM not always control the air conditioning compressor relay K60 action, resulting in the compressor can not pull fault.