K5 car during normal driving air conditioning suddenly no cooling, out of the natural wind. Analysis of the reasons: 1, the fuse blown 2, the pressure is too high or too low 3, the water cardiag temperature is too high 4, air conditioning control module 5, the engine ECU 6, the evaporator temperature sensor 7, wiring harness and other.

Then check:

1, first check the fuse is not blown, air conditioning controller wind speed, mixer temperature adjustment, AC switch and other modes are Normal, connected to the pressure gauge low pressure display 3bar, high pressure display 6bar, measuring the compressor ECV solenoid valve voltage is 0V,Indicating that the compressor is not working at this time;

2, connect the GDS, enter the engine system without fault code, observe the data flow: (1) air conditioning switch request to the ECU OFF (2) AC ON condition OFF (3) Air conditioning compressor OFF (4) Water temperature 85 ° C (5) Throttle opening 3% (6) Air conditioning line pressure 5.5bar from a few signals which reflect the air conditioning module AC mb star switch signal in the closed state, no Output control of the compressor signal, measuring the compressor ECV 1 and 2 pins to the air conditioning module of the 35-pin and 36-pin conduction, harness No break;

3, measuring waveform; measuring condor xc mini air conditioning module high CAN32 and low CAN33, engine ECU high CAN85 and low CAN63, waveform Normal, the wiring harness and other modules out of the fault.

4, the fault point locked in the air conditioning control module.

Posted by: obdtool at 07:06 AM | Comments (5) | Add Comment
Post contains 269 words, total size 2 kb.