Inspection and analysis: Connect VAS 5052 test, the vehicle traveling about 10min air conditioning vent natural wind began to blow. Read conditioning system data block group 1, shown as onboard power supply control unit (J519) issued a shutdown signal conditioned by CAN. Gateway into the list, are not the fault code stored in each control unit.
What is the reason for the air conditioning ktag turned off Nick defender J519 engine flameout after re-launch, the starter engine start feeling the moment seems to have a brief pause, the engine can smoothly start the machine, though, it feels as if the battery power is low. Suddenly thought would not be onboard power supply control unit (J519) detects the battery voltage is too low and closed the air conditioning system? Then open the engine compartment lid to check the battery and found that the car had to replace the battery, the negative terminal oxidation serious, measuring battery voltage of 12.2 V, the air conditioning is turned on to start the engine, and then measuring the battery voltage is only 12 V or so. Measuring the generator output voltage is normal. It seems that the problem is out on the negative battery terminal.
J519 original car's power management function, when the engine is running, J519 detects the battery voltage kess v2 drops below 12.2 V will close the air, due to the negative terminal of the car battery severe oxidation, leading to poor charging system charging, when air conditioning is turned on and after the headlamp high-power electrical equipment, battery voltage is low, thus automatically cut off the air conditioning system to work.
Troubleshooting: Clean the battery negative terminal.
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