Self-Study Programme 208 Air Conditioner in the Motor ... - Volkspage

Fault diagnosis through self-diagnosisNot all air conditioners have self-diagnosticcapability.Self-diagnosis is used very little in the case ofmanual air conditioners (they have either no orvery few sensors/actuators/control units).In some manual air conditioners, however, thecircuit for the compressor and the sensors of thesafety cut-out are registered by the selfdiagnosis.Automatic air conditioners with control unitsusually have self-diagnostic capability.The address word for the self-diagnosis:08 - Air conditioner/heating electronics202_002Self-diagnosis can be performed withVehicle Diagnostic, Testing and InformationSystem VAS 5051,with Vehicle Systems Tester V.A.G 1552 or withFault Reader V.A.G 1551.Faults which impair the operation of anautomaticair conditioner are stored in the fault memory ofthe air conditioner control unit.In some systems, e.g. CLIMATRONIC, faults ofthis type are indicated on the display unit whenthe ignition is switched on (all the symbols flashfor several seconds).208_122The self-diagnosis functions and theself-diagnosis procedure are explainedin detail in the Workshop Manualfor the heating and air conditioningsystem of the vehicle type.Self-diagnosis can be performed by anyworkshop, because the refrigerantcircuit is not affected by this procedure(i.e. it is not opened).71