Air Conditioner Output Diagnostic Testing Audi A6 C5

Air Conditioner Output Diagnostic Testing Audi A6 C5

Depending on A/C Control Head -E87- version, all segments, control lights in buttons as well as the button illumination of – E87- are displayed or dark. For Audi allroad, the change-over of the A/C system is not performed with the model year change 2001 to 2002, instead it is a running change (implementation open, for vehicles with 4.2 Liter engine with start of production).

A/C clutch -N25- – A/C clutch -N25- clicks every 2 seconds, compressor is engaged. – Input of A/C Control Head -E87- is closed every 2 seconds (switched to Ground). – Check voltage supply for A/C clutch – N25- (via clutch relay -J44-) according to wiring diagram. – Check wiring between -E87-, -J44- and -N25- according to wiring diagram. – Replace A/C control head – E87-. The ECM uses the A/C compressor cut in signal to compensate for the temporarily higher load placed on the engine when the compressor is switched on. The ECM can switch off the A/C compressor via the A/C compressor cut-in output/input ( Read measuring value block). Fresh Air Blower -V2- – Fresh Air Blower -V2 is activated for 2 sec. with 0V, 3V, 6V, 9V, 12V, 15V, 0V etc. – Make sure fresh air blower moves freely. – Check Ground connection to Control module for fresh air blower -J126- according to wiring diagram. – Check control module for fresh air blower – J126- – Replace A/C control head – E87-.