A4 Sedan L4-1.8L Turbo (AWM) (2001)
Output Diagnostic Test Mode
->
EVAP Purge Regulator Valve -N80
-
Press -> button until following display is shown:
Indicated on display:
Output Diagnostic Test Mode
->
Leak Detection Pump
The leak detection pump is activated for about 1 minute.
NOTE: You can hear the leak detection pump run at the left rear wheel housing when it is working. This will be difficult to hear. Make sure to be as
close to LDP as possible and to eliminate as much surrounding noise as possible.
If LDP -V144 is not activated (pump is silent):
-
Switch ignition off.
-
Remove LDP and disconnect electrical connector.
Checking resistance (all vehicles)
-
Switch multimeter Fluke 83 to resistance and connect as follows:
Vehicles manufactured > approx. 05.97
Leak detection pump
Specified value
terminal
1+3
640 to 720 Ohms
2+3
17.5 to 27.5 Ohms
Vehicles manufactured approx. 05.97 >
Leak detection pump
Specified value
terminal
1+3
640 to 720 Ohms
2+3
15 to 17 Ohms
If you measure values other than specified values:
-
Replace Leak Detection Pump (LDP) -V144.
If you reached specified values:
-
Check voltage supply to electrical connector of LDP.
Checking voltage supply (all vehicles)
NOTE: Voltage supply to the LDP is via the fuel pump relay.