A4 Quattro Wagon V6-3.2L (BKH) (2005)
Checking internal resistance
-
Connect hand multimeter V.A.G 1526 A or V.A.G 1526 B for resistance measurement as follows.
Leak detection pump (LDP) Terminal
Specified value
- 1 - + - 3 -
640 to 720 Ohms
- 2 - + - 3 -
15 to 17 Ohms
If specifications are not obtained:
-
Replace Leak Detection Pump (LDP) V144.
If specified values are achieved:
-
Check voltage supply of leak detection pump .
Checking voltage supply
NOTE: Voltage for leak detection pump is supplied via Motronic Engine Control Module (ECM) Power Supply Relay J271 .
Test conditions
-
Fuse for leak detection pump OK
-
Connect voltage tester V.A.G 1527 B as follows:
Harness connector Terminal
Measure to
- 3 -
Engine Ground (GND)
-
Briefly operate starter.
-
LED must light up.
If LED does not light up:
-
Check electrical harness connection from terminal - 3 - via fuse to Motronic Engine Control Module (ECM) Power Supply Relay J271 for open
circuit according to wiring diagram.