Leak Detection Pump, Checking

Leak Detection Pump, Checking

Recommended Special Tools, Workshop Equipment, Testers, Measuring Instruments and Auxiliary Items
- V.A.G 1526 portable multimeter or V.A.G 1715 multimeter
- Adapter set V. A. G 1594
- Wiring diagram

Test Conditions
- The respective fuses of Leak Detection Pump (LDP) -V144- must be OK
- Ignition switched off.

Test Sequence
- Remove right front wheel.
- Remove right front wheelhousing liner.
- Disconnect Leak Detection Pump (LDP) -V144- connector - arrow -.







- Connect multimeter for resistance measurement as follows.

Leak Detection Pump (LDP) Specified value
-V144- Contact
1 + 3 640 to 720 Ohms
2 + 3 15 to 17 Ohms

If the specifications are not obtained:
- Replace Leak Detection Pump (LDP) -V144-,.
- Erase DTC memory of ECM. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Generate Readiness Code

If the specified values are obtained:







- Connect V.A.G 1598/31 test box to wiring harness connectors. Ground (GND) clip - arrow - at test box should be connected to B+. Do not connect ECM.







- Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:
Electrical Connector Contact V.A.G 1598/31 Test box socket
1 80
2 25

- Check wire between 3-pin connector terminal 3 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.

Wiring resistance: max. 1.5 Ohms

If no fault is detected in the wiring:
- Replace Motronic Engine Control Module (ECM) -J220-.