(LDP) V144 , Checking

Leak Detection Pump (LDP) V144, Checking

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- The Fuse S282 fuse OK.
- The ignition switched off.

NOTE: The voltage for the Leak Detection Pump (LDP) -V144- is supplied by the Engine Component Power Supply Relay J757.

Procedure
- Remove left rear wheel housing liner.
- Remove the Leak Detection Pump (LDP) -V144- nuts - arrows -.
- Remove the Leak Detection Pump (LDP) -V144- with bracket attached.
- Press the release button and disconnect the hose coupling - 4 -.
- Cut the cable ties - 1 - and disconnect the hose - 2 -.







- Disconnect the Leak Detection Pump (LDP) V144 electrical harness connector - 3 -.

Checking internal resistance







- Using a Multimeter, check the Leak Detection Pump (LDP) V144 for resistance as follows:

Leak Detection Pump (LDP) Specified
V144 electrical harness valve
connector terminals
- 1 - + - 3 - 640 to 720 Ohms
- 2 - + - 3 - 15 to 17 Ohms

If any of the specifications were not obtained:
- Replace the Leak Detection Pump (LDP) -V144-.

If the specified values were obtained:

Checking voltage supply







- Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 to Ground (GND) for voltage.

Leak Detection Pump (LDP) Measure
-V144- electrical harness to
connector terminals
- 3 - Engine Ground (GND)

- Operate the starter briefly.
Specified value: battery voltage.
- Switch the ignition off.

If the specified value was not obtained:
- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
- Check the wiring for a short circuit to Ground (GND) or an open circuit.
- If necessary, repair the faulty wiring connection.

It the specification was obtained.

Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J623.







- Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connectors T94 and T60 terminals for an open circuit.

Leak Detection Pump (LDP) - Motronic Engine Control
V144- electrical connector Module (ECM) J623
terminals electrical connector T94 terminal or test box socket
- 1 - 40

Leak Detection Pump (LDP) - Motronic Engine Control
V144- electrical connector Module (ECM) J623
terminals electrical connector T60 terminal or test box socket
- 2 - 55

Specified value: 1.5 Ohms.

If the specification is not obtained:
- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
- If necessary, repair the wiring connection.

If no malfunction is found in wiring:
- Replace the Motronic Engine Control Module (ECM) J623.

Assembly is performed in the reverse order of the removal, note the following:
- Install the left rear wheel housing liner.

Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code.

- End of diagnosis.