Leak Detection Pump, Checking
Leak Detection Pump, 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.
Test procedure
- Perform a preliminary check to verify the customers complaint. General Diagnosis
Start diagnosis
- 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 value
V144 electrical harness
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 to
-V144- electrical harness
connector terminal
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 Module (ECM)
-V144- electrical connector J623 electrical connector T94 terminal or
terminals test box socket
1 40
Leak Detection Pump (LDP) Motronic Engine Control Module (ECM)
-V144- electrical connector J623 electrical connector T94 terminal or
terminals 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. Monitors, Trips, Drive Cycles and Readiness Codes
- End of diagnosis.