Leak Detection Pump (LDP), Checking
Leak Detection Pump (LDP), checking
Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram
Requirements
- The respective fuses of Leak Detection Pump (LDP) -V144- must be OK.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.
Test sequence
- Disconnect 3-pin connector of Leak Detection Pump (LDP) -V144- (arrow).
- Measure resistance between terminals 1 + 3 of diagnostic pump.
Specified value: 640 to 720 Ohms
- Measure resistance between terminals 2 + 3 of diagnostic pump.
Specified value: 12.5 to 19.5 Ohms
If specified values are not obtained:
- Replace Leak Detection Pump (LDP) -V144-.
- Erase DTC memory of Engine Control Module (ECM).
- Generate readiness code.
If specified values are obtained:
- Check wires according to wiring diagram.
Checking wiring
- Connect test box to control module wiring harness.
Vehicles > 08.99
- Check wires between test box and 3-pin connector for open circuits according to wiring diagram.
Terminal 1 + socket 46
Terminal 2 + socket 35
Wire resistance: max. 1.5 Ohms
- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: Infinite Ohms
- Check wire between 3-pin connector terminal 3 for open circuit according to wiring diagram.
Wire resistance: max. 1.5 Ohms
- Erase DTC memory of Engine Control Module (ECM).
- Generate readiness code.
If no malfunctions are found in wires:
- Replace Motronic Engine Control Module (ECM) -J220-.
Vehicles 09.99 >
- Check wires between test box and 3-pin connector for open circuits according to wiring diagram.
Terminal 1 + socket 37
Terminal 2 + socket 16
Wire resistance: max. 1.5 Ohms
- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: Infinite Ohms
- Check wire between 3-pin connector terminal 3 for open circuit according to wiring diagram.
Wire resistance: max. 1.5 Ohms
- Erase DTC memory of Engine Control Module (ECM).
- Generate readiness code.
If no malfunctions are found in wires:
- Replace Motronic Engine Control Module (ECM) -J220-.