Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN1999CABRIO (1V7) L4-2.0L (ABA)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSLEAK DETECTION PUMP (LDP), CHECKING
1999 Volkswagen Cabrio (1V7) L4-2.0L (ABA)
Leak Detection Pump (LDP), Checking
1999 Volkswagen Cabrio (1V7) L4-2.0L (ABA)SECTION 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-.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.