LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volkswagen >> 2015 >> Passat TDI SE, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> 3.6L - Generic Scan Tool - Engine Code: CDVB (Transmission DTC Tables & Diagnostic Procedures) >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Leak Detection Pump -V144-, CHECKING >> Function
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Leak Detection Pump -V144-, CHECKING: Function

The system can test the evaporative system integrity by applying a vacuum signal, ported or manifold, to the fuel tank in order to create a small vacuum. The Engine Control Module -J623- then monitors the ability of the system to maintain the vacuum through signals sent from the Leak Detection Pump -V144-. If the vacuum remains for a specified period of time, then there are no evaporative leaks, and a PASS is reported by the Engine Control Module -J623-. If there is a leak, the system either will not achieve a vacuum, or a vacuum cannot be maintained. Usually a fault can only be detected after a cold start.

Special tools and workshop equipment required 

scientia non olet · About LEMON Manuals