Diagnostic pump, checking electrically

• Remove right rear wheel housing liner, refer to REAR WHEEL-HOUSING LINER .

Fig 1: Locating 3-Pin Connector At Fuel System Leak Detection Pump V144

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Remove 3-pin connector from fuel system Leak Detection Pump (LDP) V144.
• Connect Multimeter V.A.G 1526C for resistance measurement between terminals 1 and 3 on Leak Detection Pump (LDP) V144. Specified value: 640 to 720 Ω.
• Connect Multimeter V.A.G 1526C for resistance measurement between terminals 2 and 3 on Leak Detection Pump (LDP) V144. Specified value: 12.5 to 19.5Ω.

If specifications are not obtained:

• Replace Leak Detection Pump (LDP) V144.
• Check DTC memory.
• Read readiness code.
• If DTC memory was cleared or engine control module disconnected from voltage supply, readiness code must be regenerated.