Checking resistance

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Remove rear right wheel housing liner: → 66 EXTERIOR EQUIPMENT

Fig 1: Locating Connector Of Leak Detection Pump (LDP) V144

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect 3-pin connector - arrow - for Leak Detection Pump (LDP) V144.

Fig 2: Locating 3-Pin Connector At Fuel System Leak Detection Pump V144

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect multimeter to measure resistance between contacts 1 and 3 of LDP V144 using adapter cables VAG 1594 A. Specification: 640...720 Ω
Connect multimeter to measure resistance between contacts 2 and 3 of LDP V144 using adapter cables VAG 1594 A. Specification: 12.5...19.5 Ω

If the specifications are not attained:

Replace Leak Detection Pump (LDP) V144 , - -.
Check DTC memory: → 01 ON BOARD DIAGNOSTIC (OBD)
Read readiness code: → 01 ON BOARD DIAGNOSTIC (OBD)
Generate readiness code again if DTC memory has been erased or engine control module separated from permanent positive supply. → 01 ON BOARD DIAGNOSTIC (OBD)