Checking internal resistance

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect hand multimeter V.A.G 1526 A or V.A.G 1526 B for resistance measurement as follows.

Leak detection pump (LDP) Terminal	Specified value
- 1 - + - 3 -	640 to 720 Ω
- 2 - + - 3 -	15 to 17 Ω

If specifications are not obtained:

Replace Leak Detection Pump (LDP) V144 → Leak Detection Pump (LDP) V144 , removing and installing .

If specified values are achieved:

Check voltage supply of leak detection pump Checking voltage supply .