Audi AMB Service Manual page 630

ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
Fig. 317: Identifying 2-Pin Electrical Connector & Terminals
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Connect voltage tester VAG1527B to contact 1 (positive) and 2 of connector.

Start Output Diagnostic Test Mode and actuate Wastegate bypass regulator valve N75.

Indicated on display:
Output Diagnostic Test Mode -->
Wastegate bypass regulator valve -N75-
LED must flash

If LED does not flash or if it is permanently lit:
Connect test box VAG1598/31 to engine control module wiring harness. Engine control module must not

be connected. --> 24 - MULTIPORT FUEL INJECTION (MFI)
Fig. 318: Identifying 2-Pin Electrical Connector & Terminals
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Check for open circuit and short to Ground/positive in following wiring connection:

2005 Audi A4 Quattro
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