Golf GTI V6-2792cc 2.8L DOHC (AAA) SFI (1998)
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Connect VAG 1598/18 test box to ECM wiring harness (arrow).
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Switch ignition on.
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Connect multimeter using test leads from VW 1594 to measure voltage at test box sockets 1 and 23.
Specification: 12-14.5 volts.
If the specification is not attained:
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Check wiring according to wiring diagram.