100 Quattro Sedan L5-2309cc 2.3L SOHC (NF) (1989)
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connect black 10-point Board computer connector to adapter VW 1594/17
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connect voltmeter between contact 5 and engine ground
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start engine and run continuously between 1000 RPM and 4000 RPM
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voltage must vary between 0.3 and 0.8 Volts (depending on engine RPM)
If NOT OK,
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repair open circuit between fuel injection control module (Engine Control Module) and black 10-point Board computer connector or replace fuel
injection control module (Engine Control Module)