Golf GTI L4-2.0L (ABA) (1997)
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Evaluating display group 115
Relevance of values in 8-digit number block
Checking Basic Voltage
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Separate 4-pin connector (black) -1- to HO2S -G39- (before three way catalytic converter).
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Connect multimeter with test leads from VW 1594 to measure voltage between terminals 3 and 4 (ECM side of harness connector).
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Start engine and measure the basic voltage.
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Specification: 0.40-0.50 volts
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Switch ignition off.
If the specification is not attained: