Golf L4-1.8L Turbo (AWW) (2003)
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Connect multimeter to measure voltage between contact 1 and earth.
Specification: at least 11.5 V
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Switch ignition on.
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Connect multimeter to measure voltage between contact 2 and earth.
Specification: at least 11.5 V
If the specifications are not obtained:
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Check wire between 4-pin connector contact 1 and main fuse/contact 2 and central electrics using wiring diagram.
If the specification is obtained:
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Connect test box V.A.G 1598/31 to control module wiring harness. Engine control module remains disconnected.