Passat Wagon L4-1781cc 1.8L Turbo (AEB) (1998)
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Connect test box VAG 1598/31 to control module wiring harness (The engine control module remains disconnected).
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Bridge test box sockets 1+48 using cable from VAG 1594.
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Switch ignition on.
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The EPC warning light must light up.
If the EPC warning light does not light up:
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Switch ignition off.
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Remove instrument cluster and check bulb and its voltage supply.
If no malfunction is found:
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Check wiring for open circuit between test box socket 48 and instrument cluster according to wiring diagram.
If no wiring malfunction is detected:
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Replace Engine Control Module (ECM).
EPC warning light is lit continuously
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Connect test box VAG 1598/31 to control module wiring harness (The engine control module remains disconnected).
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Check wiring for short circuit to Ground between test box socket 48 and instrument cluster according to wiring diagram.
If no wiring malfunction is detected:
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Replace Engine Control Module (ECM).