S4 V8-4.2L (BHF) (2004)
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Connect test box V.A.G 1598/31 to wiring harness connectors, with Engine Control Module (ECM) not connected. Connect Ground (GND) clip at
test box to Ground (GND) (not visible in illustration). See: Computers and Control Systems/Testing and Inspection/Reading and Clearing
Diagnostic Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring and Component Test
CAUTION: To avoid damaging electronic components, switch to the corresponding measuring range and observe all test conditions before
connecting the test leads.
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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:
Harness connector Terminal
Test box V.A.G 1598/31Socket
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25
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Repair wiring open circuit or short circuit according to wiring diagram.
If no malfunction is found, but leak diagnosis pump is not functional during output diagnostic test mode:
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Replace Leak Detection Pump (LDP) V144
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Observe procedures for after re-connecting engine control module (ECM).
Checking input wiring
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Switch off ignition.
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Connect test box V.A.G 1598/31 to wiring harness connectors, with Engine Control Module (ECM) not connected. Connect Ground (GND) clip at
test box to Ground (GND) (not visible in illustration). See: Computers and Control Systems/Testing and Inspection/Reading and Clearing
Diagnostic Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring and Component Test
CAUTION: To avoid damaging electronic components, switch to the corresponding measuring range and observe all test conditions before