A8 Quattro Sedan V8-4.2L (AUX) (2001)
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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+.
Electrical harness
VAG1598/31
connector terminal
test box socket
2
25
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Repair open circuit or short circuit if necessary.
If no malfunction is identified, but the Leak Detection Pump (LDP) does not function during the output Diagnostic Test Mode (DTM).
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Replace Leak Detection Pump (LDP) -V144.
If LED does not blink, but wiring is OK
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Replace Engine Control Module (ECM).
After completing work:
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Generate readiness code.
If there is no DTC stored:
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Check input wire.
Checking input wire
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Switch ignition off.
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Connect VAG1598/31 test box to multi-pin harness connectors, refer to "Checking output wire".