A4 Sedan L4-1.8L Turbo (AWM) (2001)
Testing/Scan Tool Connecting and Initial Checks/VAS 5051 Tester, Connecting and Selecting Functions" See: Powertrain
Management/Computers and Control Systems/Testing and Inspection
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Initiate output Diagnostic Test Mode (DIM) and activate Evaporative Emission (EVAP) canister purge regulator valve -N80-.
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Fuel Pump (FP) relay (at position 4 of central electronics in driver's footwell, left) must trigger and Fuel Pump (FP) must run.
A - If relay does not trigger:
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Check voltage supply of Fuel Pump (FP) relay.
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Checking activation of Fuel Pump (FP) relay.
B - If relay triggers, but Fuel Pump (FP) does not run:
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Check voltage supply for Fuel Pump (FP) and components (via Fuel Pump - FP- relay).
Check voltage supply of Fuel Pump (FP) relay
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Remove Fuel Pump (FP) relay.
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Connect multimeter to terminal 17 of relay socket and Ground (GND) for voltage measurement.
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Specification: approx. battery voltage
If specified value is not obtained:
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Replace central electronics.
Checking activation of Fuel Pump (FP) relay
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Switch ignition off.
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Connect VAG1598/31 test box at wiring harness to Engine Control Module (ECM), do not connect ECM. Refer to "Scan Tool Testing/Wire and
Component Testing Using VAG1598/31 Test Box" See: Powertrain Management/Computers and Control Systems/Testing and Inspection
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Switch ignition on.
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Bridge terminals 1 and 65 at test box using wires from VAG1594A adapter test kit.