S4 V8-4.2L (BHF) (2004)
Fuel Pump Relay: Testing and Inspection
Fuel Pump (FP) Relay -J17- And Activation, Checking
Recommended special tools and equipment
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V.A.G 1526A multimeter
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V.A.G 1594A connector test kit
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V.A.G 1598/31 test box
Voltage is supplied to the Fuel Pump (FP) and several components of the injection system via the Fuel Pump (FP) Relay - J17-.
Engine must be turning for Fuel Pump (FP) Relay -J17- to close. This means that the relay does not receive Ground (GND) (via ECM) until the ECM
recognizes RPM signals.
Test requirements:
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Battery voltage at least 12.5 V
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Ignition switched off.
Function test of Fuel Pump (FP) relay
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Remove driver-side storage compartment.
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Connect test box to wiring harness of Engine Control Module (ECM), ECM is not connected. 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
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Bridge terminals 1 and 65 at test box using wires e.g. from V.A.G 1594 A adapter test kit.
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Switch ignition on.