S4 V8-4.2L (BHF) (2004)
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Connect multimeter for voltage measurement as follows.
3-pin relay carrier, E-box plenum chamber, position 2 Terminal
Measure to
4
Engine Ground (GND)
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Operate starter briefly (engine can also start).
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Specified value: approx. battery voltage
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Switch ignition off.
If specified value is not obtained:
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Check wire connection from Secondary Air Injection (AIR) Pump Relay -J299- (in 3-pin relay carrier, E-box plenum chamber) to Fuel Pump (FP)
relay via Fuse -S234- (in fuse holder, position 34) for open circuit according to wiring diagram.
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Specified value: Wire resistance max 1.5 Ohms
Check activation of the Secondary Air Injection (AIR) pump relay
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Remove Secondary Air Injection (AIR) pump relay from position -2- of 3-pin relay carrier, E-box, plenum chamber.
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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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Check the following wire connection for open circuit according to wiring diagram:
3-pin relay carrier, E-box plenum chamber, position 2 Terminal
Testbox Socket
6
46