S4 V8-4.2L (BHF) (2004)
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Valve must click
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Valve must open and close (can be tested by blowing into assisting hose)
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End function "03 - output Diagnostic Test Mode (DTM)" by pressing button.
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Select "06 - End Output".
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Switch ignition off.
If valve does not open or close properly:
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Replace Secondary Air Injection (AIR) Solenoid Valve -N112-.
If valve does not click during output Diagnostic Test Mode (DTM):
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Check internal resistance.
Checking internal resistance
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Disconnect electrical harness connector from Secondary Air Injection (AIR) Solenoid Valve -N112- - arrow -.
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Connect multimeter to valve for resistance measurement.
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Specified value: 19 to 27
If specified value is not obtained:
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Replace Secondary Air Injection (AIR) Solenoid Valve -N112-.
If specified value is obtained:
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Check voltage supply.
Checking voltage supply
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Fuse for Secondary Air Injection (AIR) solenoid valve OK Electrical Wiring Diagrams, Troubleshooting Component Locations
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Fuel Pump (FP) Relay -J17- OK
NOTE: Voltage is supplied to the Secondary Air Injection (AIR) Solenoid Valve -N112- via the Fuel Pump (FP) Relay -J17-.