A8L Quattro Sedan V8-4.2L (AKB) (2002)
Air Injection Vacuum Control Solenoid Valve: Testing and Inspection
Secondary Air Injection (AIR) Solenoid Valve -N112, checking
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Connect vehicle diagnostic, testing and information system VAS5051 or VAG1551 scan tool and select engine electronics control module by
entering address word "01". Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAS5051 or VAG1551" See:
Computers and Control Systems/Testing and Inspection
When doing this the ignition must be switched on.
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Start output Diagnostic Test Mode (DTM) and activate secondary air injection valve. Refer to Scan Tool Testing/Output Diagnostic Test Mode
(DTM) (Function 03) See: Computers and Control Systems/Testing and Inspection
Indicated on display:
Output Diagnostic Test Mode
->
Secondary Air Injection (AIR) Valve -N112
The secondary air inlet valve should click. If the secondary air inlet valve does not click:
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Disconnect 2-pin harness connector from valve.
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Connect VAG1527B diode test lamp to disconnected connector using test leads from VAG1594 connector test kit.
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Repeat DTM.
If the diode test lamp now blinks during the DTM:
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Replace secondary air injection valve.
If the diode test lamp still does not flash:
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Switch ignition off.
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Connect VAG1598/31 test box to wiring harness for engine control unit. Do not connect to the engine control module itself. Refer to "Scan Tool
Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" See: Computers and Control Systems/Testing and
Inspection
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Check for open circuit in the following wiring connection:
Socket of 2-pin
Socket on VAG1598/31
connector on
test box
wiring harness
2
44
Resistance in wiring: max. 1.5 ohm
If no malfunction in wire is detected:
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Test voltage supply to secondary air injection valve using wiring diagram.
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Display readiness code. The readiness code must be generated if the DTC memory was erased.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Readiness Code" See: Computers and Control Systems/Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" See: Computers and Control Systems/Testing and
Inspection