Secondary Air Injection (AIR) Solenoid Valve -N112-, Checking

Secondary Air Injection (AIR) Solenoid Valve -N112, checking

- 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" Testing and Inspection
When doing this the ignition must be switched on.
- Start output Diagnostic Test Mode (DTM) and activate secondary air injection valve. Refer to Scan Tool Testing/Output Diagnostic Test Mode (DTM) (Function 03) 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:







- Disconnect 2-pin harness connector from valve.
- Connect VAG1527B diode test lamp to disconnected connector using test leads from VAG1594 connector test kit.
- Repeat DTM.

If the diode test lamp now blinks during the DTM:
- Replace secondary air injection valve.

If the diode test lamp still does not flash:
- Switch ignition off.
- 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" Testing and Inspection

- 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:
- Test voltage supply to secondary air injection valve using wiring diagram.
- 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" Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" Testing and Inspection