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 VAG 1551 Scan Tool and select engine electronics control module by entering address word "01", [1][2]Scan Tool Connecting and Initial Checks. When doing this the ignition must be switched on.
- Start output Diagnostic Test Mode (DTM) and activate secondary air injection valve, Output Diagnostic Test Mode (DTM) (Function 03)

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 solenoid valve.
- Connect VAG 1527 diode test lamp to disconnected connector using test leads from VAG 1594 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 VAG 1598/31 test box to wiring harness for engine control unit. DO NOT connect to engine control module itself, Connecting VAG 1598/31 Test Box
- Check for open circuit in the following wiring connection:

Socket of 2-pin Socket on VAG 1598/31
connector on wiring test box
Socket on VAG 1598/31
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, Readiness Code Reading . Readiness code must be generated if DTC memory was erased, Readiness Code, Generating