Checking Operation

Required special tools and test equipment
- VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
- VAG 1598/22 test box

Checking
- Start output Diagnostic Test Mode (DTM) for secondary air (AIR) injection solenoid valve -N112-. Refer to On-Board Diagnostics II in Computers and Control Systems/System Diagnosis. Testing and Inspection

Indicated on display

Output Diagnostic Test Mode ->
Secondary Air inject. Solenoid Valve -N112

The valve will click until pressing the -> button to advance the program sequence.

If the secondary air injection valve does not click:
- Disconnect the 2 pin harness connector from the secondary air injection valve.
- Connect VAG 1527B LED voltage tester to the harness connector terminals.
LED must blink.

If LED test light blinks.:
- Replace secondary air injection valve.

If LED test light does not blink:
- Check voltage supply to valve using applicable wiring diagram.

If the voltage supply to the valve is OK:
- Switch ignition off.





- Connect VAG 1598/22 test box to ECM harness connector.
- Check wiring between test box socket 33 and terminal 2 of 2-pin connector.
Specified value: max. 1.5 Ohms

If wiring is OK:
- Replace Motronic ECM -J220-.
- Carry out adaptation of throttle valve control module to ECM.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.