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

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

Special tools and equipment






- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31
- VAS5051 tester

or

- VAG1551 with VAG1551/3B

Test requirement:
- Output Diagnostic Test Mode (DTM) performed

Checking internal resistance
- Disconnect harness connector from Secondary Air Injection (AIR) valve -N112-.






- Connect multimeter at valve for resistance measurement.
- Specification: 25 to 35 ohm
- If specified value is not obtained, replace Secondary Air Injection (AIR) solenoid valve -N112-.

Checking voltage supply
- Disconnect harness connector from Secondary Air Injection (AIR) valve -N112-.






- Connect VAG1527B voltage tester as follows:

Harness connector Measure to
Terminal
1 Engine Ground (GND)

- Operate starter briefly (engine can also start).
- LED must light up.

If LED does not light up:
- Perform the following tests marked with dots:






- Check fuse S243 (in fuse holder, position 43).






- Check wire connection from terminal 1 of connector via fuse S243 (in fuse holder, socket 43) to Fuel Pump (FP) relay for open circuit:
- Check Fuel Pump (FP) relay. Fuel Pump (Fp) Relay -J17-, Testing and Activating

Checking activation






- Connect VAG1527B voltage tester as follows:

Harness connector Measure to
Terminal
2 B+

- Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air Injection (AIR) solenoid valve -N112-. With Manufacturer's Scan Tool

Indicated on display


Output Diagnostic Test Mode ->
Secondary air injection solenoid valve -N112


- LED must blink.

If LED does not blink or if it remains constantly lit:
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Wiring and Component Testing Using VAG1598/31 Test Box






- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:

Harness connector VAG1598/31 test box
Terminal Socket
2 9

- Repair open circuit or short circuit if necessary.

If wire connection is OK:
- Replace Engine Control Module (ECM).