With Generic Scan Tool

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

Recommended special tools and equipment







- VAG1526A multimeter
- V.A.G 1527 B Voltage Tester
- VAG1594A connector test kit
- VAG1598/31 test box

Test requirements:
- Fuse for Secondary Air Injection (AIR) OK
- Fuel Pump (FP) Relay OK; checking. Testing and Inspection
- Ignition switched off.

NOTE: Voltage is supplied to Secondary Air Injection (AIR) Solenoid Valve -N112- via the Fuel Pump (FP) relay.

Procedure







- Remove rear engine cover (arrows).

Checking internal resistance







- Disconnect harness connector from Secondary Air Injection (AIR) Solenoid Valve -N112- (arrow).







- Connect multimeter at valve for resistance measurement.
- Specified value: 25 ... 35 Ohm

If specified value is not obtained:
- Replace Secondary Air Injection (AIR) Solenoid Valve -N112-.

If specified value is obtained:

Checking voltage supply







- Connect VAG1527B voltage tester as follows:

Harness connector Measure to
Terminal
1 Engine Ground (GND)

- Operate starter briefly.
- LED must light up.
- Switch ignition off.

If LED does not light up:

- Check wire connection from harness connector terminal 1 to Fuel Pump (FP) Relay -J17- via fuse for open circuit according to wiring diagram.
- Specified value: Wire resistance max 1.5 Ohm
- If necessary, repair wire connection.

If LED lights up:

Checking control wire
- Connect test box to wiring harness of Engine Control Module (ECM); ECM is not connected. Text Box, Connecting For Wiring Test







- Check the following wire connection for open circuit according to wiring diagram:

Harness connector Test box
Terminal Socket
2 44

- Specified value: Wire resistance max 1.5 Ohm

- Also check the wire for short circuit to B+ and Ground (GND).
- Specified value: infinity Ohm (no continuity)

- If necessary, repair wire connection.

If no malfunctions are found in wire:
- Replace Engine Control Module (ECM).

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1 - Check DTC memory, "Mode 3: Check DTC memory". Diagnostic Mode 3: Check DTC Memory
2 - If necessary, erase DTC memory, "Mode 4: Reset/erase diagnostic data". Diagnostic Mode 4: Check Reset/Erase Diagnostic Data
3 - Generate readiness code. Readiness Code, Generating

- End diagnosis and switch ignition off.