Checking activation

Connect VAG 1527B voltage tester between terminal 1 and 2.

Fig 1: Identifying Secondary Air Injection Solenoid Valve Harness Connector Terminals
Courtesy of AUDI OF AMERICA, INC.
Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air Injection (AIR) solenoid valve -N112-.
See OUTPUT DIAGNOSTIC TEST MODE (DTM) .

Fig 2: Display Diagnostic Test Mode (Air Control Valve For Injectors -N112)
Courtesy of AUDI OF AMERICA, INC.

Indicated on display
- LED must blink.
If LED does not blink or if it remains constantly lit:
Connect VAG 1598/31 test box at wiring harness to ECM, do not connect ECM.
See WIRING AND COMPONENT CHECK WITH VAG1598/31 TEST BOX .

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

SECONDARY AIR INJECTION SOLENOID VALVE CIRCUIT TEST

Harness connector terminal	VAG 1598/31 test box Bushing
2	44

Repair open circuit or short circuit if necessary.

Fig 3: Identifying Secondary Air Injection Solenoid Valve Harness Connector Terminals
Courtesy of AUDI OF AMERICA, INC.

If wire connection is OK:
Replace Engine Control Module (ECM).
See MOTRONIC ENGINE CONTROL MODULE (ECM) -J220- (WITHOUT METAL ANTI -THEFT HOUSING), REPLACING or MOTRONIC ENGINE CONTROL MODULE (ECM) -J220- (WITH METAL ANTI -THEFT HOUSING), REPLACING .