Secondary Air Injection Valve, Checking

Solenoid valve is closed when no voltage is present.

Special tools and workshop equipment required 

• Multimeter VAG 1526 or Multimeter VAG 1715
• Connector test kit VAG 1594
• Wiring diagram

Test requirements 

• Fuses in E-box (plenum chamber, left) must be OK: Refer to appropriate SYSTEMS WIRING DIAGRAM
  Fig 1: Identifying Fuses In E-Box (Plenum Chamber, Left)

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• The respective fuses of Secondary Air Injection (AIR) Solenoid Valve -N112- must be OK: Refer to appropriate SYSTEMS WIRING DIAGRAM
  Fig 2: Identifying Fuse Box (Instrument Panel, Left)

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• Ground (GND) connections between engine and chassis must be OK.
• Ignition switched off.

Test sequence 

-- Disconnect 2-pin connector from Secondary Air Injection (AIR) Solenoid Valve -N112- (arrow).

Checking resistance 

-- Measure resistance between terminals of solenoid valve.

Specified value: 55.0 to 65.0 Ω

If specified value is not obtained:

-- Replace Secondary Air Injection (AIR) Solenoid Valve -N112-.

-- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.

-- Generate readiness code.

If specified value is obtained:

-- Check wires according to wiring diagram.

Checking wiring 

-- Connect test box to control module wiring harness, connect test box for wiring test.

-- Check wire between test box socket 44 + 2-pin connector terminal 2 for open circuit according to wiring diagram.

Wire resistance: max. 1.5 Ω

-- Check wire for short circuit to B+ and Ground (GND).

Specified value: ∞ Ω

-- Check wire between 2-pin connector terminal 1 and the B+ connection in wiring harness for open circuit according to wiring diagram.

Wire resistance: max. 1.5 Ω

-- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.

-- Generate readiness code.

If no malfunctions are found in wires:

-- Replace Motronic Engine Control Module (ECM) -J220-.

Final Procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .