Testing internal resistance

• Switch off ignition.
• Unplug connector from Secondary Air Injection (AIR) Solenoid Valve -N112- (arrow).
Fig 1: Unplugging Connector From Secondary Air Injection (Air) Solenoid Valve
Courtesy of AUDI OF AMERICA, INC.

• Connect multimeter to valve (resistance measurement range)
  • Specification: 25 to 35 Ω

Fig 2: Measuring Secondary Air Injection (Air) Solenoid Valve Resistance

Courtesy of AUDI OF AMERICA, INC.

If specification is not attained:

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

If specification is obtained, go to CHECKING VOLTAGE SUPPLY .