Secondary Air Combination Valve, Checking

The following procedure is used to test all combination valves.

Special tools and workshop equipment required 

• Hand vacuum pump.

Test conditions 

• Secondary air injection (AIR) solenoid valve -N112- OK.
• Secondary air injection (AIR) solenoid valve 2 -N320- OK
• Check vacuum system, including vacuum reservoir in intake manifold, for leaks.
• Check that the vacuum lines are correctly connected.
• Check the vacuum hoses for damage.
• Vacuum lines not plugged.

Test sequence 

-- Remove the vacuum hose from the combination valve.

-- Connect hand vacuum pump to combination valve vacuum connection.

-- Disconnect the Secondary Air Injection hose -arrow-.

-- Inject a light air pressure into the in Secondary Air Injection hose to close the combination valve (do not use compressed air).

• The combination valve should close and seal. Air should not be able to pass through the combination valve.

-- Operate the hand vacuum pump.

• The combination valve should open. Air should be able to pass through the combination valve.

If combination valve does not open:

-- Replace the faulty combination valve.