On a cold engine
Pinch the air hose between the auxiliary air supply valve and the engine intake pipe. In this case, the frequency of rotation of the crankshaft should decrease.
On a warm engine
Make sure the auxiliary air damper damper is fully closed.
Pinch the air hose between the valve and the engine intake pipe. In this case, the frequency of rotation of the crankshaft should not change.
Disconnect the block from the auxiliary air supply valve and attach a test lamp to the block terminals. Switch on the ignition, the control lamp should light up.
Connect an ohmmeter to the terminals of the auxiliary air supply valve (see picture) and measure the resistance, which should be in the range of 40-75 ohms.
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