Contents: On a cold engine ⬇ On a warm engine ⬇
On a cold engine
Pinch the air hose between the additional air supply valve and the engine intake manifold. This should reduce the crankshaft speed.
On a warm engine
Make sure the additional air supply valve flap is completely closed.
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Pinch the air hose between the valve and the engine intake manifold. The crankshaft speed should not change.
Disconnect the connector from the additional air supply valve and connect the test lamp to the connector terminals. Turn on the ignition, the test lamp should light up.
Connect an ohmmeter to the terminals of the additional air supply valve (see picture) and measure the resistance, which should be within 40-75 Ohms.
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