Switch off the ignition. Connect test cord VAG 1591 (pos. 4 fig. 2-205) to the terminals of the potentiometer and the connecting block. Attach a digital voltmeter to the blocks «1» and «3» test cord. Turn on the ignition. In this case, the voltmeter should show a voltage of 4.3-5.3 V.
Switch off the ignition. Attach a voltmeter to the blocks «2» and «3 «test cord. Start the engine at idle. In this case, the voltage on the voltmeter should be within 0.5-0.7 V. If the voltage is outside the specified limits, check the tightness of the air path from the air flow meter to the engine cylinder head. If necessary, adjust the voltage value by turning the adjusting screw 5. After completing the adjustment, lock the adjusting screw with silicone glue.
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