1. Disconnect from the entrance union of the measuring instrument of a stream of air. Carefully open and close the gate of the sensor and check jamming existence. The gate at backfires can be bent and it to lead to the wrong measurements of resistance. The gate can be bent and remain in partially open situation, causing enrichment of mix and a stop of the engine idling.

3. Check an ohmmeter resistance between contacts 7 and 8. Resistance has to increase constantly (without "flat sites") at slow movement of the gate of the sensor from completely closed position in completely open.

5. If resistance sizes correct, check cables (watch the Head Sistem of onboard electric equipment). Attach the socket to the stream measuring instrument. Make sure that ignition is switched off. Disconnect the socket from ECU (it is located under the dashboard on the right) and check an ohmmeter resistance between contact 7 and 8. Carefully uncover with the measuring instrument a stream and observe change of resistance when moving from a closed position to completely open. The result of check has to be same, as at the previous check. If in results any differences are observed, then in a cable there can be breaks or short circuits.

1. Make sure that ignition is switched off. Uncover access to ECU (watch Chapter of the Control system of the engine and decrease in toxicity of the fulfilled gases) and disconnect the cable socket.

2. Check an ohmmeter resistance between noted contacts of the electric ECU socket and check change of resistance when moving a petal. On the early Motronic systems use contacts 7 and 9.

3. On late models - contacts 7 and 12.

The early Motronic systems differ in the 35-contact electric socket; in the late Motronic systems the 55-contact socket is used.

3. Turn off nuts and take the stream measuring instrument from a motive compartment or from the air cleaner.