Mono-Jetronic
A malfunction in the adjustment of the oxygen sensor is checked by interrogating the memory device for trouble codes. Query the storage device.
If the code 2 3 4 2 appears, then after that it is necessary to check that the sensor has a supply voltage.
Examination
Connect a tachometer or ask an assistant to read the readings from the instrument panel.
Start the engine and leave it to idle.
Unplug connector -1- for oxygen sensor and use a semiconductor lamp to check for the presence of voltage on both pins of the connector (arrow). The LED should be on.
Slowly increase engine speed. Up to a speed of 3700 1/min the LED should light up, and above approx. 3700 1/min it should go out. Otherwise, there is a defect in the relay in position 3 of the relay board or a defect in the wiring. Find the malfunction in accordance with the electrical diagram and eliminate it.
After troubleshooting, erase the trouble codes from the memory device. Finally, carry out a test drive for at least 10 minutes and then repeat the test.
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