Mono-Jetronic
The potentiometer transmits information about the throttle position to the control unit. The control unit uses this information to control the operation of the valve injector, oxygen sensor, idle speed and CO content. A break in the wires of the electric circuit of the potentiometer causes a long glow of the malfunction indicator of the vehicle's self-diagnosis system.
Press the locking tabs and disconnect the potentiometer plug.
Measure the resistance between contacts 1 and 5 of the connector with an ohmmeter. The prescribed resistance value is 520-1300 Ohms.
Measure the resistance between contacts 1 and 2. At the same time, slowly open the throttle valve. At first, the resistance should change, and after the valve opens by 1/4, it should remain unchanged. The minimum resistance value should be 600 Ohms, and the maximum - 3500 Ohms.
Measure the resistance between contacts 1 and 4, while slowly opening the flap by hand again. Until the flap has traveled 1/4 of its distance, the resistance should remain constant, and then it should change. The prescribed values are: maximum - 6600 Ohm, minimum - 600 Ohm.
If the resistance does not change or the specified value is not reached, the entire lower part of the central injection system must be replaced. Replacement or adjustment of the throttle potentiometer is not permitted.
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