K-Jetronic. Functional check
Turn on the ignition and check if the control valve buzzes and vibrates. If so, then perform a control check.
Otherwise, disconnect the control valve plug, connect an ohmmeter to both plug contacts and check the conductivity. The prescribed resistance value is negligible.
Check the temperature sensor. If no fault is found, check the wiring and connection points in accordance with the electrical diagram, replace the control unit if necessary (workshop work).
Checking the regulation
Prerequisite for checking: idle speed adjustment must be ok.
Warm up the engine until the engine oil temperature is not lower than +80°C.
With the ignition off, connect an ammeter between the control valve and the plug connector in accordance with the operating manual(serial connection).
Turn off all electrical consumers, including the air conditioning system.
Start the engine and let it idle.
Measure and record the control current supplied to the control valve.
Use pliers to squeeze the idle speed control hose. The control current should increase.
Open the hose, the control current should decrease.
The control current should drop to below approximately 430 mA. If the current does not drop below 430 mA, check the components in the following sequence.
Check the throttle position sensor.
In accordance with the electrical diagram, check the wiring and connection points; if necessary, replace the control unit.
Disconnect the plug connector above the ignition coil. Measure the control current again. The specified value is 415445 mA. If the measured value is outside the specified range, replace the control unit.
Remove measuring instruments.
If the stabilization system parts were replaced, check the idle speed and CO content adjustments and adjust the specified values if necessary.
Visitor comments