Disconnect the plug from the temperature sensor and measure the resistance against ground with an ohmmeter. On a 5-cylinder engine with KE-Jetronic, check in turn the resistance of the contacts relative to ground; pin 1 for control unit KE, pin 2 for control unit VEZ.
Compare the obtained values with those required by the diagram. Example: At a coolant temperature of +20 C, the device should show a resistance of 2-3 kOhm, at +80°C - 290 + 370 Ohm.
Attention: Always check for 2 different temperatures. If necessary, remove the temperature sensor and heat in a water bath.
If the resistance is out of range, replace the sensor.
Diagram for 5-cylinder engine with K-Jetronic system
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