Examination
Disconnect the connector from the sensor.
Connect an ohmmeter to the sensor terminals.
Measure the resistance and compare it with one of the above values.
If the resistance is not within the specified value, remove the sensor.
Hang the sensor on a wire in a container with water so that it does not touch the walls of the container. Cool the water with ice, and then heat it on the stove. Remove the sensor at the temperatures indicated in the above table and measure its resistance. Replace sensor if necessary.
If the sensor is OK, connect a voltmeter to the sensor contact and "mass" (in the Multec system connect to "mass" pin B of the diagnostic connector).
Turn on the ignition. The voltmeter should show 5.1 V. If there is no voltage, check the connections.
If the wires and the sensor are in order, then there is a malfunction in the computer.
Removing
Attention! To prevent leakage of coolant when replacing the sensor, it is necessary to first drain some of the coolant into an appropriate container.
Multitec system
Motronic and Ecotronic systems
Disconnect connector (see fig.).
Unscrew the sensor.
Installation
Screw the sensor back into place with a new O-ring and tighten to 10 Nm.
Attention! Do not exceed the tightening torque of the sensor!
Connect connector.
Fill with coolant.
Release air from the cooling system.
Take a test drive and check the tightness of the connections. Tighten the sensor if necessary.
Visitor comments