Examination
Models with manual transmission
1. Disconnect the sensor harness connector. Measure the voltage at the connector with a voltmeter (from the harness side). The positive probe of the voltmeter should be connected to the black-yellow wire terminal, the negative one to ground. There should be battery voltage at the connector. If there is no power, check the condition of the VSS wiring between the sensor and the fuse box (on the left under the instrument panel). Also make sure the fuse itself is good. Using an ohmmeter, check for continuity between the black wire terminal of the connector and ground. If there is no continuity, check the condition of the black wire and the quality of its terminal connections.
2. Jack up the front of the car and place it on jack stands. Chock the rear wheels and place the transmission in neutral. Connect the wiring to the VSS, turn on the ignition (do not start the engine) and test the signal terminal with a voltmeter (blue and white) wires on the back of the connector (connect the negative test lead to body ground). Keeping one of the front wheels stationary,
manually turn the opposite, the voltage should fluctuate between zero and 5 V, otherwise replace the VSS.
Models with AT
3. Disconnect the wiring from the appropriate speed sensor. Using an ohmmeter, measure the resistance between the two terminals of the sensor. The nominal value is approximately 400÷600 Ohm, otherwise replace the sensor.
Replacement
1. Disconnect the wiring from the speed sensor.
2. Turn out the fixing screw and remove the gauge from a case of transmission.
3. Installation is carried out in the reverse order. Don't forget to replace the o-ring.