Checking control and measuring instruments (VAZ-2101)

The accuracy of the devices must be checked on the bench, comparing the readings of the devices with the calibration data given above. Below are methods for determining malfunctions in the operation of the devices.

Coolant temperature gauge

If the pointer is constantly opposite the "0" mark, then with the ignition on, disconnect the wire from the pointer sensor and connect the tip of the wire to ground. If the pointer deflects, the sensor is faulty and must be replaced. If the pointer does not deflect, remove the instrument cluster from the instrument panel, remove the right (red) connector and, with the ignition on, connect the instrument cluster plug to ground, to which the green wire from the sensor is connected. In this case, the deflection of the pointer indicates that the device is working properly and that the wire connecting the pointer sensor to the instrument cluster is damaged. If the pointer does not deflect, replace the device or the entire instrument cluster.

If the pointer is constantly in the red zone, then with the ignition on, disconnect the wire from the sensor. If the sensor is faulty, the pointer should return to the "0" mark. If the pointer remains in the red zone, then either the wire has a short circuit with the ground, or the device is damaged. The serviceability of the device can be checked by disconnecting the right (red) block of the instrument cluster. With the ignition on, the pointer should be at the "0" mark.

Fuel level indicator

The testing method is similar to that described above. It should be noted that the wire going to the fuel reserve indicator lamp is connected to the "W" plug of the gauge sensor, and the wire going to the gauge itself is connected to the "T" plug.

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If the pointer of the indicator is constantly at the beginning of the scale and does not deflect after short-circuiting the tip of the wire disconnected from the "T" sensor plug with the mass, then it is necessary to check the device. To do this, remove the instrument cluster, disconnect the right (red) connector from it and, with the ignition on, connect the instrument cluster plug to the mass to which the pink wire goes. If the device is in good working order, the pointer should deflect.