Synchronization sensor - inductive type (2612.1.113 Bosch or 406.3847113) is installed on the front end of the engine at the bottom, on the right side and is designed to synchronize the operation of the control unit with the engine workflow

The sensor is a bar magnet with a winding wound over it and enclosed in a high-strength plastic housing.

When the teeth of the synchronization disk pass, past the end of the core, a signal appears on the sensor terminals that carries information about the crankshaft speed, and two teeth missing on the synchronization disk cause a signal pulse by which the control unit determines the top dead center (TDC) of the first cylinder .

Sync sensor: 1 - sensor; 2 - sensor mounting bolt; 3 - sensor wire; 4 - synchronization disk

If the synchronization sensor and its circuits fail, the engine will not work.

The control unit will memorize the fault code and turn on the KMSUD alarm lamp on the dashboard.

Timing Sensor Test

Turn off the ignition and disconnect the "negative" terminal of the battery.

Checking and replacing the ZMZ-406 synchronization sensor

Use a thin screwdriver or an awl to remove the spring clip of the shoe.

Checking and replacing the ZMZ-406 synchronization sensor

Disconnect the sync sensor connector.

Checking and replacing the ZMZ-406 synchronization sensor

Connect an ohmmeter to the central and one side output.

Checking and replacing the ZMZ-406 synchronization sensor

We measure the resistance of the sensor winding, which should be in the range of 700-900 Ohm.

Checking and replacing the ZMZ-406 synchronization sensor

To further check the health of the sensor, remove it from the engine.

You can verify that the sensor is working by connecting a voltmeter to its outputs

Checking and replacing the ZMZ-406 synchronization sensor

We quickly bring the metal rod to the core of the sensor - if it is working, voltage surges are observed on the device.

We replace the defective sensor.

Removing the timing sensor

Checking and replacing the ZMZ-406 synchronization sensor

Using the “10” key, we unscrew the bolt securing the sensor to the engine block

Checking and replacing the ZMZ-406 synchronization sensor

Remove the sensor from the hole.

Bending the sensor wire clamps located on the intake manifold and cylinder block, pull the wire down together with the connector

Install the sensor in reverse order.

After installing the sensor, we check the gap between its rod and the teeth of the synchronization disk using a set of probes.

The gap should be within 1-1.5 mm.

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Repair of the crankshaft consists of regrinding the main and connecting rod journals to the next repair size

The hydraulic clutch release (Fig. 1) of vehicles of the UAZ-31512 family consists of a suspended pedal 19, a master cylinder 5, a hydraulic pipe 4, a hydraulic hose 24 and a working cylinder 25