The speed and timing sensor is located at the front of the engine on the right side

Using the sensor signal, the engine control unit determines the angular position of the crankshaft and its rotation speed

By the frequency of signals generated by the sensor when rotating the synchronization disk mounted on the crankshaft pulley, the control unit determines the engine crankshaft speed, synchronizing the fuel supply by the injectors and the ignition timing with the engine operating process.

If the crankshaft position sensor fails, the engine will not start, since the control unit, without receiving a signal from the sensor, will not turn on the injection and ignition systems.

Disconnect the wire from the negative terminal of the battery.

Disconnect the connector for wire 3 of the sensor, located behind the engine intake pipe.

Replacing the synchronization sensor GAZ-2705

Unscrew bolt 2 and remove sensor 1.

Check the resistance of the sensor coil with an ohmmeter, it should be in the range of 850-900 Ohms.

If the resistance value does not fall within the specified limits, replace the sensor.

Install the sensor in reverse order.

For normal operation of the sensor, the gap “a” between sensor 1 and synchronization disk 4 must be within 1.0-1.5 mm.

Checking the timing sensor

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

Checking the synchronization sensor

Use a thin screwdriver or awl to remove the spring clamp of the block.

Checking the synchronization sensor

Disconnect the synchronization sensor connector.

Checking the synchronization sensor

Connect an ohmmeter to the central and one side terminal.

Checking the synchronization sensor

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

Checking the synchronization sensor

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

You can verify the functionality of the sensor by connecting a voltmeter to its terminals

Checking the synchronization sensor

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

We replace the faulty sensor.

Removing the timing sensor

Removing the synchronization sensor

Use a 10mm wrench to unscrew the bolt securing the sensor to the engine block

Removing the synchronization sensor

Remove the sensor from the hole.

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

Install the sensor in reverse order.

After installing the sensor, use a set of feeler gauges to check the gap between its rod and the teeth of the synchronization disk.

The gap should be within 1-1.5 mm.