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A Toyota RAV4 arrived for diagnostics with complaints that the engine control units have errors in the valve timing system, VVTI valve timing. The camshaft angle change system. Diagnostics using the Launch scanner, diazone Kingbolen Ediag Thinkcar Thinkdiag Launch showed errors in the valve and VVTI clutch. We check the power supply pulse on the valve, solenoid change of valve timing. We check the operation of the valve using the scanner function test of actuator components. We check the separately removed valve using a component and actuator tester called QDB-2A. I also order a new original valve, the video shows the valve number for the order and also check this valve on the same component tester. The valves work differently, which is clearly visible. But replacing the valve did not change the engine operation, the car was sent to a mechanic for disassembly in the upper part of the engine, namely, removing the valve cover, removing the camshaft and diagnosing the mechanical part of the VVTI system itself. It was determined that the clutch was jammed from varnish deposits in the oil. After replacing the clutch, we test the actuators on the car using a scanner. Upon completion of all procedures and repairs, the replacement was re-tested, which already showed that everything works as it should.