Possible causes

– Faulty VVEL Actuator Motor
– VVEL Actuator Motor harness is open or shorted
– VVEL Actuator Motor circuit poor electrical connection
– Faulty VVEL actuator sub assembly
– Faulty VVEL ladder assembly
– Faulty VVEL control module

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1090 NISSAN Description

VVEL (Variable Valve Event & Lift) is a system that controls valve event and valve lift continuously. Rotational movement of the drive shaft equipped with eccentric cam is transmitted to output cam via the rocker arm and two kinds of links to depress the intake valve. The Engine Control Module (ECM) decides the target valve lift according to the driving condition and sends the command signal to the VVEL control module. The VVEL control module controls the rotation of the control shaft using the VVEL actuator motor and changes the movement of the output cam by shifting the link supporting point. As a result, valve lift changes continuously to improve engine output and response.