How do fix obd code p1349 vvt system malfunction on my 2002 echo?

Question

P1349 vvt system malfunction

Answer 1

The VVT system constantly adjusts intake valve timing based upon operating conditions. The ECM controls

the Oil Control Valve (OCV) with a variable duty cycle. The Oil Control Valve then supplies oil to the advance

or retard side of the VVT Controller. The oil applied to the VVT Controller will cause the intake cam to advance

or retard depending on the position of the Oil Control Valve. The ECM verifies that the desired camshaft

angle has been achieved by monitoring the camshaft position sensor

 

check to see if you are low on oil, if the oil is dirty. if its been over 3,750 miles since your last oil change replace the oil.
the toyota manual says Check operation of OCV with the TOYOTA hand-held tester.

 

 

 

possible causes:

Valve timing

Oil control valve

VVT controller assembly

ECM

 

the timing will need to be checked