The problem is P1653 scv motor circuit. to Toyota Rav 4 engen no 1Az

The code reads as:
P1653 = SCV Circuit Malfunction / 58
An SCV is a Suction Control Valve. This is a valve that regulates fuel pressure as it reaches the injectors. If it starts to fail, the vehicle will run badly and use more fuel. The vehicle may even refuse to start.
They are not too expensive and a good mechanic will be able to change it quite quickly.

on one of the forum ages code p 1653 refers to SC V motor circuit
toyota recommended the change of both vacuum valve assembly parts T25860, -OHO30 and T25860-28070
the c person asking the question replaced the units and to date the problem was fixed
go google and type in --toyotanation.com as this is a forum page and most replies state that it is a vacuun valve assembly problem
one person had this to say the following malfunctions were experienced
VCS, VCSoff and engine check light on
the gear is alternately was stuck on overdrive --stay at the 3rd gear ( the od light not on)
the computer code reported a p1653 malfunction code
after replacing the vacuum valve assembly the symptoms went and haven't come back
any way go google and type in-- fault code p 1653 for toyota --and search pages to get a better understanding of what is wrong

I googled: Toyota RAV4 rav4l fault code p1653scv motor circuit
This one looks like some good answers from owners:
http://www.toyotanation.com/forum/155-2nd-generation-2000-2004/161206-vsc-vsc-off-check-engine-code-p1653-2.html

Scv for toyota caldina

Do you mean VSC= vehicle stability control light
Scv may be for radio. Speed control volume.
Check engine light is on, where did you see this scv light?

P1653 SCV Circuit Malfunction
This could be caused by the oil control valve, low oil level, infrequent oil changes, a fault in the wiring to the valve or a bad PCM. What is odd is that the code is not listed in my information database.

That code is manufacturer-specific and not a part of the base (3-digit) OBD-II codes that are universal.
Toyota uses P1653 to indicate VSV For ACIS Circuit Malfunction
This is the control circuit for the intake air control valve.

P1653 P1653 - Power Steering Output Circuit Malfunction Problem with electrical steering rack

1az-fse engine p1653 scv fault .how to repair

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