hi,

does this vehicle have the EGR valve? If yes, can you tell me where
it can be found, and if there is a diagram available on the internet
showing its location?

I am getting the P1130 and P1135 check engine codes and this points
back to EGR and possibly the EGR vacuum modulator<<?. So any advice
would be very much appreciated.

Thanks in advance.
TOm

"Fish" <fishingrod45@hotmail.com> wrote in message
news:2s5rg2tlc7ir64kv18314brfofvtnttlgg@4ax.com...


EGR codes are P0401 through P0408. Are you sure of the codes?

The EGR is usually mounted near the intake manifold with a tube leading to
the exhaust manifold. It will have a couple or 3 vacuum hoses, looks like a
flying saucer.

You can check EGR operation by applying vacuum to the EGR while the engine
is operating. The engine should run roughly and almost die.

You can get access to online factory service manuals at techinfo.toyota.com
for $10/day.
--

Ray O
(correct punctuation to reply)

Ray O,

Thanks, Yes I am sure of the codes, not so sure of the EGR valve...

I think I need to replace the AF sensor in Bank 1 rear, in front of
catalyst. Is this an accurate interpretation of the codes P1130,
P1135?

Thanks,
Tom



Ray O Wrote:


--
TBURK
------------------------------------------------------------------------
TBURK's Profile: http://www.toyotanation.com/forum/m...hp?userid=68075
View this thread: http://www.toyotanation.com/forum/s...ad.php?t=156057

"TBURK" <TBURK.2ec2dm@no-mx.forums.yourdomain.com.au> wrote in message
news:TBURK.2ec2dm@no-mx.forums.yourdomain.com.au...

The reason I asked whether you were sure of the codes is that they are not
standard OBD II diagnostic trouble codes and are probably proprietary codes
for Lexus. I do not have ready access to proprietary codes, although they
will most likely be listed in the factory service manual, along with
detailed diagnosis procedures.

Your best bet is to look at the factory service manual for a correct
interpretation of the codes.

Sorry I couldn't be of more help.

--

Ray O
(correct punctuation to reply)

Ray,

Thanks you were a help. I have been given this advice, and I think it
is good. Do you agree?

Replace bank 1 sensor 1 (rear head,sensor before cat) AF sensor.

Thank you,
Tom




On Mon, 18 Sep 2006 10:37:09 -0500, "Ray O"
<rokigawaATtristarassociatesDOTcom> wrote:

"Fish" <fishingrod45@hotmail.com> wrote in message
news:s73ug25h15ct2geruqd1n4ikit6qkmvhtl@4ax.com...

Tom,

Note that the Air Flow sensor is not the same thing as the O2 sensor.

The air flow sensor, sometimes referred to as a MAF (manifold air flow) or
MAP (manifold absulute pressure), measures the amount of air entering the
intake manifold. The air flow sensor, along with the O2 sensor, throttle
position sensor, RPM sensor, coolant temperature sensor, tell the computer
how long to keep the injectors open.

The O2 sensor is in the exhaust stream and tells the computer if the
air/fuel mixture is too rich or too lean and then the computer adjusts
injector pulse duration to achieve the proper air/fuel mixture.

There is only one air flow sensor and there is no reference to Bank 1 or
Bank 2. There is a before cat and after cat O2 sensor for each cylinder
bank. Bank 1 is the side closest to the passenger compartment in your
vehicle.

I generally recommend checking the signal from an O2 sensor before replacing
it, although when a trouble code points to a particular O2 sensor, the
sensor is generally bad.

Since I am not familiar with the trouble codes you posted, I can only assume
that what you posted is correct and chances are (~90%), replacing the O2
sensor will cure the problem.
--

Ray O
(correct punctuation to reply)

Ray,

I think the cylinders in this vehicle run front to back rather than
side to side.

I think i catch what you are saying though.

Thank you,
Tom


On Tue, 19 Sep 2006 00:11:54 -0500, "Ray O"
<rokigawaATtristarassociatesDOTcom> wrote:

There is only one air flow sensor and there is no reference to Bank 1
or Bank 2. There is a before cat and after cat O2 sensor for each
cylinder bank. Bank 1 is the side closest to the passenger
compartment in your vehicle.

"Fish" <fishingrod45@hotmail.com> wrote in message
news:cpn3h2tg8prmv2k760p4c5sva7fnciu4pi@4ax.com...
Hmmm.....

I believe that RX has a transverse-mounted (sideways) engine and transaxle,
as opposed to a longitudinally mounted drivetrain.


--

Ray O
(correct punctuation to reply)