adupyours wrote:


No thank you for posting your results!

--

Steve

http://www.atlantaracing.com

Wiikinki wrote:


It's reading the temp of the EGR flow, not the coolant, DUH!

--

Steve

http://www.atlantaracing.com

EGRC exhaust recirc systems havent changed: there exists no such substance as "EGR" or "EGR flow".

For greenpee reasons, EGRC recirculates exhaust gases to intake. ECU controlled recirc is based on EGRC Coolant Temp sensor, rpm, engine load... Nissan doesnt measure exhaust temp, never, none on EGRC... The actual exhaust flow valve is controlled with pneumatic valve from ECU output signal.

Both coolant temp sensors seen in VGE below; Engine & EGRC.

http://memimage.cardomain.net/member...748507_230.jpg


Edit: Please read more EGRC -info from 1996 Nissan Field Service Manual, page EC-298. There this coolant EGR Temp sensor is tested via setting it in a boiling water kettle. For this, flollow link below, check 'Favorite Links'.


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Wiikinki
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Theres 'nothin' wrong in throwing parts on equipment one is not familiar, its still 100x cheaper than throwin the problem to stealership. My guess is that after throwing in 1000$ you'd be still be there, still have the very same problem...

Best 'joke' I heard from a local cosworth-shop: shop has been 'repairing' it for a year, 10.000$ bills, not (!?) yet ready...

Batterly leak: Sandpaper clean poles & surrounding plastic, seal around with silicone. Grease poles with contact grease. Leaks will be bad memories...
Overcharging causes boiling, acid spill

"dealership should understand": Stealer$hips do understand - bill$, no shame, quick profit. Information is money. Arrange schemes to lure in more. Charge for plugs not changed, go buy 'em cheap at e-bay...

Clean plugs & coilpacks, check plug gaps. In hi-voltage leak isolation, 'anything goes': I'd test self vulganizing rubbertape, maybe wrap around teflon sheet. Isolating lacquer/paint on the alu intake? I guess theres not much room.
Harmful: their job is to produce the spark. Sparks jump always to groung via easiest route. When it jumps 'out', long periods will 'carbonize' this wrong route. It may be possible to clean/scrape that off. After clean, Hi voltage isolation lacquer might help ...it does in distr caps.


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Wiikinki
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Wiikinki,

The EGR temp sensor on 95-99 Nissan Maximas (and probably on 2000+
model years) detects exhaust gas flow and temperature. It never comes
into contact with coolant, although as Adam mentioned, there is a
coolant bypass through the plenum that runs within a few inches of the
EGR temp sensor, but never comes into contact with it.

The ECU may use the coolant temp sensor (ECTS) readings as part of it's
algorithm in controlling the EGR valve, but that is in addition to the
readings from the EGR temp/flow sensor.

See here:
http://img226.imageshack.us/my.php?i...wsensor1wg.jpg

Also look at EC-256 in the Nissan Maxima FSM and the diagnosis for DTC
P1401 for more info.

Cheers,
Nirav

Wiikini:

I do not have this specific "Field Manual", but a cheap Haynes manual
and my own eyes have come to the conclusion you are talking about a
different engine, maybee previous 3rd gen engine. I looked at the
single cam engines in my '93-'01 Haynes Manual, but could not see a
good picture of the coolant ports, but there were two very different
motors. The biggest visual cue identifying them is the intake. One has
two ports, coming from front of the car around to both sides of the
engine. My upper intake or plenum is 1 solid casting, has 6 long ports
reaching from the rear of the motor over the valve cover and bolting
into the lower intake. My suggestion to you is go pop a hood on a 96
Maxima (DOHC, 3.0 V6 3000) and take a look for yourself.

In the picture you posted,

http://memimage.cardomain.net/member...748507_230.jpg

this could very well be where it is located on your car. However, the
coolant distribition ports look nothing like my 96 Maxima. There is no
"Y" for two large hoses, and no two sensors mount opposite each other
like pictured.

The picture Nirav posted:

http://img226.imageshack.us/my.php?i...wsensor1wg.jpg

Is a clear example of the EGR Temp sensor, which measures EGR flow by
warming the sensor when flow is present. When flow is present, the
sensor gets hot, reducing voltage and increasing resistance. As it
cools or flow stops, the opposite applies. Resistance can range from
10 MEG Ohms to less than 1K Ohms. Voltage supplied to the sensor is
12V, but backprobing voltage with engine running ranges anywhere from <
4.000 to < 0.1 volts. Obviously, only voltage can be read while the
engine is running. And, it NEVER comes into contact with coolant.

Regards, -Adam

I did thank you, I have to correct my input. Seems to be 'both' ways (exhaust temp non existant in VGE):

- Good pic thks

- I dont know where you get the page EC-256. In 1996 FSM that page tells about A/T. Maybe another year model manual...?

- 1996 Manual, FSM page EC-298 Describes Coolant EGRC temp sensor (DTC0305); this is direct input for EGRC circuit ctrl.

- 1996 Manual, FSM page EC-295 Describes EGRC exhaust gas passageway temp sensor (DTCP1401).
There FSM says this among other things:
This sensor is NOT directly USED to control the engine system. It is used only for the onboard diagnostics.


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