apparently the code indicates a problem with the "EGR System Hi/Low Flow"

should i take this problem to the dealer? i searched and i found some threads regarding throttle body cleaning, and cleaning the EGR valve? so is this something I can do.

BTW i have a 99 Max

thanks

 

DTC 0302

Diagnostic Trouble Code 0302 points to a problem with the Exhaust Gas Recirculation system.

The malfunction isdetected by the Engine Control Module when no EGR flow is detected under conditions which call for EGR.




Possible causes include:
- The electrical harness or connectors (valve circuit open or shorted)
- The EGR valve is stuck closed
- Weak or dead battery
- The EGR passage is clogged
- Faulty EGR temperature sensor circuit
- A leak somewhere in the exhaust system

The EGR Volume Control Valve may be tested with an ohmmeter. Disconnect the electrical connector. Looking at
the connector half which is attached to the EGRVCV with the latch at the 12 o'clock position you will see two
rows of three terminals. The top row is numbered 1-3, right to left. The bottom row is numbered 4-6, right to
left. Measure the resistance between these terminal pairs:
2 1
2 3
5 4
5 6
... all resistance values should be 20.9-23.1 ohms at 68 degrees F.

Reconnect the EGRVCV connector halves. Turn the ignition switch ON OFF repeatedly. Verify that the EGRVCV
shaft moves smoothly forward backward according to the ignition switch position.

The Exhaust Gas Temperature Sensor may be tested with an ohmmeter. The specifications are ...
- at 32 degrees F, 0.68-1.11 Megohms
- at 122 degrees F, 0.09-0.12 Megohms
- at 212 degrees F, 0.017-0.024 Megohms

 

okay i have 49,000 miles on my car, so i don't think anything's clogged. i replced my battery last year i believe, b/c my stock one went dead.

does anyone have a pic of this EGR valve? i have no idea how it looks like.

and would this problem be covered under the 60,000 mile powertrain warranty.

thanks again

 

I wish I new more than I do, I just have some of the DTC code definitions. I believe that you might be able to clean the EGR valve be doing a good cleaning of your TB.

 

anyone else?

 

It should be covered.

 

You got a very good response. Did you perform these tests? If you don't have a FSM, go buy one. It's a worthwhile investment.


Since it's exhaust related, a dealer should take care of it. I would play ignorant and just say "the light is on" and see what the bozos at the dealer tell you it is. If it's something other than what you know, come back and we'll continue to help. A competent (oxymoron for Nissan) dealer should be able to fix this easily.

 

Not covered. EGR & emmisions components (exclud. cat and ECU) for Fed spec are 3yr/36k mi per Nissan Warranty booklet.

 

That's sad. I didn't realize that was an exclusion......



New advice: AVOID the dealer.

 

Dammit. the dealer wanted $40 just to pull the codes, so i now they are going to overcharge on repairs.

i might just clean out my throttle body and see if that helps. i would like to perform tests on the EGR, but the problem is i don't even know what it looks like.

i guess i'll try search again.

 

Reset your ECU and see if the error codes reappear. Personally, I wouldn't bring my car on the first occurance of an error code. With less than 50K, it could just be a glitch.

FWIW, AAA magazine this month indicated that over-filling the gas tank can cause EGR and vapor recovery error codes. If you are in the habit of topping off your gas tank when you fill up, discontinue the practice and see if the problem goes away.

 

i never over-fill, but i will reset the ECU tonight and croos my fingers.

thanks for the help guys

 

seven,

I did some more digging to see if Daniel B. mentioned the actual location of the EGRVCV and found this post:

http://forums.maxima.org/showthread....ghlight=EGRVCV

Daniel goes into a little more detail on its location.......



And please continue to avoid the dealer like the plague.

 

It should actually be po302 which would indicate a engine misfire on cylinder #3. The ecu would have to see a set # of misfires in order to set this code. It is generally due to a failure of a injector and or a igntion coil/spark plug. I could be wrong, I once thought I was but I was mistaken.
l8tr -- SS

 

Seven,

You might want to follow this link to define your next code depending on whether you've pulled it by scan tool or read it off the SES light. Good luck.

http://www.batauto.com/nissan.html

 

i read the codes off the SES light. i reset the ECU yesterday, so far the light has not come back on.

my car runs fine, in fact it seems smoother now that i reset the ECU.

my gas mileage is also fine (24 mpg), i think it was just an ECU error.

 

My wife fills the tank w/Regular, I fill it with Premium (I30). I'm beginning to wonder if that has something to do with the code.???

We have about 70K miles on the Infiniti.