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Have a 2000 xterra with a code of p0325. also the SES light

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flashes. it had code 328...
have a 2000 xterra with a code of p0325. also the SES light flashes. it had code 328 too, but has since stopped showing that one. I replaced and relocated the KS, but the code comes back in seconds.
Submitted: 1 year ago.Category: Nissan
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Answered in 12 minutes by:
1/1/2016
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago
camerontech
camerontech, Auto Mechanic
Category: Nissan
Satisfied Customers: 565
Experience: diagnostic auto tech
Verified

hi there,

im cam, a licenced diagnostic tech.

2 things are coming to mind on your issue.

1 . wiring from pcm to the sensor connector.

if there is corrossion or a open wire, this will store and a code immidiatley. you will need to to a continuity check from sensor connector to the pcm.

2. distributor.

i have seen bad bushings and bearings in the distributor on these and the knock will pick up the noise.

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Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

Tests/Procedures:1. Use a regular Digital Volt Ohm Meter (DVOM) and check for the 5.0 volts to the knock sensor with the knock sensor unplugged and key on.

2. If the 5.0 volts is present, reconnect the knock sensor and backprobe and check the knock sensor voltage. Should read approximately 2.5 volts plugged in and backprobing

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Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

also...

generally when the ses light is flashing, this is a warning that cat damage is possible.

is it running ok?

a lean running condition or misfire will set the ks code.

this could be cause from tune up condition to a mass airflow sensor causing a lean condition . fuel trims will need to be checked to determine a lean misfire

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Customer reply replied 1 year ago
The engine (147,000) has what sounds like rocker chatter and could even be from the distributor. during driving if you hard accelerate it sounds like the engine is misfiring and overall seems to be low on power.
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

ok.

have a good look at the distributer.

i think this is the area that we should be focusing as this will cause a misfire and your lack of power.

to check the mass airflow sensor, you will need a scanner to monitor airflow and the fuel trims. they should be "0" plus or minus 2.

g/s should be about 4 to 6 and wide open be plus 60 to 80

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Customer reply replied 1 year ago
I checked the MAF Flow and the reading are 0.42 key on, and 5.92 engine at idle. I'm not sure what gs is, so I couldn't check that.
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

thats grams per second

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Customer reply replied 1 year ago
well we're over my head. I have no idea how to check that. I'm at a loss at this point. I replaced the distributor last year, it might have 5000 miles on it, but I could do it again and see what happens.
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

is the distributer under warranty possibly?

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Customer reply replied 1 year ago
it is. Would it be easier to call me and I give you readings from the scanner as it's running or do we think it's running lean due to the distributor?
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

sure,

i can call no problem.

most other techs on this site charge for this. I dont, all that i ask is a postive rating wether you figure it out or not.

i am available for a call in a couple of hours as im not by a phone right now.

1 thing to check before that is fuel trim.

can you see the trims?

there should be lt for long term and st for short term

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Customer reply replied 1 year ago
lt is 2.3 and st is -3.4 to -4.9 at idle
Customer reply replied 1 year ago
st is now running from -4.9 to -7.7 with engine at normal temp lt is still 2.3
Customer reply replied 1 year ago
MAF flow GR/SE 5.07 at idle
Customer reply replied 1 year ago
st firm 2 is 0.8 to 2.2 and lt firm 2 is 10.4
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

ok,

if you hold full throttle snaps, can you capture maf rate and ft?, might have to do it a couple times to capture

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Customer reply replied 1 year ago
with engine running?
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

yes, sorry

justa couple full throttle snaps while monitoring those items

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Customer reply replied 1 year ago
MAF appears to jump between 15 and 19. it's different each time. lt ftrm 1 jumps to 9.3 and st ftrm1 from 0.0 to 2.3
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

ok.

those reading are a little low for the maf. its about a 1/3 of what it should be.

so..

its either the scanner itself is just not quick enough to catch the reading , the mass airflow sensor is faulty or the cat could be plugged .

i think we should focus on the distributer and if that noise is coming from is or not.

if you suspect it is than while its still under warranty , replace it to eliminate it as the source of the problem.

the idle fuel trims arent too bad, but full throttle trims should jumo to "99" on the short term. so it still could be a distributer problem or the mass airflow sensor

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Customer reply replied 1 year ago
the scanner has a lt and st ftrm1, lt and st ftrm 2, 11, 21. is there a particular one I should be reading?
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

those are bank 1 and bank 2.

1 and 2 should always be relativley equal on both st and long term.

"0" i a perfect fuel mixture

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Customer reply replied 1 year ago
I checked the MAF sensor with a volt meter and the voltage appears to be good. .3v with key on, 1.3v at idle and 2.4v to 3.4v above idle
Customer reply replied 1 year ago
my p0300 code is back in addition to the p0325 I started with and the SES light is on solid
Customer reply replied 1 year ago
Ok, I'm going to go back inside till I come up with something else to check
Customer reply replied 1 year ago
I can't wait any more today, it's getting late. bye
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago
Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 20,646
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
Verified

Hello my name is ***** ***** thank you for your Question.

Cameron Brookhouse has opt'd out cause he feels he can no longer help you. So I will be taking over this question.

What brand spark plugs do you have in the truck? Also how did you relocate the knock sensor? I have seen this done and work and not work. The key thing is the shielded wire. If that is not wired properly you can continue to get knock sensor codes also. But then again, if you are getting P0300 that can cause the knock sensor code also.

Let me know..

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Customer reply replied 1 year ago
I have autolight double platinum plugs in the vehicle that I put in a few months before it started running bad. I had an issue with the distributor at that time so I replaced it and did a tuned up. I replaced the distributor again today and plug wires yesterday with no difference. I have replaced the KS with a 95 maxima sensor and harness, then relocated it to the top of the intake and still get the same code. Currently I have still have code P0325 however the issue appears to be related to the flashing SES light which eventually may trigger a p0300 multiple misfire. While driving the vehicle it feels low on power, sounds like it backfires in the intake with acceleration to get up to speed and the SES light flashes.
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

Do you recall what brand plugs were in this engine before you changed the plugs?

The reason is cause these engines are very sensitive to the spark plugs used. These engines only like NGK spark plugs. When any other spark plug is used, you can get misfire codes. Of course if you have a misfire issue, it can produce a knock sensor code.

Also, the distributor you installed, did you get it after market?

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Customer reply replied 1 year ago
Both distributors were aftermarket. It was still under warranty. As for the plugs, I don't remember the brand. I'll be happy to try NGK.
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

You may need to get a Dealer Distributor also. I have had After Market ones not work a number of times brand new out of the box.

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Customer reply replied 1 year ago
Is there a way to know for sure?
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

You need a Oscilloscope to monitor the signal from the distributor to know for sure.

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Customer reply replied 1 year ago
I must have left that in my other tool box. I'll see what the price is, but I'm guessing first born. Maybe I can get lucky at the junk yard.
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

I would perfer a used Distributor that is OEM verses after market.

So yeah, give that a try.

Let me know how you make out.

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Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

A Oscilloscope is expensive. It would be cheaper to have a shop that has one check the signal for you.

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Customer reply replied 1 year ago
I seem to remember them from 30 years ago. I'll see what I can do and let you know.
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

You got it!

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