Let's diagnose the High Pitched Noise

jpit · 11-24-2009, 03:12 PM

With the number of people on this board and some with great expertise we should be able to pinpoint what is causing the high pitched noise problem. I believe that there are two separate problems and that is creating some confusion. The high pitched noise I hear is definitely not coming from the ecu. It is coming from under the hood at the rear of the engine. It is around
10 kh and is accompanied by what sounds like static (like a cheap 1" speaker being over driven). For those who have this noise, please turn on the ignition
(engine not running) and put the transmission in any gear (out of neutral) and have the hood up. You can clearly hear the noise and it abruptly stops when you put the transmission into neutral. It wll start up again as soon as you start to put the shifter into gear. I think it is some type of relay problem.
Anybody know if there is a relay in that location?

getmecoffee · 11-24-2009, 04:07 PM

Does replacing the ECU fix the high pitching noise? Has anyone confirmed that?

VCuomo · 11-24-2009, 05:01 PM

Why don't you just let Nissan finish their investigation? They have admitted that there is a problem and that they are working on a solution.

vipor · 11-24-2009, 05:16 PM

let it die....

no need to diagnose, just call nissan and push for a tsb

jpit · 11-24-2009, 07:17 PM

That approach is really working well. The problem I have with some others has nothing to do with the ecu (presently being investigated). It is a single part located somewhere at the back of the engine that is causing the noise. If you don't want to help fine maybe someone else as an idea.

Silver37 · 11-24-2009, 07:49 PM

I'll try this on my G37 tomorrow and let you know what I hear. I've always suspected it wasn't just the ECU since I could hear the noise from the outside near the cowling.

Have you identified what the part is?

jpit · 11-24-2009, 08:01 PM

No, but it is at the back of the engine toward the passenger side. I took off the engine cover but didn't see anything specific.

cab83_750 · 11-24-2009, 08:10 PM

Hmmmm! For those with the noise, are they all with SRM? Or is the issue global? I am just curious as per your description, you need the car in gear.

I admire your pursuit. If I had it, I probAbly would not be waiting for Nissan.

jpit · 11-24-2009, 08:16 PM

It is interesting that as soon as you put it in neutral the noise stops (engine doesn't have to be running). Push the gear shift slightly toward any gear and it starts up again. That should provide a clue as to what is causing it.

cab83_750 · 11-24-2009, 08:18 PM

So do you have the SRM?

GTRFAN · 11-24-2009, 08:36 PM

Quote:

Originally Posted by jpit

No, but it is at the back of the engine toward the passenger side. I took off the engine cover but didn't see anything specific.

When you say the passenger side, you mean the right hand side of the car, yeah? The reason I ask is all of us with right hand drive versions (Jap, Aus, UK, etc) don't have the issue as far as I know. This may help to isolate the issue to just the American models.

jpit · 11-24-2009, 08:43 PM

I have the rev match and it doesn't have any effect on the noise.

kenchan · 11-24-2009, 09:17 PM

Does this happen on any of the AT's?

cab83_750 · 11-24-2009, 09:26 PM

Quote:

Originally Posted by jpit

I have the rev match and it doesn't have any effect on the noise.

Anyone else with srm with the noise? Better yet, does anyone have a non-SRM car with the noise?

TheWeatherman · 11-24-2009, 10:12 PM

This is a common issue on G37's auto or manual, and also the EX35's. It doesn't have to do with the transmission.

11-24-2009, 03:12 PM	#1 (permalink)
jpit Enthusiast Member Join Date: Feb 2009 Location: Washington State Posts: 440 Drives: 370Z Tour MT w/Spt Rep Power: 16	Let's diagnose the High Pitched Noise With the number of people on this board and some with great expertise we should be able to pinpoint what is causing the high pitched noise problem. I believe that there are two separate problems and that is creating some confusion. The high pitched noise I hear is definitely not coming from the ecu. It is coming from under the hood at the rear of the engine. It is around 10 kh and is accompanied by what sounds like static (like a cheap 1" speaker being over driven). For those who have this noise, please turn on the ignition (engine not running) and put the transmission in any gear (out of neutral) and have the hood up. You can clearly hear the noise and it abruptly stops when you put the transmission into neutral. It wll start up again as soon as you start to put the shifter into gear. I think it is some type of relay problem. Anybody know if there is a relay in that location?

11-24-2009, 05:16 PM	#4 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 42 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 49	let it die.... no need to diagnose, just call nissan and push for a tsb __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

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11-24-2009, 04:07 PM	#2 (permalink)
getmecoffee Base Member Join Date: Nov 2009 Location: NY Posts: 52 Drives: Nissan 370Z Rep Power: 16	Does replacing the ECU fix the high pitching noise? Has anyone confirmed that?

11-24-2009, 05:01 PM	#3 (permalink)
VCuomo Track Member Join Date: May 2009 Location: SoCal Posts: 887 Drives: BMW 335i Sport Rep Power: 17	Why don't you just let Nissan finish their investigation? They have admitted that there is a problem and that they are working on a solution.

11-24-2009, 07:17 PM	#5 (permalink)
jpit Enthusiast Member Join Date: Feb 2009 Location: Washington State Posts: 440 Drives: 370Z Tour MT w/Spt Rep Power: 16	That approach is really working well. The problem I have with some others has nothing to do with the ecu (presently being investigated). It is a single part located somewhere at the back of the engine that is causing the noise. If you don't want to help fine maybe someone else as an idea.

11-24-2009, 07:49 PM	#6 (permalink)
Silver37 Base Member Join Date: Nov 2009 Location: US Posts: 21 Drives: G37S, Nissan Maxima Rep Power: 16	I'll try this on my G37 tomorrow and let you know what I hear. I've always suspected it wasn't just the ECU since I could hear the noise from the outside near the cowling. Have you identified what the part is?

11-24-2009, 08:01 PM	#7 (permalink)
jpit Enthusiast Member Join Date: Feb 2009 Location: Washington State Posts: 440 Drives: 370Z Tour MT w/Spt Rep Power: 16	No, but it is at the back of the engine toward the passenger side. I took off the engine cover but didn't see anything specific.

11-24-2009, 08:10 PM	#8 (permalink)
cab83_750 Track Member Join Date: Apr 2009 Location: CA Posts: 887 Drives: 09 NISSAN 370Z Rep Power: 417	Hmmmm! For those with the noise, are they all with SRM? Or is the issue global? I am just curious as per your description, you need the car in gear. I admire your pursuit. If I had it, I probAbly would not be waiting for Nissan.

11-24-2009, 08:16 PM	#9 (permalink)
jpit Enthusiast Member Join Date: Feb 2009 Location: Washington State Posts: 440 Drives: 370Z Tour MT w/Spt Rep Power: 16	It is interesting that as soon as you put it in neutral the noise stops (engine doesn't have to be running). Push the gear shift slightly toward any gear and it starts up again. That should provide a clue as to what is causing it.

11-24-2009, 08:18 PM	#10 (permalink)
cab83_750 Track Member Join Date: Apr 2009 Location: CA Posts: 887 Drives: 09 NISSAN 370Z Rep Power: 417	So do you have the SRM?

11-24-2009, 08:43 PM	#12 (permalink)
jpit Enthusiast Member Join Date: Feb 2009 Location: Washington State Posts: 440 Drives: 370Z Tour MT w/Spt Rep Power: 16	I have the rev match and it doesn't have any effect on the noise.

11-24-2009, 09:17 PM	#13 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	Does this happen on any of the AT's?

11-24-2009, 10:12 PM	#15 (permalink)
TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 16	This is a common issue on G37's auto or manual, and also the EX35's. It doesn't have to do with the transmission.