IACV = Meltdown - G20.net

vsamoylov · Oct 29, 09, 11:13 AM

Well the famous p505 for the iacv code came up. Decided to find out what the issue was. Started taking it apart and couldn't get the plug off the iacv. Once I did get it off, it was clear to see that the pins inside the connector and the iacv melted together.
Here is a pic

So I bought a new iacv and replaced the connector. Put everything back together and the car started right up. However it had a high idle of 1500 rpm. Did the iacv relearn and nothing changed. So took everything apart and decided to diagnose the issue. The connector and the wiring was fine. The iacv was also fine. So decided to take a look at the ecu. Took it apart and found this.

It melted inside as well. The output resistor melted and it is the reason for the high idle.
Now the question comes to either replacing the ecu or solder a new resistor.

Just wanted to share....

Robj80 · Oct 29, 09, 11:15 AM

man this is too common for me in the nissan world.

polg20 · Oct 29, 09, 11:24 AM

damn, i heard of 00+ ECu going bad but never seen it, scary

bender-san · Oct 29, 09, 01:06 PM

This is extremely common in many Nissans (along with the electric engine mounts in the Maximas).

vsamoylov · Nov 02, 09, 01:25 PM

Never had any issues with maximas and I own 2 of them. The g20 has given me more problems and issues to diagnose and fix then the maximas.
Well I am now looking for an ecu now. Then have to tow the vehicle to get the key programmed to the new ecu. What A PITA.....

bender-san · Nov 03, 09, 01:27 AM

Quote:

Originally Posted by vsamoylov

Never had any issues with maximas and I own 2 of them.

Trust me...it's common. I've done dozens of ECM/IACV combo replacements.

**Krist** · Nov 03, 09, 01:46 AM

I have a couple ECUs if you need one.

http://www.g20.net/forum/showthread.php?t=85103

vsamoylov · Nov 03, 09, 08:34 AM

^^^ thanks. I need one from an 02 but auto

irishwrench · Nov 03, 09, 12:17 PM

Quote:

Originally Posted by vsamoylov

^^^ thanks. I need one from an 02 but auto

I have one. It was in my car before the 5speed swap with about 42K on it. Send me an offer. Don't forget it will require a key re-programm from the factory scan tool.

I need to buy a 5speed one since I just got the 505 code of death also. I have an 01 Maxima in my garage right now with a 505 code and the PCM is fried.

vsamoylov · Nov 03, 09, 12:29 PM

^^^ pm sent

vsamoylov · Nov 09, 09, 10:48 AM

Well bought a ecu from a member on g20.net. By the way thanks. Tomorrow i will take the car to a local nissan dealer and have them program the key to the ecu.

vsamoylov · Nov 10, 09, 08:17 AM

Well I took the car to the dealer last night. I drove it there with the bad ecu and then swapped the ecu. Dropped the car off and they programmed the keys this morning. Car started up fine but had a high idle. I didnt want to mess again with the re-learn for the idle so I had the dealership do it for me.

vsamoylov · Nov 10, 09, 06:36 PM

FUCK this iacv BS... that is all...

Nissan programmed the keys to the car. I wanted them to do an idle re-learn and they failed. They updated the ecu firmware but for some reason could not get the idle to be normal. So the idle is still at 1500 rpm and the car bogs and drives weird under 2k rpm....

bender-san · Nov 10, 09, 10:15 PM

Bogging under 2k sounds like more than an IAVL problem.

bigzitta · Nov 10, 09, 10:28 PM

I need an ECU for a 2002 auto trans g20 $100

vsamoylov · Nov 11, 09, 07:03 AM

Quote:

Originally Posted by bender-san

Bogging under 2k sounds like more than an IAVL problem.

I will look further into the issue when the weather gets better. But as of now the car has a pending p505 code and a stored p505 code. I looked at the FSM and the wiring diagram and the signal goes directly from the IACV to the ECU. So there is nothing in between. I already replaced the ecu because it melted and replaced the iacv ( used one might be bad ? ). I will re-check my wiring to make sure it is correct.

vsamoylov · Nov 15, 09, 10:44 PM

Well I fixed the idle. Now by looking at the tach, the idle is under 1k. Car starts up and idles fine when it's cold. Before it would hold idle at 1500rpm.

Now my next issue is it the fact the car seems to have a limiter between 1500rpm and 2k. I give it gas and rev it till that rpm and it keeps bouncing off till I give it more gas. When more gas is given, the car manages to rev Past it. Basically a hesitation.
Any ideas ? I swapped maf sensors and that did not fix the issue. I also swapped the tps and that did not fix the issue.
Now i am stumped...

bigzitta · Nov 18, 09, 01:14 PM

I am having same issues call me 561-302-7847

Chris · Nov 18, 09, 01:17 PM

wow that is just scary...

vsamoylov · Nov 18, 09, 02:49 PM

Quote:

Originally Posted by bigzitta

I am having same issues call me 561-302-7847

I got my issue figured out. I replaced the tps and then adjusted it per FSM and the car is back to normal now

Oct 29, 09, 11:13 AM	#1
vsamoylov G20 Senior Member Feedback: (2) (75%) Join Date: Aug 2006 Location: Harrisonburg VA Posts: 572 Vehicle: 2002 G20	IACV = Meltdown Well the famous p505 for the iacv code came up. Decided to find out what the issue was. Started taking it apart and couldn't get the plug off the iacv. Once I did get it off, it was clear to see that the pins inside the connector and the iacv melted together. Here is a pic So I bought a new iacv and replaced the connector. Put everything back together and the car started right up. However it had a high idle of 1500 rpm. Did the iacv relearn and nothing changed. So took everything apart and decided to diagnose the issue. The connector and the wiring was fine. The iacv was also fine. So decided to take a look at the ecu. Took it apart and found this. It melted inside as well. The output resistor melted and it is the reason for the high idle. Now the question comes to either replacing the ecu or solder a new resistor. Just wanted to share....

Oct 29, 09, 11:15 AM	#2
Robj80 AKA robkris8079 Feedback: (12) (100%) Join Date: Feb 2004 Location: meriden, CT Posts: 4,894 Vehicle: p10 & C11 yes C	man this is too common for me in the nissan world. __________________ WTB p11 automatic in need of mechanical love, let me know what you got

Oct 29, 09, 11:24 AM	#3
polg20 G20 Guru Feedback: (9) (100%) Join Date: May 2007 Location: Arizona Posts: 1,009 Vehicle: RR pawah	damn, i heard of 00+ ECu going bad but never seen it, scary __________________ There are no weapons of mass destruction in Iraq, Chuck Norris lives in Oklahoma.

Nov 03, 09, 01:46 AM	#7
Krist Sponsored by BevMo! Feedback: (9) (100%) Join Date: Jun 2006 Location: Orange County Posts: 1,858 Vehicle: SRG20VE	I have a couple ECUs if you need one. http://www.g20.net/forum/showthread.php?t=85103 __________________ We be clubbin'... Brembo Club .............................. NeoVVL Club .............................. 5port Club .............................. Remus Club

Nov 15, 09, 10:44 PM	#17
vsamoylov G20 Senior Member Feedback: (2) (75%) Join Date: Aug 2006 Location: Harrisonburg VA Posts: 572 Vehicle: 2002 G20	Well I fixed the idle. Now by looking at the tach, the idle is under 1k. Car starts up and idles fine when it's cold. Before it would hold idle at 1500rpm. Now my next issue is it the fact the car seems to have a limiter between 1500rpm and 2k. I give it gas and rev it till that rpm and it keeps bouncing off till I give it more gas. When more gas is given, the car manages to rev Past it. Basically a hesitation. Any ideas ? I swapped maf sensors and that did not fix the issue. I also swapped the tps and that did not fix the issue. Now i am stumped... Last edited by vsamoylov; Nov 16, 09 at 08:09 AM.

Oct 29, 09, 01:06 PM	#4
bender-san G20 Member Feedback: (0) (0%) Join Date: Aug 2009 Location: Beaverton, OR Posts: 103 Vehicle: 1995 G20t	This is extremely common in many Nissans (along with the electric engine mounts in the Maximas).

Nov 02, 09, 01:25 PM	#5
vsamoylov G20 Senior Member Feedback: (2) (75%) Join Date: Aug 2006 Location: Harrisonburg VA Posts: 572 Vehicle: 2002 G20	Never had any issues with maximas and I own 2 of them. The g20 has given me more problems and issues to diagnose and fix then the maximas. Well I am now looking for an ecu now. Then have to tow the vehicle to get the key programmed to the new ecu. What A PITA.....

Nov 03, 09, 08:34 AM	#8
vsamoylov G20 Senior Member Feedback: (2) (75%) Join Date: Aug 2006 Location: Harrisonburg VA Posts: 572 Vehicle: 2002 G20	^^^ thanks. I need one from an 02 but auto

Nov 03, 09, 12:29 PM	#10
vsamoylov G20 Senior Member Feedback: (2) (75%) Join Date: Aug 2006 Location: Harrisonburg VA Posts: 572 Vehicle: 2002 G20	^^^ pm sent

Nov 09, 09, 10:48 AM	#11
vsamoylov G20 Senior Member Feedback: (2) (75%) Join Date: Aug 2006 Location: Harrisonburg VA Posts: 572 Vehicle: 2002 G20	Well bought a ecu from a member on g20.net. By the way thanks. Tomorrow i will take the car to a local nissan dealer and have them program the key to the ecu.

Nov 10, 09, 08:17 AM	#12
vsamoylov G20 Senior Member Feedback: (2) (75%) Join Date: Aug 2006 Location: Harrisonburg VA Posts: 572 Vehicle: 2002 G20	Well I took the car to the dealer last night. I drove it there with the bad ecu and then swapped the ecu. Dropped the car off and they programmed the keys this morning. Car started up fine but had a high idle. I didnt want to mess again with the re-learn for the idle so I had the dealership do it for me.

Nov 10, 09, 06:36 PM	#13
vsamoylov G20 Senior Member Feedback: (2) (75%) Join Date: Aug 2006 Location: Harrisonburg VA Posts: 572 Vehicle: 2002 G20	FUCK this iacv BS... that is all... Nissan programmed the keys to the car. I wanted them to do an idle re-learn and they failed. They updated the ecu firmware but for some reason could not get the idle to be normal. So the idle is still at 1500 rpm and the car bogs and drives weird under 2k rpm....

Nov 10, 09, 10:15 PM	#14
bender-san G20 Member Feedback: (0) (0%) Join Date: Aug 2009 Location: Beaverton, OR Posts: 103 Vehicle: 1995 G20t	Bogging under 2k sounds like more than an IAVL problem.

Nov 10, 09, 10:28 PM	#15
bigzitta G20 Newbie Feedback: (0) (0%) Join Date: Dec 2008 Location: florida Posts: 2 Vehicle: 2002 g20	I need an ECU for a 2002 auto trans g20 $100

Nov 18, 09, 01:14 PM	#18
bigzitta G20 Newbie Feedback: (0) (0%) Join Date: Dec 2008 Location: florida Posts: 2 Vehicle: 2002 g20	I am having same issues call me 561-302-7847

Nov 18, 09, 01:17 PM	#19
Chris Laid off 10/14/08 Feedback: (60) (100%) Join Date: Mar 2002 Location: Mt. Prospect,IL Posts: 10,043 Vehicle: POS 95 g20t MT	wow that is just scary...

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode