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after replaced IACV and ECM still get code P0505 Forums > > after replaced IACV and ECM still get code P0505 after replaced IACV and ECM still get code P0505
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  #16  
Old 03-14-2009, 11:39 PM
cominstraightatcha
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another thing......if i wanted to go ahead and replace my o2 sensor myself what kind would i need to buy???
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  #17  
Old 03-15-2009, 04:34 AM
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Quote:
Originally Posted by cominstraightatcha View Post
another thing......if i wanted to go ahead and replace my o2 sensor myself what kind would i need to buy???
Buy sensors that have a direct plug. DO NOT buy the ones that you have to splice in.
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  #18  
Old 03-16-2009, 02:10 PM
cominstraightatcha
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just wanna make sure i purchase the right sensors....for the p0138 and p0139 thats bank 1 sensor2 and p0158 and p0159 is bank2 sensor 2...is that right and where would they be located???
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  #19  
Old 03-16-2009, 04:55 PM
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Quote:
just wanna make sure i purchase the right sensors....for the p0138 and p0139 thats bank 1 sensor2 and p0158 and p0159 is bank2 sensor 2...is that right and where would they be located???
You can find the information about the codes here: Nissan OBDII Code Chart P0000-P0175


And the sensors location are here: 1999-2001 Nissan Maxima O2 Sensor Identification
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  #20  
Old 03-19-2009, 04:51 PM
cominstraightatcha
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with my p0745 codes what would u suggest about handling that.... do u think the tranny needs rebuilt??
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  #21  
Old 05-19-2009, 06:28 PM
Lanaue Lanaue is offline
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How does the motor mounts affect the ivac ?
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  #22  
Old 05-20-2009, 08:04 AM
streamcast streamcast is offline
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First did the idle relearn fix your P0505? I would fix the idle issue first because if the idle is staying high it will cause the transmission to shift not so good. Let us know.
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  #23  
Old 07-27-2009, 01:46 PM
hot_mignacio
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I'm having the same code P0505 and my mechanic told me to replace ECU and Idle control module. I already replaced the idle control module twice and MAP sensor. I was also told because of the code P0505 he is unable to perform Idle relearn. Can anyone confirm that Idle relearn won;t work with the code?
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  #24  
Old 07-27-2009, 03:41 PM
streamcast streamcast is offline
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What was the procedure in your replacement. You have to replace both the IAC and the ECU at the same time and then performed the Idle relearn.
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  #25  
Old 07-27-2009, 09:06 PM
jh15 jh15 is offline
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to all above, i am tired, but need to post to save grief to others i wanted to post in maxima org but not able, so i came here, think i even pay here so i can post.
I have lots to say on iacv, learning etc.
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  #26  
Old 07-27-2009, 09:12 PM
jh15 jh15 is offline
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these forums saved me a couple grand.
my end result was replacing IACV and a chip in my car computer
The chip was 10.00 or so the valve 270.00
I am an engineer in aerospace and determined not to go to stealership. They made me wait three weeks to get little hoses i thought i'd renew.
Throw money at this forum it saved me 2k
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  #27  
Old 07-27-2009, 09:38 PM
jh15 jh15 is offline
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You need to replace burnt chip in ecu
if you have a friend good in electronics, or look around for a ham radio operaor, he can replace driver chip.
I assume you measured pins on IACV and see short
If you get a computeroff ebay or dealer, you have to have car towed to stealership to re program key code.
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  #28  
Old 07-27-2009, 09:45 PM
jh15 jh15 is offline
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the relearn is easy, you warm up the car, then unplug the brown upper plug on the throttlebody for less than 5 seconds then reconnect most of the relearn stuff is obvious, make sure no loads on the idling engine, i.e. no a/c/ defogger rear windshield, no high end stereo on etc.

Last edited by jh15; 07-27-2009 at 09:47 PM.
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  #29  
Old 07-27-2009, 10:00 PM
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Motor mounts I just discovered may not have wrecked my ecu. In some other forum I mentioned buzz under hood was my ABS unloading due to a fault in rear wheel sensor. so i lived with it.
I then mistakenly, after my IACV failed thought it was a motor mount.
Since, I have replaced IACV, repaired the ECU in my shop here in Maine, unplugged the motor mounts, and got same buzz on key turn on. So my mounts may be fine. I will 1. current protect my mounts and use Littlefuse PTC fuses in the lines.
Post oscilloscope waveforms at the sta509 pins to see why chip runs so warm.
I think I am not supposed to say commercial things, but i have esd protected and mil-spec soldering experience. waveforms soon to follow, plus I will find if all is well with loads on ic and it is hot, i will heatsink it. Hey it lasted 8 years, so don't blame nissan, blame the stepper motor in the IACV co.
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  #30  
Old 07-28-2009, 05:03 AM
hot_mignacio
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Default Idle control and ECU

Quote:
Originally Posted by streamcast View Post
What was the procedure in your replacement. You have to replace both the IAC and the ECU at the same time and then performed the Idle relearn.
I have not replaced the ECU yet as this is really pricey. What I was to know is if I have the code p0505 does that prohibit my mechanic from performing Idle relearn? I was told it won't take but I'm not 100% sure if he even tried.
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