Cam Sensor Nonsense... - 6MT.net Infiniti G35/G37/GTR Forums
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post #1 of 23 Old 05-09-2014, 10:32 PM Thread Starter
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Default Cam Sensor Nonsense...

What's up guys... I'll try to make this as short as possible... First off 2005 G35 Coupe 6MT revup.

So I get a 'service engine soon' light and my rpms stay around 1200 after the car warms up and slight loss of power. Get it checked 3 times (twice at Autozone and once at Oreilly's) they all pull P1084 which indicates EVT sensor or Bank 2 cam sensor.

I purchase the bank 2 cam (driver's side - angled) from Autozone. So when I remove the original sensor, it's straight! I try to install the new angled sensor and the harness won't fit. I then compared both and find the ends are slightly different. So then I think maybe it's for the other side and remove the passenger and it is straight as well. So I have two straight identical cam sensors (both part no. A29-640 C20) How is it that both are the same? Did the previous owner put the wrong cam sensor in bank 2? Sure looks like it.

Details for Crank and Cam sensors (see link below pg. 3)
Page 20 shows installation with correct part A29-632-LJ0 for bank 2

http://maxima.theowensfamily.com/tsb/NTB03-124.pdf

I checked Oreilly's, Autozone, and Advance Autoparts for bank 2 cam sensor and they are all angled but different harness connections than mine. I'll be going to the stealership tomorrow as soon as they open to explain. I'll definitely be picking up OEM A29-632-LJ0 when I go... but, I am just at a loss here guys. Any advice would be appreciated.

See pic below: left drivers shows angled sensor, mine was straight.
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'05 6MT DG Coupe

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post #2 of 23 Old 05-09-2014, 11:18 PM Thread Starter
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Starting to suspect I somehow have the wrong wiring harness for bank 2... Wow... Connector ends and tabs are just flipped from what I have... How in the heck does this happen? Smh...

'05 6MT DG Coupe
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post #3 of 23 Old 05-10-2014, 01:45 AM
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The dealer might offer some help but that seems tough to explain in any way that makes sense. It's like a previous owner did a DIY cobble job with the wrong parts.

You may have to call in the Cold Case Detectives !! lol
Let us know how it works out.

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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post #4 of 23 Old 05-10-2014, 07:52 AM
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The photo below shows the correct camshaft sensor locations and shapes.

Is there a part number from the old sensor from bank 2? Maybe you can cross reference it.

It's odd that your sensor harness is different.

'06 Autumn Copper FX35, '11 Alpine White Sentra & 2016 Red Hot Camaro 2SS
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post #5 of 23 Old 05-10-2014, 09:11 AM Thread Starter
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Both old sensors I pulled out of my car were A29-640C20, which is the correct part for bank 1. The angled sensor will not fit with my current harness. I've driven almost 4 years 60k with an oem bank 1 sensor installed on both sides! This is my first engine code and the car has run perfectly except for occasional pinging which I was able to resolve. I'm thinking I either keep rolling with the same sensor or get the correct harness from salvage or dealer and splice it. I would love to see if the car runs any differently with the rights sensors. Dealer opens in about 45 mins... Anxious to hear what they have to say...

'05 6MT DG Coupe
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post #6 of 23 Old 05-10-2014, 03:21 PM
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Maybe someone replaced it with the wrong part b/c of a mistake or the part not immediately available at the time the work was done. ... ?

I wonder if the wiring isn't a big diff but maybe the SES is related to some minor difference in resistance or something the computer picks up.
It may not effect performance at the motor in any way but it's probably better / easier to fix it then to figure a way (if there is a way) to test or verify it does/not cause any performance issues. ECU's fix and adjust so many things, it's possible something is correcting a slight issue w/o your knowledge except for the errant SES.

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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post #7 of 23 Old 05-10-2014, 06:44 PM Thread Starter
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Follow up... I went to the dealership and spoke with a mechanic and a parts specialist and they were just as confused as I was. Everything shows two separate sensors for banks 1 and 2. They brought out the OEM angled sensor and its connecter was the same as the ones from aftermarket I looked at earlier.

So I figured at this point that I could either snip the harness and try to find the correct one and splice it to accept the angled sensor... or just purchase a new bank 1 sensor and install it in bank 2... I went with the latter. I purchased two brand new OEM bank 1 sensors, installed them and cranked it up to a smooth idle, no SES light, and full power restored!

I took a real close look at all the wiring and could find no signs of splicing, re-working or anything and could find nothing out of the ordinary. Bachman, you make an interesting point that the ECU could be making minor corrections to compensate for the different sensor. Evidently, someone changed the wiring harness and I'm not sure why, but it actually works, so I'm not sure what to think about that either. For the record, my car uses two bank 1 sensors. No angled sensor is used at all. Oh well, I'm just glad I didn't have to buy an engine harness kit for my car.


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post #8 of 23 Old 05-10-2014, 07:31 PM
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I think the sensors may be the same internally but the bank 2 may be angled for ease of access. It's also possible that your car came like that from the factory as some kind of assembly line spot repair. I'm just guessing though.

The good thing is that you have a working car with no SES lights on.

'06 Autumn Copper FX35, '11 Alpine White Sentra & 2016 Red Hot Camaro 2SS
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post #9 of 23 Old 05-10-2014, 09:15 PM Thread Starter
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Originally Posted by Gilley View Post
I think the sensors may be the same internally but the bank 2 may be angled for ease of access. It's also possible that your car came like that from the factory as some kind of assembly line spot repair. I'm just guessing though.

The good thing is that you have a working car with no SES lights on.
It's possible it came from the factory like that the way you mentioned. My brother worked at GM for 30 years and mentioned several occasions like that. Like u said glad its working and that it didn't cost an arm and a leg to fix.

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post #10 of 23 Old 05-11-2014, 01:51 AM
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It's possible it came from the factory like that the way you mentioned. My brother worked at GM for 30 years and mentioned several occasions like that. Like u said glad its working and that it didn't cost an arm and a leg to fix.
I agree, probably the most sensible explanation.
As factory per assembly line, there was likely a very slim chance anyone thought there would be a need for service on it or much chance it would be discovered and cause questions.

Not sure that means it was 'approved' by a higher level supervisor but hey,,, they kept production going and made their line quota that day !!

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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post #11 of 23 Old 05-12-2014, 07:50 AM
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I just did this yesterday and ran into the same problem, until I realize that there are two similar looking sensors on the driver's side. I'm assuming the straight one that we both mistook for the cam angle sensor is the crankshaft sensor or something. The angled sensor is easy to see if you remove the throttle body and associated hoses/wires. I spent a good fifteen minutes trying to get the angled cam sensor replacement fit the wrong wiring harness where the straight sensor (presumably for the crankshaft) had been. I eventually found the correct sensor once I removed the throttle body. There is a picture on the g35 driver forum of the engine block, you will notice that the driver's side has two holes for the same style sensor in the engine block.
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post #12 of 23 Old 05-12-2014, 11:11 AM Thread Starter
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Originally Posted by P-Tittles View Post
I just did this yesterday and ran into the same problem, until I realize that there are two similar looking sensors on the driver's side. I'm assuming the straight one that we both mistook for the cam angle sensor is the crankshaft sensor or something. The angled sensor is easy to see if you remove the throttle body and associated hoses/wires. I spent a good fifteen minutes trying to get the angled cam sensor replacement fit the wrong wiring harness where the straight sensor (presumably for the crankshaft) had been. I eventually found the correct sensor once I removed the throttle body. There is a picture on the g35 driver forum of the engine block, you will notice that the driver's side has two holes for the same style sensor in the engine block.
I think we may be talking about something different here... The crankshaft sensor is underneath the engine on the driver's side. There are two cam sensors on the VQ35DE engine, one on the driver's side (angled, behind the throttle body) and one on the passenger side (straight). My issue was that the driver's side which is supposed to be angled was actually straight. My wiring harness will not accept the angled sensor as it has a different connector than the passenger side cam sensor and the crankshaft sensor. I know, it had me confused too as mine seems to be the only one setup this way. But glad you resolved your issue as well man. Cheers...
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post #13 of 23 Old 05-13-2014, 03:15 PM
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We very well could be, but if the wiring harness is different than I can almost guarantee you have the wrong sensor. Both sensors on the drivers side fit into the same size holes in the engine block, and they are only a few inches apart, if that. It seems less likely that your car got a completely different sensor with a completely different harness. Either way, I hope you get it figured out.

Patrick
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post #14 of 23 Old 05-13-2014, 10:27 PM Thread Starter
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Originally Posted by P-Tittles View Post
We very well could be, but if the wiring harness is different than I can almost guarantee you have the wrong sensor. Both sensors on the drivers side fit into the same size holes in the engine block, and they are only a few inches apart, if that. It seems less likely that your car got a completely different sensor with a completely different harness. Either way, I hope you get it figured out.

Patrick
When you mentioned 'both sensors on the driver's side' I was inclined to do some additional research on the web and finally was able to find a few examples of the back of a rev-up engine including some mention of it on g35driver.com. I then went outside to double-check my block and did in fact locate the other two cam sensors which are indeed angled. Doh! I remember the dealership showed me several engine diagrams, one with 4 cam sensor holes and one with only 2. Not much on the rev-up in comparison to non rev-up when researching so I didn't consider that option... Non rev has 2 cam sensors and rev-up has 4 with one straight sensor and one angled sensor per bank...so thank you for pressing this point.

Even though the code indicated bank 2 for the angled sensor, I suppose the other sensors needed to be replaced as well thus clearing the SES. Even though the car seems to be running perfect now, I am curious to see if there is a difference with all 4 cam sensors replaced. So I will be replacing the angled sensors in banks 1 and 2 as well now. So, thanks again man. Cheers...

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post #15 of 23 Old 05-14-2014, 03:15 PM
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Jake;

Here is a link to take your mind off the cam sensors.....


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The weather is here, albeit on/off. I'm starting to get the fever.

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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