Help! P0340 won't go away 2006 infiniti m45s

[Kerruptz]

Hi guys. This is my first post ever and I'm hoping someone can help me. I have done a search but no one seems to have experienced the same issue on a 2006 M45 to the point where even after replacing 2 sensors the issue still exists. Puzzling issue. Car started driving sluggish then check engine light came on. Took it to the shop, ran the codes and got P0340 - Camshaft position sensor A circuit (bank 1 or single sensor). Googled it and found out lots of people had similar issue for Nissan and infiniti. Here's the thing I have since replaced the sensor with a new oem one and the problem resurfaced after the car warmed up. Went ahead and replaced the crankshaft position sensor too hoping to get lucky because some ppl mentioned that. Still the check engine light comes on after the car warms up and with the same code. Checked the ground and battery voltage as per the service manual all is well. Anyone experience this before or have any suggestions? Any help appreciated. Car is still at the shop. Going to check on it tmrw before having to take it to infiniti worst case :s. also should mention I had the error code cleared each time and it comes back when warm to the point where the car won't turn over when hot. Only thing I did not do was relearn procedures. Think it's that simple and I need to? Any other thoughts or suggestions? This is stressing me out!

[elwesso]

I moved this to the M forum, I think you'll have more luck here..

I think the issue sounds mostly like a connection issue, are all the connectors clean and tight?

[Grantbo]

I had to replace a Cam sensor when my car randomly started to shut down. Am I having a false memory or are there 4 CAM sensors (Banks 1 and 2) and not 2? In my case, the sensor flagged by OBD was not acually the culprit, but another sensor. I hate to say it, but you might need to look at the other sensors.

[cruzad3r]

didn't see you state you clear the code - so go to autozone or advance auto or whoever have the OBD II scanner and clear the code.

has the car randomly shut down on you before you swapped the parts and does it still doing that now even after new parts are installed?

[Costee]

I believe there are two camshaft sensors-though the manual seems to suggest one. I'd suggest you change both. Let's also have the part numbers of the sensors.
Edit: Just found out that it's M35 that has two.

[Kerruptz]

Hi guys. Thanks so much for the replies and for moving the post. Here are some quick answers:

- the connections are clean and tight and so is the ground on both sides under the hood
- there are two camshaft sensors and one crankshaft sensor on the M45 if I am not mistaken
- I replaced two out of three (the driver side camshaft position sensor and the crankshaft position sensor under the car. Did not replace the other camshaft position sensor on the passenger side. I figured if that was the culprit the error code would say bank 2 no but from ur replies sound like that's a bad assumption
- the code was reset each time via obd-ii reader
- just so I can keep my sanity on the 2006 infiniti m45 the two camshaft position sensors are close to the front of the car on each side and do not have a bright green connector like how some of the other posts mention....right?
- I've never had any problems with the car before. It hasn't shut off with me driving but rather when it gets hot after being driven hard, when u turn it off and then back on it won't turn over and that's when the CEL and code reappear. Let it cool down and it's all good again and will start and drive with the CEL on. This started thursday and remains even after new sensors installed. Weird....sounds like I might have to replace the passenger side camshaft position sensor and see what happens like suggested
- will send part #s tmrw they are at the shop
- yes the car is exhibiting this weird behavior of CEL coming back and not starting before and after the parts and only when hot
- any other ideas? Car was dropped to infiniti tonight. I'm kinda worried about the outcome hope it's simple and something we have overlooked like the relearn procedure for throttle or it needs conzult to reset? So weird to me

[candymanfb]

I had to change all three sensors!
The way the trouble codes come were not straight forward when I had my issue. After the third sensor was changed all was good.

[Costee]

I'm puzzled here. The error code P0340 is for bank 1, and P0345 is for bank 2. In the ESM only P0340 is described for VK45, while the VQ35 has the two. My 6th Gen Maxima which is also VQ35 has two and can distinctly be seen. On my M45 I see the sensor on the driver's side (and it has a green connector), but cannot locate a counterpart for the passenger side.

[Kerruptz]

Problem solved!!! Well I hope. So far so good don't want to jinx it.

So apparently regardless of what the p0340 code says, it could relate to the camshaft position sensor and the crankshaft position sensor. On the m45, there are a total of 4 sensors - 2 camshaft and 2 crankshaft. The 2 camshaft sensors are at the top front of the engine one on each side driver and passenger. These cost around $90 each. I replaced the driver side but it didn't fix the problem. Then there are two other sensors that I am going to label as crankshaft position sensors. One one the front lower centre of the engine (you have to remove the air box to get to it). Then there is another under the engine in the back by the transmission. I replaced that one and it did not solve the problem. Infiniti changed the one under the air box and all is fine now! The mechanic said that is the specific one that has to do with the exact code p0340 camshaft sensor (PHASE). So basically I changed 3/4 sensors and I'm looking ok now.

Thnx guys. Ill post part numbers later so hopefully someone can benefit in the future.

[Costee]

Nice. We await the part numbers.

[Kerruptz]

Here they are:

Top sensor driver side that I have referred to as camshaft position sensor: 23731-2Y52A. Cost around $90. I replaced only driver side and not the equivalent on passenger side.

Lower two sensors (under air box) and under at back of engine by transmission that I have referred to as crankshaft position sensors - 23731-4M50A. Cost around $40 each. I replaced both.

Now I might have the names of the sensors wrong but at least the part #s should help. All of these darn part boxes are labelled "crankshaft" as well.

[Costee]

Here they are:

Top sensor driver side that I have referred to as camshaft position sensor: 23731-2Y52A. Cost around $90. I replaced only driver side and not the equivalent on passenger side.

Lower two sensors (under air box) and under at back of engine by transmission that I have referred to as crankshaft position sensors - 23731-4M50A. Cost around $40 each. I replaced both.

Now I might have the names of the sensors wrong but at least the part #s should help. All of these darn part boxes are labelled "crankshaft" as well.

Thanks for the feedback. This is what I've since found out. The part number for the camshaft sensors is 23731-2Y52A (old number was 23731-2Y524). For some reason it is also called the Valve Timing Control (VTC) Sensor; on some other Nissan models it is the Magnet Sensor. The part number for the crankshaft sensors is 23731-4M50B (old number was 23731-4M506). The first one, which is located in the engine bay is the Sensor Phase with a part code of 23731U, while other under the transmission has a part code number of 23731TA. For the M45, P0340 is an unhelpful code for the problems emanating from the two cams. The more directly related codes are P1140 and P1145 called IVT CONTROL POSITION SENSOR for banks 1 & 2 respectively. Since the ESM describes the camshaft sensor in P0340 as phase sensor, it would appear that the driver's side camshaft sensor and the phase crankshaft sensor below it are associated. At any rate it is always preferable to change the crankshaft sensor alongside the camshaft sensor as the damage to the latter usually comes from the former.
You'd notice that there's a slight variation in the part number you quoted from mine for the crankshaft sensor. The Infiniti dealers online I checked don't have that number. However, Nissan Parts Zone has both numbers: 23731-4M50A--$36.99 ; 23731-4M50B--$72.79 ($69.43 at Infiniti Parts Department). I wonder what to make of the disparity in number and price.
Enjoy your car.

[Kerruptz]

Costee you are awesome man. I'm in Toronto Canada wonder if that could have anything to do with the Nissan part# discrepancy? That's for sure the num I wrote no typo I double checked.

[Costee]

Costee you are awesome man. I'm in Toronto Canada wonder if that could have anything to do with the Nissan part# discrepancy? That's for sure the num I wrote no typo I double checked.

You're right about the part#. I suspect the discrepancy is a result of the fact that the part you've used is for a Nissan model (probably Pathfinder/Titan/Armada), and the other is for Infiniti, although both are compatible.
[Oh, I'm in Lagos, Nigeria]

[Kerruptz]

Good to know!