Nissan & Infiniti 3.7 litre V6, All Engine Sensors Explained: OBD4Everyone Ep.18

[@bobbofly]

for clarification, you technically will be *subtracting* the negative number from the positive number if you're doing it on paper. If you use your calculator, either use the subtract button, or else remember to signify the negative number's polarity if you decide to use the addition button. Basically easier just to use the subtract function.

[@georgelutu9610]

Could you, please do the same presentation for the 2015 Subaru Forester nonturbo?

[@OBD4Everyone]

Well.... as it turns out, I have easy access to that exact vehicle. It may take a while, but I will add it to the "to do" list.

[@Mewanrahnam575]

KEEP GOING WHERE ARE YOU..THE WORLD NEED TO LEARN

[@OBD4Everyone]

Hey Leon, I am here :) Don't worry, when I am not making episodes I am doing research for future episodes. AND I have got a lot of new information to share... I just need time to assemble it :)

[@juanmacias5215]

I love all this content you're doing. It's helping me understand more about my vq 6mt sedan. Thank you! I do have a question regarding the diagnostic report. I was able to figure out through the report that my throttle bodies are dirty. I had a couple issues were my car turned off on me right after a cold start. This happened twice. A few weeks in between each one. Anything I should be looking for on the report? I have motordyne art pipes and knn drop in filters. No check engine light on

[@OBD4Everyone]

Hey juan macias, The engine turning off just after you start it is a classic dirty throttle body symptom. Here is a link to How to clean your throttle body: kzbin.info/www/bejne/r4SuamyMl7iciqc Then make sure to follow these 3 steps after cleaning your throttle body: kzbin.info/www/bejne/fnrMknlmi8aHorM After you do the above, you should be all set! **NOTE*** After cleaning, some 2007-2008 G35 may need a ECU update for the "idle air volume" procedure to run. Two different people have reported this in the comment section.

[@milannarula3800]

Hi, just wondering which OBD2 connector you would recommend to use with this app for a Nissan 370z. Thanks!

[@OBD4Everyone]

If you have $140 USD, the OBDLink MX+ is my favorite OBD scanner. It is fast and comes with enhanced diagnostics for the G37/370z. For around $40, VeePeak BLE scanners also work well.

[@mohamedalwaari6677]

​@OBD4Everyone what about for QX50 2015?

[@pavankalyanmopidevi2291]

great work man.. very brief and accurate :-)

[@OBD4Everyone]

Hey Pavan kalyan Mopidevi, Thanks. There was a lot of research done to ensure everything is accurate :)

[@originalgibbs1584]

Thanks for the videos for our g37s . I have a question . My radiator fans turn on when my car is on ignition. ( motor not turned on) I’ve read on the forums that it could be the radiator Fan module needs to be swapped out . What’s your thoughts ? Couldn’t be a faulty temperature sensor giving false readings ? Today when I put the car on ignition the fans didn’t switch on until a couple minutes passed by.

[@OBD4Everyone]

Hey Vince South, I don't have any first hand experience with this fault. I would scan it for codes and see if there are any confirmed or pending codes. If the ECU thinks there is a problem with the temperature sensor circuit (P0117, P0118) it will turn on the fans. After a bit of searching, a bad rad fan module does look to be a common issue. So, if there are no codes, the rad module might be the problem.

[@MOHANSINGH-br8mp]

Great job sir please explain each sensor based on its working

[@OBD4Everyone]

Well, that is quite a large task since there are so many sensors/PIDs. You could just do an online search for each sensor to learn more about them and how they work.

[@geoff3172]

Great video as always...The mass airflow in g/s is there a formula or method to determine the value at idle...ie engine size etc....

[@OBD4Everyone]

Hey Geoff, As a rule of thumb, at idle the MAF airflow should be around the engine displacement. For example a 3.7 litre v6 should have a MAF airflow at idle of about 3.7 grams/second. AND if there are 2 throttle bodies, just divide that by 2 or 1.85 g/s. Or you can calculate it: power cycles per second = Engine RPM / 2 / 60 MAF Air flow = power cycles per second x air density around car (1.225 kg/m3 at sea level when 15C) divided by idle volumetric efficiency (~ 15%) For example: Engine RPM: 650 Air Density: 1.225 kg/m3 which is the same as 1.225 grams/litre Estimated Volumetric efficiency at idle: %15 650 / 2 / 60 = 5.41 power cycles per second Engine displacement x air density (depends on temperature and elevation) 3.7 x 1.225 = 4.53 grams Total mass of air at 650 RPM at wide open throttle (100% volumetric efficiency) = power cycles per second x grams of air per power cycle = power cycles per second x air mass = 5.41 x 4.53 = 24.5 grams/sec BUT idle is approximately 15% volumetric efficiency, so: 24.5 x .15 = 3.6 g/s Since this engine has 2 throttle bodies. just divide it by 2, which is about 1.8 g/s. Happy calculating!

[@geoff3172]

@@OBD4Everyone think I perfer the easy first method lol...thankyou much appreciated...my car is a 1.8L and one throttle body= 1.8g at idle...at full throttle is there an easy method to calculate

[@devasenathipathi8592]

@@OBD4Everyone Thanks for sharing, Good work sir!!

[@marshallburroughs4445]

Great stuff here. I’ve looked high and low for an oil pressure sensor and can not locate it. Any help would be appreciated. I’m using the Veepear BTE 4.0 module. Using several of the iOS apps. OBDFusion, Car Scanner & DashCmd.

[@OBD4Everyone]

Hey Marshall Burroughs, From what I have seen, most engines don't have an oil pressure sensor, just an oil pressure switch that indicated OK or low oil pressure. If there isn't a physical oil pressure sensor, there won't be a PID for it.

[@geoff3172]

Is there a useful pid to give indications that the engine is not breathing ie blocked cat....

[@OBD4Everyone]

Hey Geoff, The mass air flow (MAF) sensor should give you an idea of exhaust flow. If the exhaust is restricted, the air can't enter the engine as easy and the MAF will have a lower reading. Monitor or data log the MAF PID. Find a safe area and accelerate the car with the gas pedal to the floor and make sure the engine RPM get to about 5500 RPM. With your 1.8 at 5,000 RPM, the MAF air flow should be around 86 g/s. (based on the formula from the previous comment. 5000/2/60 x 1.8 x 1.15 (air density) = 86 g/s) You can also temporary remove the pre cat (sensor 1) O2 sensor and see if engine performance pick up or if the MAF increases at wide open throttle compared to the test above. Good luck!

[@Us3r_404]

Would love to know more about VVEL sensors

[@OBD4Everyone]

VVEL sensors? That is just a variable resistor that changes the output voltage based on VVEL position. However, I suspect that isn't want you wanted to know. Did you mean VVEL operation?

[@kentgregg9331]

Do you have a video explaining how to calibrate oversized tires in the windows touchscan software tool?

[@OBD4Everyone]

Hey Kent Greg, I don't think TouchScan can do that, according to this: www.obdsoftware.net/software/touchscan

[@kentgregg9331]

Touchscan by itself cannot, but I bought the professional add-on which states : Software sensor calibration Offset or scale any vehicle parameter and compensate for oversized tires (calibration in TouchScan/OBDwiz only). I messed around tonight with it and it seemed to affect the touchscan sensors but didn't change anything in the vehicle or computer. Any ideas?

[@OBD4Everyone]

Hey Kent Greg, I assume you are trying to correct the speedometer / odometer for the larger tires. Every generic scan tool OBD app/program I know, is read only. To modify the speedometer / odometer special and expensive tools are required, as it reprograms the ECU / PCM Good luck on your hunt!

[@TheLazydavid]

What's the normal range of EVAP System Vapor Presure number? You jumped over that :(

[@OBD4Everyone]

Hey TheLazydavid, I don't have a lot of data on that. However, on my 2011 Infiniti G37, when the EVAP monitor runs, it jumps to 550 Pa (0.08 psi) as shown by EVAP pressure PID. When the EVAP monitor is not running, it is very close to zero. Keep in mind, the OBD system reports this as a positive number, but the actual pressure is negative.

[@rushabhbrahmbhatt6543]

Great work!

[@OBD4Everyone]

Hey Rushabh brahmbhatt, Thanks! In a future episode I will show how to data log a few of the more interesting sensors and explain how to understand the data.

[@ceo4eva]

Great stuff, I wonder how you do this all! No new engines, stick to the VQ

[@OBD4Everyone]

Hey Christian Omenyi Jr, OK, one vote for VQ. That makes it easier for me :)

[@mcdonaldg2908]

Thank you thank you for explaining this pids.. Im using fusion app. With a veepek on android for a Saab 9-3 and i decided to try as many apps i can with the veepek adapter because ... Saab and Volvos are very very picky. So far the one i like is fusion its simple its well organize ... Torque is okkk but its messy in the way that it gets complicated. Besides Torque needs an update. Obd car is decent.. But all 3 apps can improve.. I could get a tech2 but im the only one who has a saab n il have to spend extra il be like around 900.. Maybe in the future .. Im subscribing and putting a thumbs up

[@OBD4Everyone]

Thanks for your comment and subbing. I also like OBD Fusion as it has better refinement than Torque Pro.

[@Minded_Tactics]

How can I read transmission fluid temperature on 04 g35 coupe with a WiFi OBDII

[@OBD4Everyone]

Hey MoSt HaTeD, I don't know... The next time I am at the scrap yard I am going to get a few transmission control modules (TCMs) to see what information I can get from them via OBD or the K-line.

[@RzVids]

So I got a code P0113, would I just switch MAF sensors since Bank 2 doesn’t use the IAT sensor?

[@OBD4Everyone]

Hey RzVids, I have double checked both the parts listing (both MAFs are the same part number: 22680-7S00A) and the wiring diagram... Yes, you can swap MAFs! This is a great way to trouble shoot and in this case fix your car for free! However, if the code remains, you will need to check the wiring and harness connections. Good luck and let me know if this fixes your problem.

[@RzVids]

Yes it fixed it! At 3:42 is what me think about swapping them. A mechanic suggested that I buy a new MAF sensor from him and was going to charge me $350 parts & labor. So he probably assumed there was a Intake Air Temperature Sensor on both banks since both MAF’s are identical. Thanks!

[@OBD4Everyone]

Hey RzVids, This is simply just fantastic!! I'm glad you thought of it!

[@jakesterhner713]

Very ingenious fix, Rz!

[@ronaldmahoney1283]

Your talking to fast and its hard to absorb the information!The content was Good! Could you give some info on gm, dodge, and Honda please, Thank You!

[@OBD4Everyone]

Sorry about talking too fast... Its something I done my entire life. As for doing this for other manufactures, I just don't have the experience on those to give typical values... BUT most of the sensors here will have the same function on other makes.

[@bahoni]

Thank you for the great videos! They are extremely helpful. I have a 2008 G37 Coupe (in U.S) and when I compared my OBD Fusion Report with your example, I saw that I am missing some of the PIDs, for example: SAE 0x0B Intake Manifold Absolute Pressure SAE 0x066 Mass air flow sensor A, B supported SAE 0x066 Mass air flow sensor A SAE 0x066 Mass air flow sensor B I understand some of the PID may be different between model years but Not Having Mass Air Flow sensor data worried me little since I have these Codes: P0138 P0158 P0037. I have been dealing with these for a while and cant resolve it. Any input will be helpful. Thank you for your hard work and very helpful channel. Bahoni

[@OBD4Everyone]

Hey Bahoni, Well... that is interesting! First make sure OBD Fusion is updated to the latest version. (They added PID 0x66 support a little while ago) Generally, any OBD scanner can only report on what it is told is available from the ECU. The $15 enhanced diagnostic add-on should give you the air flow voltage. (it does for my 2011 G37) Maybe since this was the first year for the VQ37, some items were left off? Your codes are all related to the oxygen "sensor 2" For the P0135/P0158: data log or graph the O2 voltage sensor 2 for bank 1 and 2. Do this at idle, then drive the car with easy acceleration, constant speed 50MPH, full throttle for 2-3 seconds, then lift off the throttle. With easy driving you should see the voltage cycle between almost 1.0 volt to almost 0 volts. At full throttle it should be more than 0.8 volts, and when you lift off it should be less than about .2 volts. Let me know what your results are. The P0037 is a problem with bank 2 (passenger side) O2 sensor heater. It is either a bad O2 sensor or a wiring problem. How old are the O2 sensors? I will see if I can get out and data log my post cat O2 sensors for comparison.

[@OBD4Everyone]

Hey Bahoni, I just double checked and there should be a "Mass airflow" PID in the enhanced diagnostic add-on under "Engine Control Module". If it is there for my 2011 G37, I suspect it should also be there for your 08 G37.

[@bahoni]

Hi OBD4Everyone, Thank you so much for your care and your helpful reply. I am using Veep..k OBDCheck as a scanner and the app is updated however, when I checked it to get that enhanced diagnostic add-on, It said its not supporting my car. Weird! Then I checked my car setting in the app, it says it is 2008 G37,so all good, right? Nope! I realized that for some reason, if I choose 2008 as the model year, G37 Coupe doesn’t come up in the model list! It only shows G35, which has a slightly different engine. So I choose 2009 instead and Voila! Now I can set my parameters right, even though my car is 2008, at least now it set as G37. I don’t think they did major changes to the engine from 2008 to 2009, but I could be wrong. Now I purchased the add- on and will do what you suggested and log the data and let you know. I want to give you little info on that ghost O2 sensor issue. First, I got the code P2A00. I swapped the Pre-cat sensors from bank 1 to 2 to see if the code changes. Still shows P2A00. Some Mechanic told me sometimes even the code generated by pre-cat sensor, the problem maybe in the post-cat sensor. So I replaced the Post-cat sensor on Bank 1. P2A00 code went away but now I got these Codes: P0138, P0158, P0037 which indicates a problem on Bank 2, correct? I just bought another post -cat sensor and was going to see if this will fix the problem. But watching your video made me stop because, after seeing and understanding better (thanks to you) what these sensors do, I am second guessing my purchase of buying another sensor. According to my last Data log(even though it was set for different engine and model), looks like my sensor are fine but my fuel trims are messed up: SAE 0x06 Short term fuel % trim - Bank 1= 0 SAE 0x07 Long term fuel % trim - Bank 1= 3.12 SAE 0x08 Short term fuel % trim - Bank 2= 25 SAE 0x09 Long term fuel % trim - Bank 2= 9.38 At this point, I am not sure what my next step should be. Maybe check for a leak around the exhoust manifold or the exhoust system itself? I am really sorry for this long reply. I will share the results after I complete a diag with your suggestions. Thanks again! Bahoni

[@OBD4Everyone]

Anytime :)

[@zuriel13g]

Where can I download this full list from?

[@OBD4Everyone]

Hey Zuriel Guillen, The sensor list (OBD Mode $01) will be different for different models and different years. The best way to get a list of your sensors, is to use OBD Fusion, run the diagnostic report, and email it to yourself. -OR- are you asking for a document (like PDF) that describes the sensors in the video?

[@zuriel13g]

@@OBD4Everyone I did mean a file of what was shown in the video, I have a G37xS. But I'll email the report to myself and get the list, thank you.

[@OBD4Everyone]

Hey Zuriel Guillen, That's the best way. The early G37 (until 2010) have different mode $01 PIDs than the later G37a (2011+)

[@gulabk65]

Good morning

[@OBD4Everyone]

Hey Gulab Keerio, Good morning to you.

[@suleymancakr6724]

what about honda ??

[@OBD4Everyone]

Hey Süleyman Çakır, Hmmm, let me see what I can do... What model of Honda or which engine?

[@pmessinger]

PID DOES NOT STAND FOR PARAMETER ID! Look up "sensor PID" here on KZbin and there are people who actually know what it means, and what it means to a sensor and computer control module. Hint: Proportional, Integral, Devivative. Watch the videos and you'll know what the ECM does, but PID is not a parameter.

[@OBD4Everyone]

Hey p.messinger, There may be more than one definition. I was going SAE Surface Vehicle Standard J1979, page 2, Appendix A and page 3, Appendix B. Thanks for your comment, I will search out those videos to see what they have to say.