370z Fail Safe Mod - MAF error? - Help!

suavebrah

EDIT - SOLVED:
There was an issue with the throttle bodies. I had them replaced.

2014 370z Nismo MT

My car has been recently having issues where it will go into fail safe mode, dropping the RPM's low and limiting the acceleration. The codes were relating the problem to a faulty MAF sensor and originally I had thought it was due to my K&N drop in filters. I took those out, replaced both MAF sensors, and even had the main control unit recoded during service. The problem went away for a couple of weeks, but it is back again. It tends to happen more frequently right in the morning on a cold start. As I exit my apartment complex, and switch from 1st gear to 2nd, the car just ***** itself and goes into fail safe mode. I have to pull the car to the side, turn the car off, and then turn it back on after 10-15 seconds until the problem goes away... However, it seems to be happening more and more frequently. It has happened every morning this week (Tuesday, Wednesday, Thursday, and Friday).

I went to Nissan to pull the codes again and I got the following:

DTC REsults

Code: 2096 [P2096]
TIME: 9

Code: 2098 [P2098]
TIME: 0

Code: (TBD)AF B2 [P010B]
TIME: 1t

The first two codes (2096 and 2098) should be catalytic converter codes (I took my cats out over a year ago) so I don't think this could affect it because it never did in the past couple years that I've had this car

The last code (P010B) seems to be the MAF sensor again.. however as I mentioned before.. i already had the MAF sensors replaced.. so I believe there is something else that is affecting the MAF causing this issue.

If anyone has any idea please let me know

Nissan told me they would need to hold onto my car for a few days to try and diagnose the problem further at this point.. however they won't give me a rental in return because i voided my "warranty" which is BS..

the only mods i have is changed exhaust.. no engine mods. only exterior mods & exhaust/test pipes.

let me know!

Thank you

Jhill

How are they claiming you voided your warranty? In order for a warranty to be voided they have to prove what you did cause the issue. Until then it should be covered, just know that if whatever they find is related to whatever you've done then you will be responsible for the cost and rental.

Jhill

Also that's a bank 2 only code so if you replaced both MAF sensors then I would be looking at MAF data bank 1 vs bank two (gms and voltages). Possible pin fit issue or wiring issue in bank to MAF circuit.

Wilson2608

I agree with the wiring issue could be the problem. Your cars going into limp mode because of the MAF sensor code, not the Cats code (if you already didn't know that).\
Also, oiled K and N's have been known to destroy MAF sensor. Never had any issues with mine but it seems to be a pretty common problem.

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Jhill

Well he said he replaced both MAF's and still an issue so unless his bank two k&n is soaked in oil then it's doubtful that's the issue.

That said as a journeyman level tech for 12 years I have seen countless cars with MAF sensor issues from k&n filter (that don't cause MAF sensor issues, sarcasm).
That's why I went AEM dry filter for my stillen gen3. Indie labs also show better filtering so why deal with the hastle of outdated oiled filters for nothing.

suavebrah

Yeah but I actually got rid of my filters before replacing both MAF sensors, so that shouldn't be the problem anymore. It may be a wiring issue, but is that something you can see from an inspection? Because the 2-3 times I brought the car in to Nissan for an inspection/service, they couldn't find any problems.

SouthArk370Z

No. You (or the dealer) should be able to read the MAF signals via OBD/CAN to check for wiring problems.

I suggest opening all the connectors between the MAFs and ECM (see FSM for harness layout) and cleaning everything with contact cleaner.

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Jhill

Contact cleaner. Visual inspect female terminals (even better to do a drag test if you can find the male terminal somewhere), dielectric grease to prevent further issues. Back probe to check for 5v ref at MAF, back probe for ground, back probe on sig and check/record the voltage in histograph looking for any drop outs, also check freeze data from code set to see what values were vs MAF 1 when code set.

suavebrah

thank you for all the help, i'll update this thread when i find out more about the issue

ViCiouS

Replace the intake to stock and take it to a different dealer. They don't have to prove your mods caused the issue, they just have to prove your mods have ANY impact on the issue. The MAF code is why you are in limp mode.

The exhaust will not cause this and as such has zero impact on your limp mode or MAF code.

__________________
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suavebrah

sorry for the late reply, i fixed this problem a while ago

Problem was with the throttle bodies. They needed to be replaced & I haven't had this problem since

Thanks!

Jhill

Cool good to know. Odd the throttle body was the issue with now throttle tps codes. Usually drive by wire is extremely sensitive to any command vs actual throttle % values and will imediately throw a code and go limp mode