Car will not start after tuning

ShadowJester6

Ha. Even according to the actual Nissan techs, there is "nothing wrong" with the car. They used their fancy pants Nissan only computers and allegedly there is nothing wrong with any part of the car. It just doesn't turn over. Because that makes sense. They offered to start swapping out the car piece by piece starting with the IPDM for a low cost of $2.2k for the fuse box alone, not including labor, diagnostics, etc. Instead, they spliced into the IPDM to bypass the entirety of the start circuit using a toggle switch. So you can start the car and it seems to run (mostly, see below) fine now. I have since ordered another IPDM (this is the third one, including the original) and again, no change. The only thing left is to literally swap every single computer (ECO, BCM, FOBs, FOB receptacle, etc.) at once to ensure all the IDs and everything match and that still may not even fix the problem. Also after receiving the car from Nissan, the gear indicator on the dash no longer works and you can no longer turn on sport mode/rev matching. Again, no trouble codes, no blown fuse, no anything "wrong" or "broken" with the car according to me or Nissan. I am beyond over this car.

SonicVQ

In my opinion, this is a hint. S-mode requires the following inputs to be good:
• cam/crank signals
• clutch pedal / clutch interlock
• gear lever position sensor
• Input shaft speed sensor from transmission
• vehicle speed from gauge cluster

I would verify and/or re-verify those signals.

xyrtek

If I understand the starting circuit as well as I think I do, once the Starter Relay gets the signal from the BCM and actuates the issue must be on the IPDM E/R.

So replacing/troubleshooting the IPDM E/R seems like a logical step to me.

M/T : System Description INFOID:0000000011735111
• When the clutch interlock switch is turned ON, power is supplied to starter relay and starter control relay.
And BCM and IPDM E/R (CPU) detect clutch interlock switch condition by the inputted signal.
• When starter operating condition is satisfied, IPDM E/R turns starter control relay ON by starter control relay
control signal.
• When engine cranking condition is satisfied, BCM turns starter relay ON by starter relay control signal.
• Then battery power is supplied to starter motor (“S” terminal) through starter control relay and starter relay.
And IPDM E/R (CPU) detect starter relay condition by the inputted signal.

Since you have mentioned that you have B26E8 I would suggest triple-checking that.

Page 76 on SECURITY CONTROL SYSTEM

nismo370zniki

Hi,
I am hoping that you found a fix for this issue?

My 2013 370z just had this issue after installing a Z1 uprev tune and now is stuck in the same issue of acc, on and off.

The car was running perfectly well, I pulled in in the garage and the next day I installed 3in intakes and their plenum on the car and successfully flashed the tune on the car, everything seemed to go well, except when I went to start the car and... well here I am searching to see if anyone else has had this issue before and what they did to fix it.


Seems like this is the exact same issue you had.

nismo370zniki

Hi,
I am hoping that you found a fix for this issue?

My 2013 370z just had this issue after installing a Z1 uprev tune and now is stuck in the same issue of acc, on and off.

The car was running perfectly well, I pulled in in the garage and the next day I installed 3in intakes and their plenum on the car and successfully flashed the tune on the car, everything seemed to go well, except when I went to start the car and... well here I am searching to see if anyone else has had this issue before and what they did to fix it.


Seems like this is the exact same issue you had.

nismo370zniki

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