2005 G35 Auto - codes (P1716, P1815)

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cfauvel
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2005 G35 Auto - codes (P1716, P1815)

Postby cfauvel » Fri Jan 10, 2020 8:37 am

ok so in the mornings when cold (florida cold, so we're are talking at worst 50 degrees), the trans shifts REAL hard going up and down(throws the codes), until it warms up, then it behaves.

so P1716 is the turbine revolution sensor, which is the first sensor (closest to front of car) on the tcm (Transmission Control Module - on the valve body itself)...not replaceable by itself. Don't know what the second sensor is called that is right next to it(again on the tcm)

Someone I spoke with who sells remanufactured valve bodies says the sensors need to protrude through the tcm's plastic housing the thickness of two nickels. If it is 1mm short of that the sensor might not read the speed and throw the code.

P1815 is the manual switch circuit...now when you use your shift lever and push it to the right to go into Manual Mode that depresses a micro switch and tells the tcm that you are in manual mode, when you push up on the lever it momentarily presses another micro switch and tells the tcm to up shift, and when pulling back on the lever there is yet a third micro switch to tell the tcm to downshift.

My problem is I don't know if P1815 is referring to the shift lever's switches or the switches inside the tcm. I suspect it is inside the tcm

I have a nice scanner that reads live data from various systems, and under the transmission system I can read live data from the micro switches and see that the micro switches does indeed tell the tcm that the switch is on or off .

My gut is NOW telling me that when the TCM can't properly read the Turbine revolution Sensor's speed, it puts the transmission in Limp Mode (or similar) and prevents Manual mode (when the transmission acts up the display on the dash stays as D even if I try to go to manual) and throws P1815 too.


has anyone drop the valve body, taken off the TCM and inspect the two sensors to see if the amount they protrude can be adjusted?

Two places I found that remanufactures valve bodies are
https://streetsmarttransmission.com/rem ... alve-body/ - and will cost $740 (in Tampa, Florida)
www.softelectronic.com (out of Bulgaria of all places) and will cost $400...I don't think I'll go that route
(the valve bodies need to be flashed properly for your specific vehicle so be careful with that....both companies will do that)


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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby audtatious » Wed Feb 05, 2020 3:56 pm

https://www.nicoclub.com/FSM/G35/Coupe/2005/at.pdf

Don't know if you have looked through the FSM for this but it's linked above. This could be anything from faulty switches and components to bad electrical connections. Unfortunately I don't work on transmissions and can't help too much. Based on what you are seeing it seems to not be the micro switches but I would check proper continuity anyhow.

Good luck, hope you figure it out.

cfauvel
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby cfauvel » Thu Feb 06, 2020 7:05 am

Thanks for the reply , yep read the sections over and over again.

I've come to the conclusion that the TCM is putting the transmission into a mode that Manual Shifting is disabled when it throws the 1716. So concur that the microswitches in the shifter is NOT the problem.

So here is our new SOP (standard of operation).
We warm up the car to operating temp for about 5-7 minutes, before we attempt to drive it. AND surprisingly that DOES IT!!

Using my new scanner and reading live data of the engine rpm compared to input shaft rpm....I can see that ONCE warmed the RPM are close to being even, which is what the FSM says it should be....when cold the numbers are WAY off and when the CEL will come on and shifting acting poorly.


SOOOOOOO at this point I believe it IS an electrical connection on the TCM that makes a proper connection once the fluid is warm.

Just haven't dropped the valve body yet to inspect the TCM....and not sure I would find something either....

It is a messy job...but a couple of hrs to drop could lead me to finding the bad connection....but it could also NOT.....I am 99.99% a NEW-to-me remanufactured valve body would resolve everything...


I'll keep this thread updated.

cfauvel
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby cfauvel » Mon Jan 11, 2021 12:46 pm

UPDATE: So we've been living with the TCM/Valve body issues since Feb, byt simply warming up the engine, and driving it around the block in Gear 1. Once warmed up it shifted fine for the remainder of the day until cooled down enough.

Saturday we had our first issue whilst driving. We were on a highway and wife driving and knew the tranny threw the p1716 code as it was reving more than 3K at 75mph....(when I drive I perdioscally put it into M mode and see what number gear it is in if it says D I know it has to be turned off and back on to reset...)....so at speed it just slips out of gear out of nowhere and revs up to 7k...woman didn't know NOT to keep reving.

turned on hazard lights on and pulled over. Had her turn off the car wait 5 seconds and then restart the car. Put it into D and it drove fine for the remainder of the trip with the RPMs coming back down to 3K.

The next day (coldish day for FLorida mid 50s)) we did our normal warm up procedure then when to the grocery store....the tranny didn't want to shift pass 2md gear. Got to the store did our shopping and same thing on the way back...including the car starting to overheat.


using my new scanner, after the gear slippage I have WAY more codes now...some are related to Tire Pressure monitor, but most have to do with the tranny and valve body.
they are :
tranny related
P1730 - turbine rev s/circ
P1730 - Interlock
P1774 - L C brake solenoid
P1731 - 1gr e/braking

TPMS related
C1109 - Battery Voltage (abnormal)
C1709 - FR (this is the front right TPM sensor)
C1724 - batt volt low FL (front left TPM sensor)

ABS related
C1132 - engine signal 3
P1212 - TCS/Circ

Misc
P0455 - EVAP gross leak
U1000 - cam comm circuit
B2013 - strg comm1

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VStar650CL
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby VStar650CL » Mon Jan 11, 2021 12:59 pm

Sounds very much like that TCM is dying. The ABS codes are residual, from not getting proper speed signals from other ECU's when they go limp (in this case the TCM). By the way, Nissan TCM's that live inside the tranny all have a nasty habit of crashing the entire CANbus when they finally die. You put a scanner on it and only one or two ECU's show up, or maybe none at all. You disconnect the tranny and shazam, everything else wakes up and says hello with "U" codes everywhere. Bite the bullet and replace it before it bites your butt.

cfauvel
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby cfauvel » Mon Jan 11, 2021 2:07 pm

VStar650CL wrote:
Mon Jan 11, 2021 12:59 pm
Sounds very much like that TCM is dying. The ABS codes are residual, from not getting proper speed signals from other ECU's when they go limp (in this case the TCM). By the way, Nissan TCM's that live inside the tranny all have a nasty habit of crashing the entire CANbus when they finally die. You put a scanner on it and only one or two ECU's show up, or maybe none at all. You disconnect the tranny and shazam, everything else wakes up and says hello with "U" codes everywhere. Bite the bullet and replace it before it bites your butt.
Thank you for the reply and knowledge... I like it when people explain the whys ...I am child like that ' but why?'

yeah biting the bullet...cheaper than a new car.

I hope I don't have the dreaded coolant in the tranny syndrome. I'd prefer a separate tranny cooler...but I guess they want it internal to the radiator to warm up the ATF.

I'm going to go with these guys.
https://streetsmarttransmission.com/rem ... alve-body/
Last edited by cfauvel on Mon Jan 11, 2021 2:58 pm, edited 1 time in total.

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VStar650CL
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby VStar650CL » Mon Jan 11, 2021 2:35 pm

You're most welcome. Coolant in the tranny is easy to check, just pull the stick. If it's milky and opaque, it's too late. If it's slightly-milky but still translucent and pink, you can probably save it with a complete flush. Just have it towed if that's the case, don't put one more mile on it. The fluid will need a near-complete exchange, so a running power-flush is required to clear out the fluid in the torque converter. Merely dropping the pan won't do it.

cfauvel
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby cfauvel » Mon Jan 11, 2021 3:08 pm

VStar650CL wrote:
Mon Jan 11, 2021 2:35 pm
You're most welcome. Coolant in the tranny is easy to check, just pull the stick. If it's milky and opaque, it's too late. If it's slightly-milky but still translucent and pink, you can probably save it with a complete flush. Just have it towed if that's the case, don't put one more mile on it. The fluid will need a near-complete exchange, so a running power-flush is required to clear out the fluid in the torque converter. Merely dropping the pan won't do it.
Good news...the the ATF is perfectly clear.

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VStar650CL
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby VStar650CL » Mon Jan 11, 2021 3:39 pm

cfauvel wrote:
Mon Jan 11, 2021 3:08 pm
Good news...the the ATF is perfectly clear.
Sweet. New VB and you should be fine. :)

cfauvel
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby cfauvel » Sat Jan 16, 2021 5:04 pm

VStar650CL wrote:
Mon Jan 11, 2021 3:39 pm
cfauvel wrote:
Mon Jan 11, 2021 3:08 pm
Good news...the the ATF is perfectly clear.
Sweet. New VB and you should be fine. :)
UPDATE: today I tackled the Valve Body replacement....wasn't too bad but very messy...not fun doing it on your back.

The bad news is....I think it might have been a wasted effort or will only work for a short period of time...here's why I say that.
The ATF that came out, on a dipstick looked fine ...no milkyness and no signs of coolant in the pan or on the TCM, BUT the two magnets were pretty fluffy..no metal chips or anything but definitely something on there. Also when the ATF was poured into a clear container, the fluid was damn near black.

I bought 5 quarts of the Nissan Matic-S ATF, but counted 6 quarts captured. I have another 2 quarts coming in tomorrow and tomorrow I will start the car.

With the remanufactured Valve Body came instructions to do the following re-learn procedures
1 - Accelerator Pedal Released Position Learning
2 - Throttle Valve Closed Position Learning
3 - Idle Air Volume Learning.

We'll see tomorrow

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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby VStar650CL » Sat Jan 16, 2021 7:06 pm

I think the dry capacity on those is 11. If it's that dark but behaves itself after you fire it up, you might want to give it another change on a very short interval to remove some of what was left in the torque converter.

cfauvel
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby cfauvel » Sat Jan 16, 2021 7:21 pm

VStar650CL wrote:
Sat Jan 16, 2021 7:06 pm
I think the dry capacity on those is 11. If it's that dark but behaves itself after you fire it up, you might want to give it another change on a very short interval to remove some of what was left in the torque converter.
Just looked it up indeed and indeed it is 11 quarts...i thought it was 17 quarts...but nope 11...

Yeah good idea on doing another change in short order. the damn ATF is 15$ per quart

cfauvel
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Re: 2005 G35 Auto - codes (P1716, P1815)

Postby cfauvel » Sun Jan 17, 2021 3:10 pm

UPDATE: Ladies and Gentlemen,
WE HAVE A WORKING TRANSMISSION!!

I got my extra two quarts in today. Put the 6th bottle in and took it down the block...Already could tell the shifts were pleasant...(2-3 was a little harsh, but NOTHING like it was before).

Took it on a faster road and the shift were all smooth and went into to 5th. Took it easy for a good 15 minutes. The onto another fast road and put the throttle down enough to make it rev in the 3k area to get away from the traffic that were coming up behind me and all shifts were smooth.

Got home and checked the fluid and it was reading low for being hot...ended up putting in another 1/2 quart.

Tomorrow will be a good test...drive it with out the requisite warmup drive in 1st down the street... fingers crossed.


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