Cleaning or replacing the A/T temperature sensor

[Infinitiguy19]

Ever since Peter at ECU Talk made Active Suspension support possible I have been using my Laptop Consult cable because his progress gave me hope.

Assuming my half a** *E-Mance Laptop Consult works as it should then my transmission temperature sensor is malfunctioning and needs cleaning or replacement. When the vehicle is cold (in the summer) with a engine coolant temperature of ~80*F the transmission temperature sensor reports a voltage of 2.5 volts. When the vehicle is fully warmed up (176*F coolant temperature) the transmission temperature sensor reports a voltage of 1.5 volts.

Clearly there is something wrong somewhere and that would explain some issues with my car. But it would not explain why it shifts into 4th gear (overdrive) with the sensor reporting such a voltage (Cold).

How hard is it to replace or clean the transmission temperature sensor?

Could the Laptop Consult software convert the A/T temperature sensor voltage to actual temperature?
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*I bought a Laptop Consult cable from E-Mance and when I received it it would not work with my OEM 1993 Infiniti Q45 ECU. It would not work with the vehicle turned on that is, but whats a consult if it doesn't work with the engine on. I called him up and I got the voice mail so I left a message. I emailed him and he responded and offered to replace the cable. The replacement cable has the same problem and only works with my 1994 Infiniti Q45 ECU (California edition). He basically fell off the world and claims he has family issues. When I sell something I make sure the buyer is happy despite what ever problems I have, Because the buyer doesn't care about my problems they only care about the product they bought.

He never answers his phone and I have never received my money back despite asking him for it. I paid $50 for a dead cable.

I would have posted this in the General section but I vowed to never post there again along with F50 (2002-2006) Q45 topic, M35-M45 Forum and VK45DE (F50 Q45 engine) and the Nissan Rogue forum.

[NewKleer]

how do you know something is wrong with the temp? does the service manual say that the voltage should go higher with temperature? some are reverse (high volt = low temp, and vice versa). if the service manual gives you any voltage/temp graph, you could convert it yourself.

looks like you've discovered, like many others, how dodgy emance is. he hacked OBD Scantech (which is now free, but dont think it was at the time) to make it look like it was emance software and was included with the consult cable he sells, which itself is a rip of calumsult's DIY design (which was intended for DIY, not commercial selling)... so not surprising if there was an issue with cable he wouldnt know what to do, since its not his design - although, having said that, the issue could be with your car.

[Infinitiguy19]

The service manual states that when the fluid is 68*F (20*C) the A/T temperature sensor voltage will be approximately 1.5 volts. When the fluid reaches 176*F (80*C) the A/T temperature sensor voltage will be approximately 0.5 volts.

The manual only gives those two values but I am sure I can work out a graph.

Yes unfortunately and this was when I trusted many people so E-Mance kind of helped me become a cynical cold hard bastard. I take it those boards cost $20 MAX to make right? And he sold them for twice that which he shouldn't have to begin with.

He should be sued after all I read how many people liked his consult boards on Ebay and his "ROM" tunes. All that is probably is coolant sensor adjustment.

The guy is a disgrace and a pathetic excuse for a human being.

I once thought it was my car or the Engine Control Unit rather but having a local Infiniti dealer being able to run a power balance said otherwise. I think its the way that E-mance made the cables that is the problem, not my ECU or Consult port.

[Q451990]

So your temp sensor is following the trend that the FSM says it should (lower voltage with higher temperature)

I would suspect it's one of those programming glitches, like the difference in displayed timing vs. actual... I would check it with a good VOM meter before you start replacing parts.

Heath

[Infinitiguy19]

So your temp sensor is following the trend that the FSM says it should (lower voltage with higher temperature)

Yes it does follow the trend.

I would suspect it's one of those programming glitches, like the difference in displayed timing vs. actual... I would check it with a good VOM meter before you start replacing parts.

Heath

I sure hope so but at the same time as Q45Tech said the Laptop Consult displays the same stuff as a regular Nissan Consult.

Peter at ECU Talk might be able to explain more about the timing annoyance but I did hear him say that american Nissan's display timing differently.

I could unplug the A/T solenoids harness connector and test the correct pins but I have a feeling that that would give me the same reading as the Consult.

Thank you Peter and Heath for responding!

[NewKleer]

USA cars read 35 deg higher than actual timing. so unless the program has timing offset option (like ecutalk does), youll need to subtract 35deg from shown timing. e.g. 50deg is actually 15.

[Infinitiguy19]

USA cars read 35 deg higher than actual timing. so unless the program has timing offset option (like ecutalk does), youll need to subtract 35deg from shown timing. e.g. 50deg is actually 15.

Why do they read higher, I have always wanted to know?

[NewKleer]

i want to know also. but thats a question for whoever stuffed up the maths at nissan in USA. not the only mistake thats been made - not a huge deal, but whoever did the diesel consult programming (nissan consult unit side, not ECU side) got the calculation for diesel RPM off by 1 rpm most of the time.