Markie Posted September 26, 2013 Share Posted September 26, 2013 Has anyone got experience with these? What do they do and where are they located? Suddenly getting shutter and misfire tonight on way home.. Reset fuses etc and the error code I had when getting home was 35. Used the VVTi E1 TC wire trick to get the code.. Any ideas please? I thought it could of been the Wynns injector cleaner I used the other day in the fuel, so filled tank hoping if it was that it would dilute it.. It's been working for days since adding it to the tank though. Quote Link to comment Share on other sites More sharing options...
Markie Posted September 27, 2013 Author Share Posted September 27, 2013 Anyone got any pointers on this one? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted September 27, 2013 Share Posted September 27, 2013 (edited) Not familiar with an HAC Sensor, can you elaborate? After a little googeling its seems its an altitude compensation sensor with little effect and so far as I can see only fitted to the 7mgte during 88-89 don't think it was ever fitted to the 2jzgte from what I can see, unless it was only the US models. Edited September 27, 2013 by Tricky-Ricky (see edit history) Quote Link to comment Share on other sites More sharing options...
Markie Posted September 27, 2013 Author Share Posted September 27, 2013 Weird.. As error 35 in the error code manuals refers to the HAC sensor/circuit Quote Link to comment Share on other sites More sharing options...
Markie Posted September 28, 2013 Author Share Posted September 28, 2013 Just been doing some reading.. From what I gather the HAC/Barometric sensor is in the ECU. Flow charts asks if there are any other codes, if answer yes continue, if answer no, replace ECU or ECM as they refer to it off the PDF I was reading. Any ball park figure for a 98 VVT-i second hand one? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted September 28, 2013 Share Posted September 28, 2013 (edited) From what I have just read from the manual, the HAC circuit is linked to the turbo pressure sensor (MAP sensor), and you need to check both the harness and the turbo pressure sensor, see page EG370, which its more likely to be, as if its the HAC then you will have to replace the ECU as its part of it, is the engine in limp mode? IE you cant rev more than 2,500RPM. Edited September 28, 2013 by Tricky-Ricky (see edit history) Quote Link to comment Share on other sites More sharing options...
Markie Posted September 30, 2013 Author Share Posted September 30, 2013 Rightio.. Done some stuff. o Opened up ECU. No sign of scorching or burn. No smell either. Refitted. Still the same. o Cleaned Air Cone and Air Sensor. Refitted. Still the same. o Disconnected battery - It does not enter limp mode, no engine light or warning light either. - Idles fine - Seems to be ok lowish revs aswell, but then start cranking it up a bit and you get mis-fire/stutter. I feels like when I needed to change the O2 sensor and you can fele it mis/stutter. This though is a much more violet noticeable affair. I get the feeling its not the ECU, but after clearing the codes I still get the same one greeting me when getting home (Error 35) Error 35 (Turbo Pressure sensor circuit) is what I found now, no idea where I got HAC from, seems there are a few screen shots for the Supra where the same codes mean slightly different things.. Anyone know what I can check for this error? Could it just be a Turbo sensor gone wrong. Where about is it in the bay? Got the feeling there are more than two? Quote Link to comment Share on other sites More sharing options...
Markie Posted October 3, 2013 Author Share Posted October 3, 2013 Is the Turbo pressure sensor the one above the turbos and where the air intake pipe comes into the top before it goes into the turbos..? Is there only one as well? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 3, 2013 Share Posted October 3, 2013 (edited) Is the Turbo pressure sensor the one above the turbos and where the air intake pipe comes into the top before it goes into the turbos..? Is there only one as well? The sensor is bolted to the inside face of the plenum near the back of it, it has one reference 6mm tube and a electrical connection plug. Here, Edited October 3, 2013 by Tricky-Ricky (see edit history) Quote Link to comment Share on other sites More sharing options...
Markie Posted October 3, 2013 Author Share Posted October 3, 2013 Nice one.. Thanks. This is prob the cheapest and easiest thing to try first. Quote Link to comment Share on other sites More sharing options...
Markie Posted October 7, 2013 Author Share Posted October 7, 2013 Spoke to Toyota who are after £260 for this little sensor. Does anyone have one spare I can borrow or buy? If it was like £30-40 I would just get and try, but its a tad expensive if it is actually not the issue. Was thinking of getting Toyota to do a diagnosis to double check, but not sure how much that is... Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 7, 2013 Share Posted October 7, 2013 They can be bought from ebay for about £100 but that's from the states. Quote Link to comment Share on other sites More sharing options...
drift_bear Posted October 7, 2013 Share Posted October 7, 2013 You could always drop keron on here a pm asking if he has any in stock Quote Link to comment Share on other sites More sharing options...
Markie Posted October 8, 2013 Author Share Posted October 8, 2013 Nice one bear.. Will do.. On a side note.. If the issue is the pressure sensor, would my boost dials not being reading correctly, because a moment they look fine. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 9, 2013 Share Posted October 9, 2013 Nice one bear.. Will do.. On a side note.. If the issue is the pressure sensor, would my boost dials not being reading correctly, because a moment they look fine. No the std MAP sensor has noting to do with any aftermarket boost gauge. Quote Link to comment Share on other sites More sharing options...
Markie Posted October 9, 2013 Author Share Posted October 9, 2013 Holy shit... How can this small unit be so expensive! Just removed it to have a look and there is nothing to it. Quote Link to comment Share on other sites More sharing options...
Markie Posted October 19, 2013 Author Share Posted October 19, 2013 Update.. Had a Turbo pressure sensor from Brad. Try it this morning, still the same.. I have not reset the ECU yet, but I don't think it's gonna matter. But I will and see if I still get the Error Code 35 What I did do though from reading another Supra forum is test the voltage to the sensor which is meant to be about 4-5v and mine is showing 4.8-5 so does this mean the wires and ECU are fine? It is starting to look like a Toyota diag now Don't know if it's me, but the engine temp does not seem to reach it's usual temp, it seems to run a bit cooler going off the gauge. Car still idles fine and seems ok at normal running. When Turbos seem to get more involved though it does start playing up again. Would O2 sensor gone cause it? I did not think so as it was an instant problem from all fine and we'll and the next second, problems and very noticeable problems. Not like a more subtle misfire/splutter I have had before when O2 sensor needed changing, Quote Link to comment Share on other sites More sharing options...
Markie Posted October 19, 2013 Author Share Posted October 19, 2013 Just read a bit more.. If it's a FCD problem, would the ECU still log the fault or would ECU see all is well as the FCD is just an add on? I use a HKS FCD. What I think I am trying to say is that does the signal from the Turbo Pressure Sensor go back to the ECU via the FCD? Quote Link to comment Share on other sites More sharing options...
Markie Posted October 20, 2013 Author Share Posted October 20, 2013 Done some voltage checks today.. Seems like the sensor is feeding back voltage correct. With ignition on I had 2.4v Idle about 3.4v Disconnected FCD just in case it was that but still the same problem and error 35. Anyone got anymore idea or is it possibly ECU ? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 20, 2013 Share Posted October 20, 2013 (edited) Well it wont be an O2 sensor as this is no longer used once on boost the ECU is then in open loop. Edit just read your spec, and noticed your running iridium plugs, have you tried changing them for copper core and running 0.8mm gaps? Edited October 20, 2013 by Tricky-Ricky (see edit history) Quote Link to comment Share on other sites More sharing options...
Markie Posted October 20, 2013 Author Share Posted October 20, 2013 No not done that.. But they been good so far and this problem was instant. One second car was fine, next stutter and like a misfire. Would it report this code though if it was just plugs? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 20, 2013 Share Posted October 20, 2013 (edited) No it wouldn't but I was curious to see if thing improved, you say the onset of the problem was sudden, had you done/changed anything before it happened? The fact that the error code give two possibles and that the MAP sensor has not improved things, then the next logical step would be to try and sap out the ECU for a know good one and see what happens. Edited October 20, 2013 by Tricky-Ricky (see edit history) Quote Link to comment Share on other sites More sharing options...
Markie Posted October 20, 2013 Author Share Posted October 20, 2013 Only the Wynnes fuel injector cleaner which was in it for two days previous. Quote Link to comment Share on other sites More sharing options...
Nodalmighty Posted October 20, 2013 Share Posted October 20, 2013 It's rare these sensors go. I would be more inclined to inspect the wiring to the sensor and the connector pins. There are only 3 wires, 5v, signal and ground. Old cars are now showing loom issues. I had to rebuild a TT auto loom not so long ago as it had the same issues as you with misfires over 10 psi. There is bound to be someone on here can sell you one for around £20 notes. Quote Link to comment Share on other sites More sharing options...
Markie Posted October 20, 2013 Author Share Posted October 20, 2013 Well I did have a multimeter checking voltage changes and it did seem to be reporting ok like mentioned in my earlier post today. Which part are you referring to as I think of a loom as the huge mass of wires by the ECU? Quote Link to comment Share on other sites More sharing options...
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