4g63evo Posted January 10, 2023 Report Share Posted January 10, 2023 I've an Evo 9 with a link G4+ that is experiencing an issue with the Intake LH cam position sensor. It will error count every second while idling and at higher rpms - 2.5k+. Signal is lost every second. I've changed out the intake cam position sensor for a brand new one and the problem still persists. I've also inspected both cam position sensor trigger wheels and they're in their correct places. What could be the problem? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 10, 2023 Report Share Posted January 10, 2023 Set the cam angle test to LH Inlet and test pulse count to 4, do a PC log of it running at a few different RPM's like that. Attach the log and your tune here. Quote Link to comment Share on other sites More sharing options...
4g63evo Posted January 11, 2023 Author Report Share Posted January 11, 2023 Thanks for the quick response Adam. Being a noisy evo and having neighbours I had to do the logs during the day. Please find attached logs with old and new cam sensors. Also attached is the ecu map cam sensor error with new sensor.llg cam sensor error with old sensor.llg LINK G4 EVO TUNING MAP Jan 2023 cam sensor issue.pclr Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 11, 2023 Report Share Posted January 11, 2023 Everything looks ok hardware wise, it just looks like it has never actually been set up, it still has the offset from our base map in there. Go to DI 1 settings and change the offset to 52.5ATDC, I suspect that will be all it needs. Something else I noticed in your map - When you saved the copy of your map that you attached above, the MAP sensor was reading 66kpa (wrong) where as the BAP was reading 103kpa (most likely correct). The RPM was zero at the same time so these two pressures should match when the engine is not running. It may have just been a freak coincidence such as saving the map just at the exact same instant the engine stopped or something but it would pay to double check it is ok. Check that the MAP matches the BAP at the next powerup with ignition on, engine off. Also next time you run the engine, check again the MAP/BAP just shortly after you turn the engine off (could be something like a crimped vac hose keeping vacuum in it after shutdown). Quote Link to comment Share on other sites More sharing options...
4g63evo Posted January 11, 2023 Author Report Share Posted January 11, 2023 I've just set to 52.5 deg offset and it seems to be working well now! Thanks! Do the positions for the sensors look about right? I swapped the trigger wheel around the 2 possible positions for numerous times that I don't know if it's correct without taking the cover off. MAP & BAP are both 14.5psi when on but not started. If you can please have a look at the vvt positions and confirm these figures are correct it'll be much appreciated. Car will then be going back to the tuner for more boost!! :) Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 11, 2023 Report Share Posted January 11, 2023 3 hours ago, 4g63evo said: If you can please have a look at the vvt positions and confirm these figures are correct it'll be much appreciated. Car will then be going back to the tuner for more boost!! Position doesnt matter, the offset tells the ecu where the teeth are meant to be. Quote Link to comment Share on other sites More sharing options...
4g63evo Posted January 11, 2023 Author Report Share Posted January 11, 2023 Ok great. Thanks for your help Quote Link to comment Share on other sites More sharing options...
Adturb Posted January 26 Report Share Posted January 26 Jumping on to this thread- I’m not quite following the method of identifying the offset from the manual. Is 52.5 the stock offset from Mitsubishi? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 26 Report Share Posted January 26 This post is about the VVT ofsett - basically all you are doing is making the ecu report the cam position as "zero" when it is resting at home. There is no "stock offset" as there are so many stacked tolerances on every mechanical part that every engine will be different. Most stock ecu's do a position-learn procedure during cranking when it is started the first time after a battery disconnect. Quote Link to comment Share on other sites More sharing options...
Adturb Posted January 26 Report Share Posted January 26 Looking at this, the offset should be 50? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 27 Report Share Posted January 27 Yes. Quote Link to comment Share on other sites More sharing options...
Adturb Posted January 27 Report Share Posted January 27 Awesome- made more sense re-reading the manual after a coffee Out of interest, what would be the real-world effect of keeping the offset at 40 and then tuning? Would any value below 10 have zero effect on cam movement or would it limit the cam from using the last 10 degrees of advance? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 28 Report Share Posted January 28 The cam position would be able to go to "-10" instead of stopping at zero, the ecu will report errors and disable cam control if it goes more than a couple of degrees below zero. TTP and Adturb 2 Quote Link to comment Share on other sites More sharing options...
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