Andy Blyth Posted October 16, 2010 Share Posted October 16, 2010 Does anybody know the relationship between the crank and cam sensors and the engine cycle on a TT? I've looked far and wide for info. So far I've determined that the crank sensor has 24 falling edges per engine cycle (12 per rev) and the cam sensors are 1 falling edge per cycle. The two cam sensors seem to be about 360 degrees apart. I understand that one of the cam sensors indicate that the next edge on the crank is so many degrees BTDC #1. Which of the two cam sensors is this, and at what angle BTDC #1 does the crank reference occur at? Please don't make me take my engine apart to find out! The service manual is no help. Cheers Andy Quote Link to comment Share on other sites More sharing options...
bondango Posted October 17, 2010 Share Posted October 17, 2010 NE is you crank signal (24p per revolution) which is 30 degress per pulse G1 and G2 are your cams Sensors. G1 and G2 are 360 degrees out of Phase and represent Cyl1 and Cyl6 approaching TDC on the compression Stroke. ECU then can generate the IGT signal and also the Cylinder identification signals (IGdA and IGdB) for the igniter (coil selection) Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted October 17, 2010 Share Posted October 17, 2010 This is good info Quote Link to comment Share on other sites More sharing options...
Andy Blyth Posted October 17, 2010 Author Share Posted October 17, 2010 NE is you crank signal (24p per revolution) which is 30 degress per pulse G1 and G2 are your cams Sensors. G1 and G2 are 360 degrees out of Phase and represent Cyl1 and Cyl6 approaching TDC on the compression Stroke. ECU then can generate the IGT signal and also the Cylinder identification signals (IGdA and IGdB) for the igniter (coil selection) Thanks for that! It's going to take me a little while to get my head around, it's a bit different to what I expected. Where did you find it? I've looked everywhere I could think of and didn't come across it. Quote Link to comment Share on other sites More sharing options...
bondango Posted October 17, 2010 Share Posted October 17, 2010 Thanks for that! It's going to take me a little while to get my head around, it's a bit different to what I expected. Where did you find it? I've looked everywhere I could think of and didn't come across it. Its from a lot of research stuff i gathered up a few years ago when trying to find a solution to the emanage blue ignition problem when used with UK spec supra's as the ecu's ignition circuity differs than that of the Jspecs. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.