Wiring O-scope to ECU harness - Saab Performance Bulletin Board - Saabnet.com
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Wiring O-scope to ECU harness
Posted by Vigge [Email] (more from Vigge) on Sun, 17 Apr 2005 05:15:51
In Reply to: Looking forward to your documention, ckpaden, Sat, 16 Apr 2005 14:01:04
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To get RPM one should connect the O-scope to ECU pins 17 and 18. (colors YE and BK) These pins are for crank shaft position sensor. The crank shaft sensor has 58 slots, so one needs to divide the measured frequency by 58 and multiply by 60 to get RPM. On idle the measurement result should show ~800Hz between pins 17 and 18
MAF can be measured between ECU pins 65 (color GY/BU) and 25 (power ground). To convert MAF Hz to g/s use the regression equation posted in one of my earlier posts.
NOTE this equtation is valied from 40g/s and up due to the fact that the hz vs. g/s correlation is based on two seperate curves.
I will give this a try tonight if I find the time.
posted by 81.197.251...
Posts in this Thread:
- Any thoughts on Digimoto OBDII reader?, elliott, Thu, 14 Apr 2005 17:36:15
- You might also consider Autoenginuity, mikey, Fri, 15 Apr 2005 16:07:14
- Re: Any thoughts on Digimoto OBDII reader?, rico, Fri, 15 Apr 2005 11:17:32
- serial data, jak
, Fri, 15 Apr 2005 08:37:40 - Re: Any thoughts on Digimoto OBDII reader?, BrianS, Fri, 15 Apr 2005 07:20:49
- It's not that bad, ckpaden, Thu, 14 Apr 2005 18:00:23
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