I didn't mean that at all - Saab 900 Bulletin Board - Saabnet.com
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I didn't mean that at all
Posted by Siegfried (more from Siegfried) on Wed, 24 Jul 2013 13:20:45
In Reply to: Dash Tach vs. Tach Signal to ECU, Sunset Park, Wed, 24 Jul 2013 12:55:05
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SP,
what I meant to say was that you can not troubleshoot and diagnose an issue if you are just replacing parts and bits. Another example to make it a bit more clear: with the engine mounts worn out you will get a bad and hard shifting and gears popping out. You go inside your tranny and see some shifter forks bent. You replace them and for the next 10K miles it shifts good, but then it starts shifts poorly and pops out again. Until you diagnose the issue, you will keep replacing the forks every N miles up to the day you send it to crusher until the shifter fork sources dry out whichever comes first.
On a side note regarding your last question - RPM signal is a logical one (small current signal). This means... ok, in simple English: no, there is not a chance that the dash instrument could ground out the whole signal and not leave enough for the ECU if you see your tachometer giving you your crank-up RPM readings. Moreover, if you tie it to either side - 12V or 0V - then you most probably will kill the RPM output buffer in your EZK ECU.
Zig
posted by 188.134.4...
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