5-10 Grand Master
What color are pins 67 and 68 at the ECU on Motronic 3.1?
Hey, winfred, anyone, what colors are the wires that go to pins 67 and 68 on a '92 Bosch Motronic 3.1 non vanos ECU? I want to tap them but I really don't feel like tearing apart the ECU connector again... though I may have to.
Grand Master
67 is black, 68 is yellow, CPS isn't it?
Would you like me to e-mail you the pdf for 3.1 M50 1992 external wiring?
Javier
Edit: Tap on them, are you sure? If not taken with a high impedance method, signal may result useless. CPS is a magnetic pickup biased from the ECU 5Vdc, and a low impedance metering circuit may attenuate the output pulses to unacceptable levels.
Last edited by Javier; 01-08-2006 at 03:57 PM.
5-10 Grand Master
No I think i have the digram I was just not sure. Does your source say which is positive and which is negative?Originally Posted by Javier
Grand Master
Yellow goes into ground inside ECU, black towards 5Vdc.
Javier
5-10 Grand Master
Wait a minute...
don't you mean AC voltage?
Grand Master
It is actually a pulsating signal.
Javier
5-10 Grand Master
Righ tbut it should be AC
Grand Master
Well, not sure what you mean AC, ...
it is not a sine wave, nor constant frequency, but if you measure it with a high impedance tester, you will find an AC reading superimposed in a DC reading. The DC reading is useless, only biasing of the circuit, the AC signal is formed by a sequence of pulses following the teeth in the Crankshaft damper.
Javier
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