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P1800 ES 1800 1973

posted by  Ron Kwas on  Thu Aug 22 06:30 CST 2019
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last visit: Fri Oct 24 04:03 CST 2014
[RELATED]

142g;

...correct of course about the PNP transistor switches in ECU, but after looking at it a while more, I realized that I actually got the theory of operation explanation slightly wrong...one would read 0V on BOTH sides of the Injectors, and only see the 3V under dynamic operating conditions with a catch-and-hold DVM or scope...

I have made a mark-up of an excerpt the Kerfoot drawing showing the output stages of ECU with voltages at Injectors under transistor ON and OFF conditions:


Cheers

Edit: I have just added this graphic, plus associated notes to the D-Jet page. See: https://www.sw-em.com/bosch_d-jetronic_injection.htm#Dynamic_and_Static_Injector_Test_Notes





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