1987 740 Turbo wont start, please help!
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Joined: Nov 2014
Posts: 57
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From: So Cal
and THIS wiring diagram, for the contemporaneous 760 Turbo, the LH2.2 and EZ117K pages for the B230FT, they show ECU pin 12 coming from ICU pin 15 (different car, but same ECU and ICU).
http://www.k-jet.org/files/greenbook...g_diagrams.pdf
in fact, that other 'all car' diagram shows the same thing, its just harder to read. In "S6" of that hard-to-read diagram, you'll note that EZ-K ICU 260 pin 15 is a red/black wire to LH ECU 217 pin 12. Near as I can tell, this is the knock control fuel enrichment signal... the ICU senses knock, and tells the ECU to richen it up..
http://www.k-jet.org/files/greenbook...g_diagrams.pdf
in fact, that other 'all car' diagram shows the same thing, its just harder to read. In "S6" of that hard-to-read diagram, you'll note that EZ-K ICU 260 pin 15 is a red/black wire to LH ECU 217 pin 12. Near as I can tell, this is the knock control fuel enrichment signal... the ICU senses knock, and tells the ECU to richen it up..
Thx for passing on the green book diagrams. Sure helps to put the pieces together. Now to make the pieces work!
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Joined: Aug 2015
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I'm going through the same thing with my 740 is there a chance that you could fix me up with the site you got your Flow chart from so I can maybe get one and keep with my Volvo Books? Right now any info on what we are dealing with would be really cool to get a hold of. This one has got me stumped, and I always took pride in my Diagnostic ability. Being 61 retired and not doin it every day doesn't help the ol edge's isn't as sharp as it was.
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Volvo240Rookie
Volvo 240, 740 & 940
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Oct 15, 2010 07:48 AM
