...DIY CEL? & CAS question...

[jtgh]

yes, my 2 post above will prove body parts are good,

coil, inigitor and CMP.


always check spark at coil all by its self , first , never at spark plugs.
as this can doing latter can send us , off chasing tail.

Lets , get some spark going!

cheear

[ecoast]

Code 42 now w/key on (not necessarily cranking).

Yet, when I cut the dizzy loose (literally, but for the black ground) and did the 12v LED test like on the bench in your video, and it flashes while I crank, so SEEMS to test OK...?
Why do you think it static tests ok, but ECU sees 42?

...this is the part that's throwing me off as it 'seems' to test ok
...although 42 is what it spat out before repair also.

(still, we don't know if ECU is functioning properly; b-up unit arrives tomorrow/Sat.but who knows, again?)?


Is the CAS a separate part, or do I need to find a dizzy?
Anything else I should do before spending $$$?



Anybody reading this in the NY metro area have any extra parts?

[ecoast]

just did the ignitor test from the 'no spark' page and got a nice spark !

So- coil and ignitor are good?

Does this also tell me suppressor and spark back EMF are functioning ?

That will leave me to swap in 2nd ECU, and if still no spark, most likely dizzy/CAS?

[jtgh]

ok , cut out dizzy (cept grnd) passes, good, says dizzy is working (CMP)
you did the 150ohm ignitor test, it passes , hurray ! very good. !!!
nice to see spark .

just because there is spark dont mean the read back is correct.
the suppressor must not be wired backwards, !! ask how to tell.
i cant ,say because dont know your colors. of wires.

the 42 is , real or it is because you cranked with dizzy pulled. (if connected and get 42 , dizzy is bad)
if you do that , it stores this in memory.
pull dome fuse ( or frankenkkick equivalency, crank 10 times,
with diag jump installed.
see if it sets 42.

if car sets 42.
Dizzy is bad.
dizzy wired in wrong.
wrong dizzy pn or year. 89 and 90 dizzy is illegal on any xxxxx56B30/40 ecu.
bad ecu ( i dont believe it but could be)


you do have 56b30 right? ECU ? PN on top, next to US MT or US AT sticker.
so dizzy will be marked 56b10 for 91.
dizzy marked 60a20/40 is 89/90 junk, do not use this.

[ecoast]

Originally Posted by jtgh

ok , cut out dizzy (cept grnd) passes, good, says dizzy is working (CMP)
you did the 150ohm ignitor test, it passes , hurray ! very good. !!!
nice to see spark .

just because there is spark dont mean the read back is correct.
the suppressor must not be wired backwards, !! ask how to tell.
i cant ,say because dont know your colors. of wires.

I will peel back harness and check.

Originally Posted by jtgh

the 42 is , real or it is because you cranked with dizzy pulled. (if connected and get 42 , dizzy is bad)
if you do that , it stores this in memory.
pull dome fuse ( or frankenkkick equivalency, crank 10 times,
with diag jump installed.
see if it sets 42.

if car sets 42.
Dizzy is bad.
dizzy wired in wrong.
wrong dizzy pn or year. 89 and 90 dizzy is illegal on any xxxxx56B30/40 ecu.
bad ecu ( i dont believe it but could be)

Code 42 while all connected same results after several ECU resets.
Dizzy #33100-56B1
Wiring seems to be correct.

Originally Posted by jtgh

you do have 56b30 right? ECU ? PN on top, next to US MT or US AT sticker.
so dizzy will be marked 56b10 for 91.
dizzy marked 60a20/40 is 89/90 junk, do not use this.

ECU is 56B30 MT US, as is the 2nd I'm expecting.

So it is all pointing to CAS/Dizzy?

....does $36 shipped to me sound good for a dist.?

[jtgh]

steal.
i can sell you one too , if need be. just havent had time to ebay it, up.

42 dont lie, it sure dont. !
the ecu will throw that for 1 missed TDC out of 6.

the ECU creates a virtual crank shaft.
it then synchronizes THIS, to the CMP real. Virtual is sync'd to reality.
it does this because it must anticipate timing advance in advance. no other way to do it.

if you miss 1 pulse , ok, if you miss 2 at any time , bingo 42. (approx, but no matter, it is dropping out !)

so this signal is:
weak or it is ,
intermittent

no , if, buts, besides,....????

bottom line.
bad ECU input on CMP pin. (rare as hens teeth never heard or seen it ever)
bad DIzzy , rare but happens.


42 dont lie. follow that lead , like a lazer beam, and this will correct the problem.

[ecoast]

2nd ECU showed up; same code 42 !

Hit a BIN on eBay for $20 shipped dizzy. - even better.



SO- Why does the CAS seem to static test ok (in your humble opinion)?
That, to me, is the interesting bit.

Perhaps we will have to see, that, in fact, the CAS is bad in this dizzy 1st.

Should have dist. in a couple of days.
thanks again for your support.

[jtgh]

the light tests , can pass , ( you mean that right , using led passes)

the transistor can be leaking and still wiggle as a transistor but because it does not turn completely off , it will fail.

a real scope photo of it pulsing would show that , while cranking.

meters, and leds can only catch the gross fails, not the wounded.


42 means , gross fail, or drop outs, or marginal fails.
which it is , who knows.?
you can see my scope photos of it making a perfect square wave.

yours isnt.

bad dizzy ,bad wires, bad ecu. scratch ECU.

i bet wires first cuz frankenkick.

[ecoast]

OK, I see...works good enough to trip a LED, but could still have signal fault w/regard to ECU.

So looks like it's gonna be harness or CAS...

Swap dizzy next week; I'll update post.

Thanks.

[jtgh]

yes,
the output of all 91 plus distributors is a single transitor.

the can be blow open, they can short. and if real unlucky they can leak. or be weak.

this causes the output to be not low enough or going high enough.

the signal must have valid levels and shape.

this would be a very rair failure, , the problem could be deeper in side the hall detector section and it is sick.
there are only 3 things at play.
CMP, ECU and the wiring between. ( I can only assume power is good and proper to all)