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#1
11-06-2012, 09:57 AM
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No power to CIS? 1991 560SEL
It seems my 560 is running fully mechanical as my multimeter shows no power at any of the electronic inputs... the flapper potentiometer, cold start injector, EHA, etc and idling high. I can only change idle via CO screw.
These CIS ECUs seem to be pretty durable, has anyone experienced a dead one before? Any definitive test I can run to see? Thanks
__________________
I'm not a doctor, but I'll have a look.  '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] 
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#2
11-06-2012, 10:05 AM
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You have power from the over-voltage relay to the CIS control unit & a good ground?
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
11-06-2012, 10:06 AM
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Quote:
Battery ground or CIS system ground?
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#4
11-06-2012, 09:50 PM
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Use battery as ground point. Disconnect ECU and probe (peep FSM for pin) and see if you've got power there. If not, trace it backwards, I believe OVP or MAS might be a provider or at least wired in parallel.
I know Mike had a problem with that big ass connector behind the fuse box. One of the pins would lose contact and drop out all the electronics.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#5
11-07-2012, 08:21 AM
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Do you have 12V power to the CIS control unit? Pin # 1
And a good ground at that unit as well? Pin # 20
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#6
11-27-2012, 03:38 PM
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Does anyone know which way the pins start? i.e. which corner is Pin 1?
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#7
12-13-2012, 04:29 PM
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Okay found the pin out, will scan later. I have 12V @ Pin 1 and a good ground to Pin 20.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#8
12-13-2012, 05:30 PM
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I think I know where this is headed.
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#9
12-13-2012, 05:32 PM
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Quote:
More hair pulling and another CIS unit?
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#10
12-13-2012, 05:39 PM
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Would be nice to have a sub to try to be sure, but in a case like this I can't imagine it's not. You can try giving the ecu a whack with a rubber mallet, if that helps.
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#11
12-13-2012, 11:09 PM
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I think my buddy Mike might have a spare 560 ecu out of his MY90 parts car. Not sure on part number.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#12
12-14-2012, 08:29 AM
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Something like that would be nice, at least if he would let him borrow it. Of course these aren't vin specific like they are now with all the coding and locking and "marrying", so he could possibly find a used one, but nice to confirm before ordering one up.
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#13
12-14-2012, 08:31 AM
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Quick ebay search found one for $145, generally they seem to be on there for $200ish
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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