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  #1  
Old 11-06-2012, 09:57 AM
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Thumbs up 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

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'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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  #2  
Old 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?
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  #3  
Old 11-06-2012, 10:06 AM
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Thumbs up

Quote:
Originally Posted by mbdoc View Post
You have power from the over-voltage relay to the CIS control unit & a good ground?


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  
Old 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.
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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  
Old 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
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  #6  
Old 11-27-2012, 03:38 PM
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Thumbs up

Does anyone know which way the pins start? i.e. which corner is Pin 1?
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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  
Old 12-13-2012, 04:29 PM
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Exclamation

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  
Old 12-13-2012, 05:30 PM
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I think I know where this is headed.
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  #9  
Old 12-13-2012, 05:32 PM
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Question

Quote:
Originally Posted by Gilly View Post
I think I know where this is headed.


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  
Old 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.
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  #11  
Old 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  
Old 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.
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  #13  
Old 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
Mercedes 126 107 560SL 560SEL 560SEC Engine Control Unit ECU ECM Module Computer | eBay

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