Reply
 
Thread Tools Search this Thread
 
Old 21 July 2012, 15:30   #1
Member
 
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 896
Strange wires from CD unit M90A

When checking the choke solenoid today, noted 2 dead end wires coming out of the cd unit. Black with yellow stripes (B/W). Here the diagram. CD unit is number 2 on the picture page 99.
According to that 2 B/W wires comes out of the CD unit but are connected together(?) Well, mine are not(just loose) but engine runs fine?

Anyone here have any ideas what is the function of those two wires and why they shold be connected? If following the diagram I should connect those two(i guess) but on the other hand, maybe not before knowing the function....
Attached Thumbnails
Click image for larger version

Name:	cd unit.jpg
Views:	136
Size:	91.1 KB
ID:	70450  
__________________

__________________
fun on a boat is inversely proportional to size...sort of anyway
C-NUMB is offline   Reply With Quote
Old 22 July 2012, 04:23   #2
Member
 
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 896
Think I have the explanation for the B/Y wires. Found following on the web:
"This wire is short with a pull apart connector that comes out of and goes back into the CDI unit. If you pull apart the connector to open the connection it will disable all the engine safety functions and you can test if the engine will run over half speed for a short time"

So if You want to have the alarm/safety features in operation, better keep them connected.
__________________

__________________
fun on a boat is inversely proportional to size...sort of anyway
C-NUMB is offline   Reply With Quote
Old 22 July 2012, 05:27   #3
RIBnet supporter
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 7,584
RIBase
I wonder if it's part of a stop circuit. E.g, if the ECU/EMM gets a fault, say overheat, it shuts down the CD unit. The 2 wires you have could be to override this for fault finding. Opening them would have no affect until the engine had a fault & tried to shut down or go into "limp" mode, which it wouldn't be able to do if the wires were open. Just a thought.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5
Pikey Dave is offline   Reply With Quote
Old 22 July 2012, 07:04   #4
Member
 
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 896
Quote:
Originally Posted by Pikey Dave View Post
I wonder if it's part of a stop circuit. E.g, if the ECU/EMM gets a fault, say overheat, it shuts down the CD unit. The 2 wires you have could be to override this for fault finding. Opening them would have no affect until the engine had a fault & tried to shut down or go into "limp" mode, which it wouldn't be able to do if the wires were open. Just a thought.
I guess this is the case. Think will buy the factory service manual used or new, it seams to be pretty simple engine probably, possible to fix most things basis "DIY"
__________________
fun on a boat is inversely proportional to size...sort of anyway
C-NUMB is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Member's RIBs

Rib

michael1

MI9

MI9
Add your RIB



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 06:54.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.