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-   -   85 535i ECU/wire harness (http://www.bimmerfest.com/forums/showthread.php?t=672755)

stewnmo 01-27-2013 06:32 PM

85 535i ECU/wire harness
 
first; this is my first post. second; i did try searching first :dunno:. Here's the rub.....
bought 85 535i for first projet car (am learning as i go). it turns over, but no fire.
i have check all that i am aware of (fuses, relays, distributer, coil, position/speed sensors, etc.. now......
i have found voltage to the coil, but, no pulse from the coil (i would appreciate advice on where to go next). and i checked two pins on the ecu (18 & 35). as i understand, these should have power to them all the time. 18 does, 35 has power when the key is off and on accessory. when key is all the way to on....there is no power on pin 35. is this normal?
if yes, where to now,
if no, do i jumper main relay or trace wire for pin 35.......or something else. i am running out of searchable ideas.

catso 01-28-2013 09:00 AM

Before you get into that, confirm that you are getting spark and fuel.

stewnmo 01-28-2013 10:59 AM

there is no spark. that is the trail i am on now. the main relay clicks and contacts are clean, the relay socket has power to #30 and 86. the coil has power to it, but no pulse when turning over. position sensor and speed sensor both give good resistance readings.

catso 01-28-2013 01:07 PM

Did you check the condition of the rotor in the distributor? The coil to dist wire for corrosion? The condition of the raised pin on the flywheel that the CPS uses? The physical condition and positioning of all the sensors and their connectors? Was the engine running recently?

catso 01-28-2013 01:25 PM

If you want to check further for voltage to the main relay, etc. you should refer to the Bentley E28 manual. There are lots of detailed testing proceduces described in chapters 7 and 8.

catso 01-28-2013 06:43 PM

Quote:

Originally Posted by stewnmo (Post 7342211)
first; this is my first post. second; i did try searching first :dunno:. Here's the rub.....
bought 85 535i for first projet car (am learning as i go). it turns over, but no fire.
i have check all that i am aware of (fuses, relays, distributer, coil, position/speed sensors, etc.. now......
i have found voltage to the coil, but, no pulse from the coil (i would appreciate advice on where to go next). and i checked two pins on the ecu (18 & 35). as i understand, these should have power to them all the time. 18 does, 35 has power when the key is off and on accessory. when key is all the way to on....there is no power on pin 35. is this normal?
if yes, where to now,
if no, do i jumper main relay or trace wire for pin 35.......or something else. i am running out of searchable ideas.

You know, I'm now thinking that it may actually be as simple as a bad coil.:dunno:

stewnmo 01-28-2013 09:31 PM

i checked the resistance on the coil which was correct (i know that isnt %100, but for now i am avoiding throwing money at it).
i dont have a bently manual, i do have a haynes and an ETM which i am learning to read wire diagrams from.
i did check the condition of the wires, roter, distributor, contacts, etc; i did not check the pin for the cps (i keep forgetting). since i work full time and go to school full time i only have weekends. and now i have a new list. thank you and i will keep you informed. thank you.

stewnmo 02-03-2013 10:17 AM

ok, i have discovered that someone put the wrong main relay in. after confirming the diagram for the correct relay i jumpered the sockets and it started. thank you all very much for your help.

catso 02-03-2013 11:26 PM

Good going!


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