Checking Engine Coolant Sensor, '89 740

OK, after posting about 2 weeks ago about my 740 running very rich, belching
black smoke, etc. I had a suggestion to look at the engine coolant sensor.
Found this site (http://www.swedishbricks.net/700900FAQ/EngineSensors1.html)
with some pretty good info on diagnosing engine coolant sensors. My problem
is I don't know where or how to get to terminals 13 and 5 referenced in the
site. Can anybody send me in the right direction?

Thanks,

Kirk

 

They would be talking about the pin numbers on the connection to the
fuel control unit. If you remove the electrical connector from the
control unit, then remove the connector's outer shell (you need to cut a
wire tie, move a boot and undo a small screw), you'll see pin numbers.
Do not probe the front side of the connector, test leads can bend the
terminals and then you end up with more problems than you started with.
Also, make sure that the info on the brickboard applies to your car, and
not some other one with a different fuel system.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 

Is this the ECU at the passenger side foot well or is there another
controller somewhere? Thanks for the continued help, I need it.

Kirk

 

Yes, that's where it is. (Also there's an ignition control unit located
above the kick panel over the driver's feet.)

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)