Checking Engine Coolant Sensor, '89 740

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Kirk Grau - 13 Jan 2005 18:02 GMT

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

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Mike F - 14 Jan 2005 13:33 GMT

> 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.
[quoted text clipped - 6 lines]
>
> 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.

Signature

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.)

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Kirk Grau - 15 Jan 2005 18:57 GMT

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

> > 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.
[quoted text clipped - 15 lines]
> Also, make sure that the info on the brickboard applies to your car, and
> not some other one with a different fuel system.

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Mike F - 17 Jan 2005 13:44 GMT

> 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.)

Signature

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.)

Reply to this Message