Ground loops and 730 ECM

[Ludis Langens]

Vinnie Moscaritolo wrote:
> 
> There is one thing though that concerns me, its the O2 sensor (Bosch
> 12014)  circuit.  Pin E5 of the 1227730 is called out as the O2
> sensor ground.  I noticed that in the 730 it goes to some kind of Op
> amp that reads the sensor, but is in fact isolated from ground.

Um, The O2 ground is E15, not E5

> so my question is how should I handle the 02 circuit? can I connect
> pin E5 to the ground bonding post (on my fiberglass firewall)  or
> should I run a line as close to the 02 sensor as possible?

Wire pin E15 as close to the O2 sensor as possible.  I've seen GM hook
this input to a bolt in the end of the cylinder head.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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