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oil level sensor 3.4 dohc by bonaduce
Started on: 05-14-2014 11:47 AM
Replies: 7 (137 views)
Last post by: bonaduce on 05-16-2014 09:05 AM
bonaduce
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Report this Post05-14-2014 11:47 AM Click Here to See the Profile for bonaduceClick Here to Email bonaduceSend a Private Message to bonaduceEdit/Delete MessageReply w/QuoteDirect Link to This Post
Question for Darth or any one else who has done this swap. I want to hook this sensoor/switch up, according to ALLDATA it is a ground wire through D19 and a 12v lead through A4. Being the ecm (prom) has been "recoded" would this still be possible and run wires to a indicator lamp, or bypass the ecm completely and run my own power and ground wires to an indicator lamp.

thanks for any insight

Dan
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phonedawgz
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Report this Post05-14-2014 11:50 AM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
It's doubtful that the programming for the oil level light was altered if you are running a modified stock PCM. Of course if you are running something like a 7730 then the programming for it doesn't exist.

Not sure how the ECM outputs the low oil level indication. Just a light or through the BCM (if present)?
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Darth Fiero
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Report this Post05-14-2014 04:08 PM Click Here to See the Profile for Darth FieroClick Here to visit Darth Fiero's HomePageClick Here to Email Darth FieroSend a Private Message to Darth FieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
Dan, on the 1994-95 3.4 DOHC OBD1 PCM, the low oil level switch has two terminals. One connects to ground. The other connects to PCM terminal D19.

The PCM has an output to control a dash mounted low oil level warning light coming from pin A4. The PCM grounds this circuit to turn on the light, which means the other terminal of the light needs to get switched 12v + power (hot with key in run and crank).

If you have a 1991-93 3.4 DOHC PCM, there is no low oil level sensor/switch connection to that PCM.

-ryan

------------------
OVERKILL IS UNDERRATED

Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com

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bonaduce
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Report this Post05-15-2014 08:54 AM Click Here to See the Profile for bonaduceClick Here to Email bonaduceSend a Private Message to bonaduceEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks for the info guys, I did us the older ecm.

dan
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tesmith66
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Report this Post05-15-2014 12:27 PM Click Here to See the Profile for tesmith66Send a Private Message to tesmith66Edit/Delete MessageReply w/QuoteDirect Link to This Post
Can he simply run +12V to one side of the switch and run the other to a light? Or ground one side and run the other to a light that is on a +12V circuit (grounding the bulb like the ECM would)? Why does it go through the ECM? Is it on a buffered circuit to keep the light from flashing when the oil sloshes around?

Where is the sensor? I have a 94 parts motor, but don't recall seeing a sensor in the pan.

------------------
1986 SE Aero coupe.

3.4 DOHC swap is complete and running, now just have to finish the rest of the car...

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Darth Fiero
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Report this Post05-15-2014 04:37 PM Click Here to See the Profile for Darth FieroClick Here to visit Darth Fiero's HomePageClick Here to Email Darth FieroSend a Private Message to Darth FieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
He cannot simply connect the low oil level switch to a warning light directly because it is on a "buffered circuit" in the newer ECM that prevents the light from turning on as oil sloshes around as you correctly assumed, tesmith66.

[This message has been edited by Darth Fiero (edited 05-15-2014).]

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tesmith66
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Report this Post05-16-2014 06:52 AM Click Here to See the Profile for tesmith66Send a Private Message to tesmith66Edit/Delete MessageReply w/QuoteDirect Link to This Post
Wow, GM used a buffered circuit on that in 94, but on my 97 Grand Prix, the low windshield washer light would flicker like mad over bumps and always burn steady on LH turns. I finally disconnected the stupid thing.
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bonaduce
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Report this Post05-16-2014 09:05 AM Click Here to See the Profile for bonaduceClick Here to Email bonaduceSend a Private Message to bonaduceEdit/Delete MessageReply w/QuoteDirect Link to This Post
We have tried the direct wire approach, and yes the light was on continuesly, using a washer level sensor was suggested by one of the techs at work, but i don't think that would be feasable. So on to a plan B. thanks again for the insight and help

dan
 
quote
Originally posted by Darth Fiero:

He cannot simply connect the low oil level switch to a warning light directly because it is on a "buffered circuit" in the newer ECM that prevents the light from turning on as oil sloshes around as you correctly assumed, tesmith66.



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