94 Lesabre-no start

[spfld03]

I am working on a 94 Lesabre, 3.8 liter,OBD2 that wil not start at any time. I tried a known good Ignition module, but didn't help. I checked fuel pressure-44lbs, and spark at coil-ok. I also removed spark plugs and checked for fuel-none. I put noid light on injector #1 and found no pulse. I have 12 volts, but no ground pulse. I don't have a wiring diagram, but do have a scan tool that shows where all the power and ground pins are on the ecm; I checked all and it seems to have everything going to that it should. Also ,I cannot get scan tool to communicate to retrieve codes or data. I believe I need a new ecm, but would like another opinion if someone wouldn't mind. Thanks for anyones
help ahead of time.

[stripe]

Originally Posted by spfld03

I am working on a 94 Lesabre, 3.8 liter,OBD2 that wil not start at any time. I tried a known good Ignition module, but didn't help. I checked fuel pressure-44lbs, and spark at coil-ok. I also removed spark plugs and checked for fuel-none. I put noid light on injector #1 and found no pulse. I have 12 volts, but no ground pulse. I don't have a wiring diagram, but do have a scan tool that shows where all the power and ground pins are on the ecm; I checked all and it seems to have everything going to that it should. Also ,I cannot get scan tool to communicate to retrieve codes or data. I believe I need a new ecm, but would like another opinion if someone wouldn't mind. Thanks for anyones
help ahead of time.

I thought obd2 was 96 or newer?

You sure it is the origional engine?

Cheers
Stripe

[spfld03]

Yes its OBD2, I checked the vin and it is 1994. I have seen a few 1995 GMs that were OBD2, but I believe this is the first 1994. Thanks.

[Jrs3800]

No, you do not have an OBD2 car...

This car is an OBD1 Compliant car using the OBD1 Protocol, but it uses the 16 Pin OBD2 connector and OBD2 codes.. This is a full OBD1 car..

It sounds a lot more like the crank sensor is bad.. Do you have spark?

Nevermind I see you do have spark... Hard to say but the Crank sensor still sits in my mind..

[HotZ28]

I put noid light on injector #1 and found no pulse.

Don, I think you missed this part of post #1 . He has found the problem but does not know what is causing it.

[Jrs3800]

Originally Posted by HotZ28

Don, I think you missed this part of post #1 . He has found the problem but does not know what is causing it.

Yeah I should be ashamed... Posting in Tiredness does no good.. lol

And I sure did miss that one..

Just Curious, what kind of scan tool was used on the car? Usually if the Tool is capable of reading the car and the PCM will not communicate that tends to be a bad sign for the PCM.. I can't say for certain this is your issue tho..

Have you checked the Injector Fuse?

[spfld03]

Thanks for the reply. I am using a MAC Mentor scan tool. I have also checked all fuses. Thanks.

[spfld03]

Thanks for the help, it was ecm. Replaced it and all is well.