Need SI information

Timothy Owner/Technician Wisconsin Posted   Latest  
Resolved
Driveability
2006 Pontiac GTO 6.0L (U LS2) 6-spd (T56)
No Crank / No Start

Vehicle was in a rollover. Insurance totaled the vehicle. Owner bought it back, for the Powertrain (engine and manual trans), and will junk the carcass. Only 34K on the powertrain.

Shop wants me to get it cranking, so they can at least see if it's viable. I advised them just to jump the starter relay, and check static compression…but, they want to see if there's anything else wrong?

Even though I'm feeling I am not getting the whole story, if they want to pay, I'm game, so I dive in.

The engine control relay is not turning on. Diagram states that the EC relay is hot in start or run…one minor issue: where is the power source for the power? Another relay? Or, the ignition switch? Couldn't find the source in AD, or IDFix. So, three different sources for the diagram, and nothing?

Anyone got a clue as to where the power supply for the EC Relay is coming from…?

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William Technician
Illinois
William
 

In order back tracking to the B+

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Helpful
Timothy Owner/Technician
Wisconsin
Timothy
 

Thanks for the info…apparently, I didn't dig far enough, as I had looked at those same diagrams, except for the second one, showing the EC Relay powered live all the time. My bad. Sometimes it takes more than one person to catch it.

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Glenn Owner/Technician
Texas
Glenn
 

Hi Timothy, Being that it was a roll over, I would advise pulling the plugs before cranking it over. It's too easy to have a Hydro lock condition and bend a rod by trying to crank it with the plugs in it. From there a basic compression test should verify engine integrity before going too far. A starter trigger switch at the starter should suffice for testing purposes. I am guessing the engine…

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Agree
Timothy Owner/Technician
Wisconsin
Timothy
 

Did you read the post Glenn? I stated the exact same thing, that a simple compression test with the starter relay jumped would do a basic test, as far as engine integrity goes. You can't do a real compression test with the plugs in it Glenn… I further explained that they wanted to know if it would run at all…what they do after I diagnose the no crank is on them.

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Glenn Owner/Technician
Texas
Glenn
 

Hi Timothy, Yep, I actually made it past the title and offered my thoughts addressing the vehicle condition described. How many times have people been pulled astray by an erroneous title? You did not address the title (purpose of the request) until the 2/3rds the content.

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Timothy Owner/Technician
Wisconsin
Timothy
 

Did not ask for diag. Glenn, but for SI. You do have a tendency to go a bit astray in your responses Glenn. “ did not address the …until ⅔ the content”. Please try to read the whole post before commenting.

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Glenn Owner/Technician
Texas
Glenn
 

Then express that in your first sentence to support the title. (Just an honest observation). You are sharp tech and help a lot of people. I am not out to push up your blood pressure.

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Timothy Owner/Technician
Wisconsin
Timothy
 

You can observe all you like, but please read the entire post. I know it was really long, about 80 words to get to my request, so you may want to lengthen your attention span.

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Unprofessional
Glenn Owner/Technician
Texas
Glenn
 

Never miss an opportunity.

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Todd Diagnostician
Michigan
Todd
 

The engine control relay is fed by the 60 amp ENGINE fuse in the under hood fuse block.

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Timothy Owner/Technician
Wisconsin
Timothy Resolution
 

Thanks for the replies guys. That was just the info I was looking for. EC relay is constant B+ fed on this.

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