2007 LS 5.3L no start...... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tk-mpl · 03-14-2010, 02:57 PM

Well everything is in and wired. I have no spark and no noid.... I wired the starter relay enable right off of the ign. switch so it does turn over. We disabled the passlock (vats) with EFI Live. I have crank signal, you can watch the rpm on efi scan tool......
I have power and ground at coil with key on and while cranking. Also have power at injector....

could use some help...
Trevor

clinebarger · 03-14-2010, 03:38 PM

Did your engine come out of a silverado classic or a silverado (old or new body style)?

The reason I ask is because the new silverados have a gen IV 5.3.

tk-mpl · 03-14-2010, 03:43 PM

It is out of a new body style tahoe. It is a 5.3L LMG..

clinebarger · 03-14-2010, 04:14 PM

Are the cam & crank sensors plugged in? Have you checked all the grounds coming out of the harness? Im guessing there are no codes?

Ive always sent my computers out for VATS, how are you sure you flashed the PCM correctly?

When i have VATS problems they start for a couple seconds and die, but not sure on the gen IV controller.

Who modified the harness? Are you using the stock harness and PCM?

Was the doner truck in a wreak, damaged harness? Damaged sensors?

tk-mpl · 03-14-2010, 04:18 PM

I am kind of wondering because the PCM isn't seeing a crank request that it isn't enerrgizing the coils or injectors...

tk-mpl · 03-14-2010, 04:20 PM

I can watch the rpm with efi while cranking and cam phasing counts aswell.

blazerboy72 · 03-14-2010, 04:38 PM

Is the gas pedal plugged in? Mine was doing the same thing and the plug on the pedal wasn't all the way in.

clinebarger · 03-14-2010, 04:41 PM

Quote:

Originally Posted by tk-mpl

I am kind of wondering because the PCM isn't seeing a crank request that it isn't enerrgizing the coils or injectors...

Without a body contol module it will not see a crank request.When the ignition switch is placed in the Start position, a discrete 12-volt signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The BCM then sends a message to the engine control module (ECM) notifying it that CRANK has been requested. The ECM verifies that the transmission is in Park or Neutral. If it is, the ECM then supplies 12 volts to the control circuit of the crank relay.

This should not keep the engine from starting.

You didnt answer the questions i asked? I can not help you without more information.

tk-mpl · 03-14-2010, 04:51 PM

Quote:

Originally Posted by clinebarger

Are the cam & crank sensors plugged in? Have you checked all the grounds coming out of the harness? Im guessing there are no codes?

I checked all powers and grounds to pcm and all other grounds that were on the harness.

Ive always sent my computers out for VATS, how are you sure you flashed the PCM correctly?
Not sure on the reflash as a friend came over and did it..

When i have VATS problems they start for a couple seconds and die, but not sure on the gen IV controller.
No start at all because have no spark and no injector pulse..

Who modified the harness? Are you using the stock harness and PCM?

I am using a stock modified harness by me..

Was the doner truck in a wreak, damaged harness? Damaged sensors?

asfar as I can tell all needed sensors for starting are working.. Did not see any defects while rewiring.

tk-mpl · 03-14-2010, 04:55 PM

I know how the starter circuit worked, that is why I wired the starter relay off of the ign. switch.. I thought with all powers and grounds and then sensor inputs while cranking it would start.
Guess not....

tk-mpl · 03-14-2010, 05:01 PM

pedal is plugged in..

ShredSled · 03-14-2010, 05:09 PM

shot in the dark, but does it have anything to do with the GenIV higher resolution reluctor wheel?

clinebarger · 03-14-2010, 05:11 PM

Quote:

Originally Posted by tk-mpl

I know how the starter circuit worked, that is why I wired the starter relay off of the ign. switch.. I thought with all powers and grounds and then sensor inputs while cranking it would start.
Guess not....

I agree it should.

No codes right?

Has your buddy ever flashed a 07 before?

clinebarger · 03-14-2010, 05:16 PM

Quote:

Originally Posted by ShredSled

shot in the dark, but does it have anything to do with the GenIV higher resolution reluctor wheel?

The 58x crank sensor should not be a problem aslong as he is using the correct PCM.

tk-mpl · 03-14-2010, 05:20 PM

The only codes that have set are EVAP crap I haven't deleted yet and p0615 and p0690.

Ted's experience with EFI is mostly with diesel stuff, but he knew exactly how to turn vats off..

killer71 · 03-14-2010, 05:37 PM

put gas in it...just kiddin, pm short step!

clinebarger · 03-14-2010, 05:43 PM

Quote:

Originally Posted by tk-mpl

The only codes that have set are EVAP crap I haven't deleted yet and p0615 and p0690.

Ted's experience with EFI is mostly with diesel stuff, but he knew exactly how to turn vats off..

DTC P0615

The engine control module (ECM) supplies 12 volts to the control circuit of the STRTR relay when start enable has been requested. The ECM monitors this circuit for conditions that are incorrect for the commanded state. If the ECM detects an improper circuit condition, STRTR relay DTC P0615 will set.

The ECM detects an improper voltage level on the control circuit that controls the STRTR relay.

Ignition system DTCs set with the ignition switch in the START position if the STRTR relay or the starter is inoperative. When the ECM enables starter operation, the ECM also initiates the diagnostic test routines for other DTCs. If a condition exists which prevents the engine from cranking, the ECM will not receive signal input from the crankshaft position (CKP) and camshaft position (CMP) sensors, and the DTCs will set.

DTC P0690
The ECM detects more than 16 volts on the ignition 1 voltage circuit to the ECM when the relay is commanded ON.
The ECM detects more than 2 volts on the ignition 1 voltage circuit to the ECM when the relay is commanded OFF.

tk-mpl · 03-14-2010, 05:52 PM

do you think if I turn that code off (p0615) with efi that it would help??

clinebarger · 03-14-2010, 06:08 PM

Quote:

Originally Posted by tk-mpl

do you think if I turn that code off (p0615) with efi that it would help??

It whouldnt hurt.

Ackattack · 03-14-2010, 06:25 PM

do you have power to the ECM while you're cranking?

I hooked up a TPI engine and fought with it for a day or two until I realized that I didn't have power to the ECM while cranking, but did have power in the "on" position. Good luck, it can get frustrating in a hurry when it "should" work.

Might want to check out the "hybrid" section at LS1tech.com and see if someone there can give you some insight too.

tk-mpl · 03-14-2010, 06:39 PM

I got posts on hear, efi live forum and ls1tech..
power is there while cranking..

tk-mpl · 03-14-2010, 07:00 PM

Not sure how much you guys know about this system, but the pcm isn't even enabling the powertrain relay which powers the coils, injectors, o2 sensors, and MAF sensor. I wired it differently with a current performance fuse block, but that circuit should have 12V with key on..

sorry it grounds the relay and it is there..

Ackattack · 03-15-2010, 02:08 AM

I used a current performance fuse block too.

Do you have any way of testing the ECM.

I fried one ECM. I took it out of my 68 and put it in my 05 and had the same issue in the 05 so I knew it wasn't the wiring or anything else, only the ECM. If it works in an 07, then you know it's something with your wiring.

Sub71 · 03-15-2010, 09:20 AM

Double check your grounds and connections.

I pulled the power steering pump off one time and forgot to hook a ground back up there and it wouldn't start. It won't start without the alternator plugged in as well.

I built my own harness as well, did you ground all the black wires?

tk-mpl · 03-15-2010, 02:05 PM

I got to leave today for work, but when I am home next week I should pull my 08 pcm out and see if it will work.... I really thing it is a crank request issue though..
Trevor

03-14-2010, 02:57 PM	#1
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	2007 LS 5.3L no start...... Well everything is in and wired. I have no spark and no noid.... I wired the starter relay enable right off of the ign. switch so it does turn over. We disabled the passlock (vats) with EFI Live. I have crank signal, you can watch the rpm on efi scan tool...... I have power and ground at coil with key on and while cranking. Also have power at injector.... could use some help... Trevor __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

03-14-2010, 03:38 PM	#2
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: 2007 LS 5.3L no start...... Did your engine come out of a silverado classic or a silverado (old or new body style)? The reason I ask is because the new silverados have a gen IV 5.3.

03-14-2010, 03:43 PM	#3
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... It is out of a new body style tahoe. It is a 5.3L LMG.. __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

03-14-2010, 04:14 PM	#4
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: 2007 LS 5.3L no start...... Are the cam & crank sensors plugged in? Have you checked all the grounds coming out of the harness? Im guessing there are no codes? Ive always sent my computers out for VATS, how are you sure you flashed the PCM correctly? When i have VATS problems they start for a couple seconds and die, but not sure on the gen IV controller. Who modified the harness? Are you using the stock harness and PCM? Was the doner truck in a wreak, damaged harness? Damaged sensors? Last edited by clinebarger; 03-14-2010 at 04:15 PM.

03-14-2010, 04:18 PM	#5
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... I am kind of wondering because the PCM isn't seeing a crank request that it isn't enerrgizing the coils or injectors... __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

03-14-2010, 04:20 PM	#6
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... I can watch the rpm with efi while cranking and cam phasing counts aswell. __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

03-14-2010, 04:38 PM	#7
blazerboy72 Senior Member Join Date: Mar 2002 Location: Temple, Ga Posts: 854	Re: 2007 LS 5.3L no start...... Is the gas pedal plugged in? Mine was doing the same thing and the plug on the pedal wasn't all the way in.

03-14-2010, 04:55 PM	#10
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... I know how the starter circuit worked, that is why I wired the starter relay off of the ign. switch.. I thought with all powers and grounds and then sensor inputs while cranking it would start. Guess not.... __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

03-14-2010, 05:01 PM	#11
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... pedal is plugged in.. __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

03-14-2010, 05:09 PM	#12
ShredSled Registered User Join Date: Mar 2010 Location: Michigan Posts: 159	Re: 2007 LS 5.3L no start...... shot in the dark, but does it have anything to do with the GenIV higher resolution reluctor wheel? __________________ get it!

03-14-2010, 05:20 PM	#15
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... The only codes that have set are EVAP crap I haven't deleted yet and p0615 and p0690. Ted's experience with EFI is mostly with diesel stuff, but he knew exactly how to turn vats off.. __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

03-14-2010, 05:37 PM	#16
killer71 Registered User Join Date: May 2006 Location: at work Posts: 2,552	Re: 2007 LS 5.3L no start...... put gas in it...just kiddin, pm short step! __________________ R.I.P. Killer 71 10/26/07

03-14-2010, 05:52 PM	#18
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... do you think if I turn that code off (p0615) with efi that it would help?? __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

03-14-2010, 06:25 PM	#20
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,524	Re: 2007 LS 5.3L no start...... do you have power to the ECM while you're cranking? I hooked up a TPI engine and fought with it for a day or two until I realized that I didn't have power to the ECM while cranking, but did have power in the "on" position. Good luck, it can get frustrating in a hurry when it "should" work. Might want to check out the "hybrid" section at LS1tech.com and see if someone there can give you some insight too. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

03-14-2010, 06:39 PM	#21
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... I got posts on hear, efi live forum and ls1tech.. power is there while cranking.. __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.



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03-14-2010, 07:00 PM	#22
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... Not sure how much you guys know about this system, but the pcm isn't even enabling the powertrain relay which powers the coils, injectors, o2 sensors, and MAF sensor. I wired it differently with a current performance fuse block, but that circuit should have 12V with key on.. sorry it grounds the relay and it is there.. __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust. Last edited by tk-mpl; 03-14-2010 at 07:04 PM.

03-15-2010, 02:08 AM	#23
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,524	Re: 2007 LS 5.3L no start...... I used a current performance fuse block too. Do you have any way of testing the ECM. I fried one ECM. I took it out of my 68 and put it in my 05 and had the same issue in the 05 so I knew it wasn't the wiring or anything else, only the ECM. If it works in an 07, then you know it's something with your wiring. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

03-15-2010, 09:20 AM	#24
Sub71 Registered User Join Date: Dec 2009 Location: Conroe TX Posts: 77	Re: 2007 LS 5.3L no start...... Double check your grounds and connections. I pulled the power steering pump off one time and forgot to hook a ground back up there and it wouldn't start. It won't start without the alternator plugged in as well. I built my own harness as well, did you ground all the black wires?

03-15-2010, 02:05 PM	#25
tk-mpl Registered User Join Date: Jan 2008 Location: Lacombe, Alberta Posts: 353	Re: 2007 LS 5.3L no start...... I got to leave today for work, but when I am home next week I should pull my 08 pcm out and see if it will work.... I really thing it is a crank request issue though.. Trevor __________________ 1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust.

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