ls6 wont start - sensors?
Thread Starter
Registered User
Joined: Aug 2012
Posts: 15
Likes: 0
ls6 wont start - sensors? so, i've got the ls6 from a 2002 zo6 in a 99 tahoe. the engine fires and runs for a few seconds then stops. i belive its a safety mechanism. possible some senor that it is looking for. so the question is what senors are a must to have hooked up in order for this to run? or is there something else im missing?
thanks
thanks
Did it run, previously?
If these are the first attempts to start it, after the swap, then I agree with the person above^.
If the 2002 VATS works similar to a 98/99, then I'll guess that the BCM was not carried forward to your Tahoe.
The BCM puts out a 30 or 50 cycle signal, which is detected by the ECM. Once this happens, the ECM allows fuel pulses to the injectors.
If this is the trouble, you can have the VATS function deleted from the ECM.
If these are the first attempts to start it, after the swap, then I agree with the person above^.
If the 2002 VATS works similar to a 98/99, then I'll guess that the BCM was not carried forward to your Tahoe.
The BCM puts out a 30 or 50 cycle signal, which is detected by the ECM. Once this happens, the ECM allows fuel pulses to the injectors.
If this is the trouble, you can have the VATS function deleted from the ECM.
Does sound like the VATS. However, regarding sensors, do you have the MAF hooked up?
Jon
PSI
Jon
PSI
__________________
Your Source for LSX Conversion Parts!
www.psiconversion.com
Ebay Store
Facebook/psiconversion
Instagram/psiconversion
'Dont Let EFI Pass You By!'
Your Source for LSX Conversion Parts!
www.psiconversion.com
Ebay Store
Facebook/psiconversion
Instagram/psiconversion
'Dont Let EFI Pass You By!'
Thread Starter
Registered User
Joined: Aug 2012
Posts: 15
Likes: 0
The junkyard I bought it from showed that it was running in the car before they pulled it and sent it to me. The 99 tahoe was the last year of that model, so the security might be old tech. It does have the resistor key but I can tune the ecu if I reprogram it anyway, just want to make sure that it is the prob.
As for sensors. I have the maf and O2 and the fuel pressure sensor hooked up.
As for sensors. I have the maf and O2 and the fuel pressure sensor hooked up.
I'd agree, sounds like VATS to me!
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Trending Topics
Thread Starter
Registered User
Joined: Aug 2012
Posts: 15
Likes: 0
ok, I got OBDII working and here are the codes:
P0452 - Evap Pressure Sensor / Low Input
P0453 - Evap Pressure Sensor / High
P1125 - Acc Pedal Pos System
P1516 - Command Vs Actual TP Perf (TAC Mod)
P1518 - PCM To TAC Mod Serial Data Circuit
P1639 - 5 volt Ref 2 circuit
The pedal is attached and working the throttle body so I'm not sure why that's there. I'm thinking I got the Fuel Pressure Switch connected wrong. But these codes aren't showing the VATS code that I have seen others saying is there when scanned?
P0452 - Evap Pressure Sensor / Low Input
P0453 - Evap Pressure Sensor / High
P1125 - Acc Pedal Pos System
P1516 - Command Vs Actual TP Perf (TAC Mod)
P1518 - PCM To TAC Mod Serial Data Circuit
P1639 - 5 volt Ref 2 circuit
The pedal is attached and working the throttle body so I'm not sure why that's there. I'm thinking I got the Fuel Pressure Switch connected wrong. But these codes aren't showing the VATS code that I have seen others saying is there when scanned?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote Thread Starter
Registered User
Joined: Aug 2012
Posts: 15
Likes: 0
Alright, I had the FTP sensor on the wrong wire. But now that I fixed that and reset the error codes, I'm left with only these two:
P1639 - 5 volt Ref 2 circuit
but this one doesn't make sense because it was in there twice and know it's only in there once:
P0452 - Evap Pressure Sensor / Low Input
So, I guess the 5 volt ref 2 circuit is the problem. I'm not sure where the wire goes. I can't find a 5 volt to connect it to???
P1639 - 5 volt Ref 2 circuit
but this one doesn't make sense because it was in there twice and know it's only in there once:
P0452 - Evap Pressure Sensor / Low Input
So, I guess the 5 volt ref 2 circuit is the problem. I'm not sure where the wire goes. I can't find a 5 volt to connect it to???
