twin74s

iTrader: (10)

Heres the scoop. 07 LY6 E38 ecm. Have Crank, Cam signal. Has spark. No injector pulse. VATS is disabled and car will run if you spray brake clean in the intake. My Modis scanner shows that it has injectors pulse. HP tuners shows injector pulse but i never get a noid signal. All injectors have power during cranking and key on.

Things im not sure of. Accessory wakeup serial data wire?
What does this do and what should it be hooked too?

With a volt meter hooked to power and to the ground side of the injector wire it will show ground with key on. Normal? But the ground will not light a test light.

Any help would be greatly appreciated.

THanks David

LS1MCSS

iTrader: (18)

Here is what I found on the accy serial data wire. Looks like it shouldn't have to be connected.

The accessory wake up line is an accessory fed power feed to the ECM and TCM (etc).

It is there in most cases to support "wake up" of low speed serial data when the key is on accessory, vs ignition on/engine running.

wait4me

iTrader: (10)

did you do a full flash after you killed the VATS?

twin74s

iTrader: (10)

I didnt do the tune myself. I had a local tuner do it. I will have to ask him.

sho-me speed

iTrader: (55)

Asked this question on another forum and I was under the impression that he had it redone.

twin74s

iTrader: (10)

It was a full flash. Im lost. Guess this thing is just destined to stay in the garage

buddyholly

Have you checked the fuel pressure at the rail? You are showing injector pulse while cranking? My LY6 cranked and ran from the first time I put power to it. I do not have the accessory wakeup wire connected.
I just cranked my L76 on my test stand over the weekend and it was pissy about cranking. It finally did, but it was difficult about it.
Do you know if you have your fuel pump set to "Fixed"? Seems like my LY6 was not and I had to change that setting.
Bounce some more ideas off me and I can check them against my LY6 setup.

twin74s

iTrader: (10)

starter enable wire.... Needs to see a ground? Took it to a friends shop and he came up with that and now it starts and runs. Did you have to do this also?

twin74s

iTrader: (10)

just read your truck swap and seen the starter check disable... Guessing that would make it so i dont have to ground that wire?

buddyholly

Yes, the starter check disabled kept me from having to run the ground wire...Great news, glad you got it running...

v10rodder

Don't know if you will be back online, but I just went through my LY6 startup today. Without your help it would have taken me days to wring it out. The grounding of the fuel pump relay and starter relay ECU pins were the last key issues.
Thanks much.
v10rodder

dropedss86

iTrader: (5)

thank you We where racking our brains out with the same stuff ripped apart the whole harness and then I found this post.

twin74s

iTrader: (10)

Glad to help, the info is here if you search for it

bpmathy

Found your thread, and it pointed me into the correct place after a week.ran the wire, no go, shot the Camshaft position no go, changed the disable engine crank, and off the beast went. cheers to all

71 GMC stepside LY6/6L90