no spark no injector pulse please help!!!

I am ready to start my 89 c1500 -00 5.3 4l60e conversion. I have no fire ,no injector pulse and the code reader shows no MIL. I have triple checked the grounds made sure the pcm has constant voltage. What am I missing? Jim

Failed to have the VATS disabled in the PCM? Connected the Cam sensor at the back of the block top center? Connected the crank sensor above and behind the starter.

Yes, I plugged in the cam sensor and the crankshaft sensor. I wish it could have been that simple that way I could feel stupid for only a little while, while the truck was running. HAHA Jim

What about the VATS? Has it been disabled in the PCM tune?

I would assume it was .I can't get ahold of the guy that did my harness/pcm. Yes I know what happens when I assume. Would the VATS keep it from firing and fueling? Jim

Yep, that's it job. You don't want to give fuel and fire to the guy stealing your truck. A cut or pinched wire from the cam sensor or crank sensor will keep it from firing, too. Don't ask me how I know. :laugh:

The coils and injectors should have a +12 volts with the key on and the PCM pulses the ground. You might check for the +12 to ground at the connectors. I think the wire color is pink.

I do have 12 volts at the coil terminals and at the injector terminals. I checked the grounds at the pcm also. Jim

its odd it doesn't bust off for a second then die. Make sure the wires going to the cam and crank sensors didnt get pinched between or cut by something. Do you have fuel pressure at the rails?

56psi at the rails.The guy that did my wiring and flashed my pcm said the all work done flashing is with all connectors in placeand tested that way. Is that common? how much do most charge for flashig a pcm

thats bullcrap IMO. You can't test a PCM without putting it on an engine and seeing if it runs or not. Bad burns happen all the time. Who is your tuner?

are you sure you have your switched hot(pink) hot in start and run, not just run, have seeen that and they will not start period if that is the case

Quote:

---

Originally Posted by oldcarstulsa

are you sure you have your switched hot(pink) hot in start and run, not just run, have seeen that and they will not start period if that is the case

---

Good point, I had not thought of that one.

That the first thing I checked. My 68 pontiac had that problem took a little while to trace it down. The ingition switch has one hot key on and another hot in run only. I reckecked all my power wires today. Jim

Try the PCM in a vehicle it was designed for and see if it works. I bet it won't.

My truck has a 5.3 silverado engine/trans. When it came back the pcm had hand written on it 6 speed 00 ls1. I thougt that was trouble when I saw it, but my thinking was it would be flashed anyway so it could work, right? I need a PCM don't I? Jim

Something sounds suspect. You know someone with a 5.3/60e? See if you can trade out PCMs for a moment to test it out.

would the pcm out of my 6.0 pontiac work? it has the drive by wire and a 80le I thought about changing it in yesterday. The model is an 01 I think out of a 2500 sub that I bought at the salvage sale I use. Jim

Would the truck run with a stock tune?if so I may just pick up a pcm today when I go to Little Rock to buy trucks. Jim

Nope, the PCM has to be tuned for a 99-02 year model and have the red and blue connectors like yours. It will need to have the VATS disabled or it will not run more than a few seconds at most. Mine would not start, just like yours, with the VATS still enabled.

If you're constantly messing with GM late model vehicles, you might consider buying HPTuners software/hardware so you can disable the VATS in that tune plus tune all the 98+ GM vehicles. Damn good deal for $500. For the price you can tune up to 4 vehicles and then purchase additional credits to modify unlimited newer vehicles.

I put the pcm off of my 6.0 pontiac, no spark no injector pulse. Jim.

No big surprise there. That's a whole different PCM there. looks the same and has the same connections but it is totally different logically in the program. Are the color codes on the PCM red and blue or are they green and blue? They color code them so you know if you have the correct pcm to match the wiring harness. Also, the GTO pcm will have VATS active in it, too.

Red and blue connections. The 6.0 is out of a 01 chevvy suburban 3/4 ton. I have had the pontiac running and driving so I know the VATS is disabled. Would a tec 2 scan tool at the dealer tell if the VATS is keeping me from starting? I can get the tec guy to come to my shop with the tec2. Jim

The vats disables by the key and body control module in the GTO. Not familiar with TechII but I'm sure it will tell you or might even be able to disable the VATS for you.

There is no BCM in my pontiac. It is a 68 convertible that I put in a 6.0 4l80e out of a 01 2500 suburban. It has a four wire hook up very similar to the one I am using on my truck.

Oh, I see. Thought you had a late model GTO for a minute there. Did you try the new PCM in the Pontiac?

No, I didn't think of that. My head is getting fuzzy and my eyes are getting blurry from looking at this truck. I am to close to the problem to see it now. Have you ever been there? I have an 03 silverado coming in that I bought at the sale on tuesday, that is needing the front sheetmetal. I am looking forward to building this truck and get away from this old 89. Jim

But, I still would like to get it runnig . Any body got any ideas?? I am about willig to check anythig. Jim

Swap the cam and crank sensors out with the ones from the running truck.

Allready done that. I want to thank you red, for your help in this. Jim

No problem. What all have you tried?

Lets see, I have changed the crankshaft sensor, the camshaft sensor. I have chaked the grounds at the pcm and the block. I have changed the pcm from my other car.I have checked for battery voltage at the pcm, I checked voltage at the ignition feed. I have checked for voltage at the injectors and coils. I have checked rail pressure [56psi] I put on a code reader, no MIL showing. There is more but that is all I recall right now. Jim

First thing to verify is that the VATS is disabled in the PCM. All other stuff is really moot until this is verified.

Check for a complete ground circuit from black wires in PCM connection, probe black wires at PCM connections to the engine block. Black grounding lugs for PCM ground should connect to the rear of the driver side head.

12V constant power at PCM connection on larger gauge red wires.

12V power on only when switched on in the PCM connectors, orange wires.

Continuity through PCM end to sensor end of wires going to crank and cam sensors.

Battery should be grounded directly to the engine block.

I'll add more if I think of it. These basic things should give you fire unless your timing chain is broken or someone put an LS2/LS7 cam in your engine (no pulse generator manufactured on the cam blank).

The fuel pump does'nt run during cranking. That means crank sensor or crank sensor curcuit. Right? Jim

The fuel pump should run for about 2 seconds when you turn the ignition on. It should be triggered by the PCM. The FP will be powered off if it does not recieve a valid VATS signal or crank signal.

PM or post your email address and I'll send you a Holden manual that might help you debug your issue.

My e-mail is jmcmickle@cablelynx.com . Thanks Jim