The relay is supplied power. you should be able to jumper pin A9 and 87 and the solenoid should engage.
The relay is supplied power. you should be able to jumper pin A9 and 87 and the solenoid should engage.
97 GMC, 2002 LS6.
1991 GMC Syclone #1428
ok now I'm getting a P0107 MAP/BARO circuit low input error. Did have the line that goes to brake booster undone, but wouldn't think that should matter. Or could it be the MAP sensor is bad? Would this prevent spark?
go out 30 minutes later just to check it and as of 1:40 pm no codes are coming back. So back to square 1. No codes.
Last edited by 468Blazer; 08-12-2008 at 12:39 PM.
1996 GMC extended cab, 2003 5.3/auto
the map sensor is probably good. Was the truck running with the booster line off?
Did you try jumpering pin A9 and 87 with the relay out to see if the solenoid engages?
97 GMC, 2002 LS6.
1991 GMC Syclone #1428
Originally Posted by NITROUS
right now, he just has the yellow wire connected directly to the starter solenoid.
is there a chance the neutral safety switch is bypassed and this would cause a no spark condition or if bypassed it becomes irrelavant, as the starter is working?
engine has yet to fire.the map sensor is probably good. Was the truck running with the booster line off?
hey lil bro, time to make that call to edelbrock/msd.
Last edited by LSXmyford; 08-12-2008 at 02:50 PM.
LSX conversions, so easy a caveman can do it.
Power from the crank output at the switch goes to the PCM crank request input. If the PCM sees P/N and there are no security issues, the PCM grounds the starter relay. When the relay closes, power is transmitted to the starter.
P0107 sets when the PCM detects that the MAP sensor voltage is less than 0.10 volt for more than 4 seconds. This will not prevent spark. The MAP sensor is a 5V sensor, not 12V like the MAF. You should have 5V on the grey wire, a good (end to end) signal circuit on the light green wire, and continuity to ground on the orange and black low reference wire. If you have a scanner you can check the signal and 5V wires at the same time by jumping the grey to the light green and looking for 5V on the scanner reading for the MAP. Use a meter set to DCV between the 5V and low reference wire to then check the ornage and black wire (meter sould read 5V). I'd guess there's a problem with your low reference circuit if other 5V sensors aren't setting codes.
Last edited by GasGuzzler; 08-12-2008 at 03:20 PM.
Is that your way of saying its ok to connect the yellow wire directly to the starter solenoid?
LSX conversions, so easy a caveman can do it.
That would hot wire the truck past the neutral SAFETY switch. If the security is still active on your truck, it still won't start that way because the PCM knows it hot wired. It would crank though.
I've installed new crank and cam sensors. Still no go. I am currently getting a battery for my meter since it went dead but with the test light on "12 volt references" it has a light just weaker than it should be. Will test that in a bit once I get a battery.
It seems I'm getting power and ground to everything. What am I not getting here or what should I check?
1996 GMC extended cab, 2003 5.3/auto
No more DBW SES codes? Did you ever get a noid light and see if the injectors are pulsing at crank time?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
on the cam sensor and pcm 12 volt references getting 11.4 volts so thats not a problem.
no more DBW codes. No codes at all coming back.
I'm begining to think there is something in the PCM not turned off that should be or the PCM isn't anygood. But wouldn't the folks at Nelson Performance at least test the PCM for function before sending it back. Jon did say that the vats according to the file was turned off.
Another thing I don't understand is that the red light on the diagnostic stays on like there is a code but when I hook my scanner up there's no codes.
Last edited by 468Blazer; 08-12-2008 at 04:58 PM.
1996 GMC extended cab, 2003 5.3/auto
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