the edge reads fuel pressure

all that stuff comes on when the key turns. just no wait to start light

we had the wait to start light up until late last night

 

Check fuel pressure with an actual gauge... It shouldn't have any pressure without it being cranked or running...

 

i was looking at the wrong line. however fuel is coming into the bowl from the bottom of the bowl

 

alright listen, what you need to do is get a scanner on it and see what your high pressure oil is at while cranking.

im assuming you've checked all your fuses?

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and did you do anything differently to make it so the wait to start light would stop coming on? unplug anything?

and another question, when you jumped it. did you make sure the key was off before you hooked up your cables?

 

Having a real hard time finding a scanner. Only fuses out are trailer stop left and right #s 6 and 7 under hood. It stopped coming on when we unplugged the icp i think it is. Drivers side head. And the engine light came on then too. But its been plugged in since. As for jumping he did it and i wasnt paying attention

 

well thats actually a good sign. it shows your pcm is powering up and is reading inputs from sensors.

what about fuses from the smartbox under the hood??

 

i had a 7.3 on one of my batteries and a chevy 2500 with the 6.0 vortec on the other... still wouldnt start it finally decided to try putting a charger on it, cranked it up to 200 and started right up

 

smartbox? what are you referring to exactly?

also it is cranking pretty fast. we got code p1668 yesterday and checked the idm connector and recieved no power however the relay for the idm is clicking. even so i am going to check the output terminal on that relay. from diagrams i see that the idm relay is the last link before the idm. so there should just be a wire from the relay output to the idm. im thinking this wire may have let go somewhere. i am also doing this with a test light so i may switch to my (its too early to remember the name but it reads voltage and ohms and amps and blah blah blah). but if there is enough power for the relay to click i would assume that would mean there is enough power for the idm. i'm guessing its a matter of checking the connection on the distribution box and the idm connector. if those are in tact then tracing the wire and see where it may have failed.

still no luck on being able to find a scan tool. will look for a battery charger today while i'm testing

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terminal 85 in the dist. box for the relay is not lighting up. my diagram tells me this is distributed by the pcm relay

 

ok beautiful!

by smartbox i meant power distribution box under the hood, its for "new" term for the same thing...

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ok from what im seeing on that diagram, it looks like the pcm creates a ground for the idm relay to engage (in turn switching on the high amperage side of the relay). i think you got it narrowed down to that relay, a wire, or a bad pcm...

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and also for testing circuits going to your pcm, use a multimeter (what you were trying to find the name for) and not a test light, i've seen too many people fry good pcm's doing that.

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Code P1668- PCM TO IDM DIAGNOSTIC COMMUNICATION ERROR your on the right track good buddy!

ALLDATA says the cause of this could be a broken/shorted EF circuit, damaged IDM or PCM. measure resistance from pin 48 (on a breakout harness) or circuit 818 (gy/w) and IDM harness connector pin# 4. is resistance less than 5 ohms?

what ALLDATA is saying, if its not the pcm or idm (im thinking pcm because of your wait to start light no longer coming on) your looking for a short/open somewhere in your harness from your pcm to power distribution box, or from the box to your IDM

 

EF? i'm checking further into the idm enable output on the idm. its not lighting.