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Hi mike thanks for your help these are the original codes
I can't connect the obd when the intermitant fault shows up and the gas gauge goes beyond high when the fault gone and can conect the obd now has no codes maybe cleared from removing neg from battery ?
This all started driving home one day and the gas gauge went crazy and and it seemed to be missing or something
Parked up then would not start initially but would start intermitantly after that it seems it would start only when the fuel pump primed when i turned the ignition on
Gm codes :P0608, P0650, P1504. Generic code: P0650
I was using blackberry earlier and hard to type so here is the full details
Chevy 2001 G2500 Cargo Van, 5L (Express)
-Engine will not start when ignition Key turned and fuel pump doesn't prime. When the pump primes the engine starts. Also note either way it does turn over.When it did start it seemed like it was missing or something and I had to rev the engine to keep it going.
-Gas Gauge past full(when fault is present)
-Speedometer did not work or waved around
-Red lights Park, reverse and Neutral lights not lighting up although D,1,2,3 will light up when I move the gear lever over. note :when I remove the C2 Red connector from the PCM ALL lights work fine.
-At the fuel pump assembly every thing tests out ok and I am thinking about putting it back in the tank.
Pump works when given 12V, Ground good, relay works fine and the resister attached to the float works fine when the fault goes as it is intermittent. I now have the float assembly out of the tank so when the fault goes I can move the float and the gas gauge does slowly rise although when I move the float to the full position the gauge will only read 3/4 full.
-when fault shows the OBD will not connect
-When the fault is not there the OBD will connect but there no data because I think I pulled the battery and cleared.
-There is also something strange on ground 451, PIN 1 on the PCM red connector, Pin 5 on the Data link connector. It is a ground and grounding but seems like there is a mili voltage there.
Mike, I am an electrician by trade so I am good with the basics but don't have extensive knowledge of auto electrical
Original fault codes
I originally thought the cluster was done, but it and the connectors seem ok. It seems like something is groundig out somewhere, maybe a sensor or something.
I was starting to look at the speed sensor but don't no where it is could it have grounded out.
I re connected a main ground to the engine block and that has resolved the Park, neutral light issue, they all work now on the cluster. Still have the intermittent gauge problem. From the codes I hope you can point me in the right direction.
I am a bit concerned as I have not heard back as this is my third post
I think the cluster is OK and will get the pcm checked out and get back to you,
I have a fault somewhere as the battery keeps draining down and i dont think I should get the pcm and cluster looked at until I fix the fault. I pull out the radio fuse and the trans fuse and they both turn of the cluster speedo and P,R,D lights its weird. They shoud be completly seperate circuits and both are connectd to the cluster and pcm ?? any ideas