hosanna64

I don't have a scan tool to hook up to the cummins diagnostics ports. I am thinking my ecm is bad. If it is, what is the best rout to take as far as replacement or having it rebuilt.

I think it is 1693 and 237. It is the one for low boost and companion code. I replaced the map sensor and haven't been able to clear those codes since then.

Thank you all for the replies. update: I replaced the vp and it didn't start. I have replaced the cam position sensor, crank pos. sensor, starter, and batteries. still no start. I read on blue chip to hot wire the vp. Did that and started right up and idled. Then hot wire got disconnected and died. So chasing down electrical demons. Narrowed it down to the pin 7 on vp plug gets 12v while key is in run but immediately drops to about 9.5v when in start. This is causing my starting problem. Also I can't seem to erase any of the codes stored. Would this indicate a bad ecm or something else? I have cleaned all grounds that I can find. Thanks again.

The batteries were low before I tried to start because of the lift pump not working properly. When I said 30 seconds, that was the time I tried after installing the new lift pump and bleeding up to the vp. They still may need to be changed out, but have a date of 2010 on them. I have 12.79 on each battery now so that should be sufficient to try a start. Thanks all. - - - Updated - - - Here are the connectors that I found disconnected

Make absolutely certain you have no leaks in the fuel line anywhere. A minor leak will introduce air into the system and cause hard/ no starts. How long are you cranking the engine with the injectors cracked loose? Which other sensors did you have to plug in? That is rather strange why they would be unplugged in the first place....Will check for leaks. I have only cranked about 30 seconds total because of the batts dying again. All of the other sensors seem to be plugged in but I do have some weatherpac connectors that aren't plugged into anything underhood. I will try to get pics and see If anyone knows what they were/are supposed to be plugged into. I also thought it strange so it made me wonder if they were hiding something just to sell as I got the truck for around 2000.

Is there another place to connect scan tool too besides under the drivers dash obd port? I did the key trick and no codes same as obd port.

I think I have not communicated well so far. I own and have used a scan gauge for several years now. I scanned this truck after hooking the charged batts back up and found 0one codes. I assumed I had erased them by disconnecting the batteries. You know what assuming does though. LOL. My concern is focused on the vp and does anyone think it has to be ok because it ran and drove when I bought truck. Just looking for some opinions from more knowledgeable folks than myself. I do not mind replacing but why if it is good?

unfortunately I disconnected the batteries to charge them before reading any codes with scanner. Now that it won't start, I don't get any codes from obd port. You answered my question as to the vp though. My understanding is that it won't fire without sufficient high pressure from the vp to pop the injectors open. So that means to me the vp should be good just need to bleed it sufficiently. Is there any thing else I should do besides crack open the injector lines then use starter to prime until fuel comes out?

I am new to diesels and just bought this 99 which ran when I went to pick it up. It started really slowly like the batteries were dying but still ran. I got it home and realized the crankshaft sensor wasn't even plugged in. This was the reason the batteries were not charging. I replaced sensor and started looking around and found alot of unplugged wires in the engine compartment. Tried to start and lift pump was not pumping just making noise. Replaced lp on side of block and got pressure to vp at banjo entry. cracked lines to injectors and there was only a little dribble from any of them. Still no start. My question is: is there a way to rig these trucks to run without controls and with a bad vp just to sell? Or is my vp still good and some other sensor is causing the vp not to work. Thanks for your time and the best resource for these trucks.