MCI 102dl3 no check engine light

Jcparmley · September 28, 2022, 03:40:05 PM

Hello all

I am in the process of selling my bus. I need to drive it 10 miles to the shop I'm selling it to. The fuel tank had a leak so I lost prime on the series 60. I set up an auxiliary tank and have everything plumbed correctly. However the bust won't start. I can crank it and it will turn over on starting fluid.

Then I noticed I have no check engine light. So my assumption is that my computer isn't getting power. I pulled the computer and checked the harness. There are three pins where I have power. So I thought that maybe it's the computer. So I swapped it with my spare. No luck.

I checked all my grounds. I have power at the batteries, the front bay, the junction box mail relay and the master switch. However I am not seeing any check engine light and when I try the manual check engine button in the first bay the red light does not flash. Can someone walk me through the trouble shooting? Please

buswarrior · September 28, 2022, 03:42:14 PM

Did you prime the fuel system?

Multiple issues now...

Happy coaching!
Buswarrior

Jcparmley · September 28, 2022, 05:29:34 PM

Yes, I did prime the system. This is on my 102dl3 bus. I know it's confusing because I have two buses I am trying to get in working order. I did prime the system. It will turn over when I actuate the starter. The fuel runs from the temporary fuel tank, through the filters, through the head and back to the tank through the return hose. I just can't get it to start. Then I noticed that the check engine light wasn't coming on so I am assuming that the ECM isn't powering on and that is why the series 60 won't start. Does that sound correct?

Quote from: buswarrior on September 28, 2022, 03:42:14 PM
Did you prime the fuel system?

Multiple issues now...

Happy coaching!
Buswarrior

Bill Gerrie · September 28, 2022, 07:31:19 PM

Check the main power circuit breakers that feed the computer. They feed directly off the batteries.

Jcparmley · September 29, 2022, 09:50:56 AM

I have power at the computer harness but for some reason the computer isn't communicating. I have tried three different computers.

luvrbus · September 29, 2022, 10:04:25 AM

Quote from: Jcparmley on September 29, 2022, 09:50:56 AM
I have power at the computer harness but for some reason the computer isn't communicating. I have tried three different computers.

You have a bad ground all the functions except 1 work on grounds on a DDEC

Bill Gerrie · September 29, 2022, 10:41:30 AM

Good call luvrbus. I forgot to mention the grounds as well as the live ones.