Won't start

Topic: Won't start (Read 2901 times) previous topic - next topic

Re: Won't start

Reply #50 – January 19, 2024, 03:13:39 pm

Make sure the engine shutoff button at the rear isn't shorted out.

Re: Won't start

Reply #51 – January 19, 2024, 08:00:23 pm

Check the rear stop button and it seems to be working fine and went its pushed it opens the relay
that feeds the ECU and I checked with a Tone Tracer and it looks like the ECU feeds the fuel solenoid.
It looks like I won't get the ECU until Tuesday. UPS flight problems. It was supposed to be in Point
Roberts today and I guess they don't work on weekend and the place I was to pick it up is closed
Mondays.

Re: Won't start

Reply #52 – January 20, 2024, 04:45:57 am

Looks like the fuel supply solenoid could be powered off connector C pin 16 on the ECM. So without the ECM, it wouldn't have power. That is if the second schematic I posted matches your engine.

Re: Won't start

Reply #53 – January 20, 2024, 10:52:24 am

Post 45 is the same as mine. I missed it when I tried to find it the other day. I will start looking at
it. Thanks

Re: Won't start

Reply #54 – January 20, 2024, 10:55:26 am

I think the M11's and ISM's need to see oil pressure before they will turn on the fuel.

Re: Won't start

Reply #55 – January 20, 2024, 11:14:11 am

I put in a preluber so I have oil pressure before I turn the engine over.

Re: Won't start

Reply #56 – January 20, 2024, 11:57:26 am

Quote from: oldguy – January 20, 2024, 11:14:11 am

I put in a preluber so I have oil pressure before I turn the engine over.

Also looking for rotational speed as I recall. Do you see any RPM to the silverleaf while cranking?

Curious if anything was said about the internal ECM battery?

Re: Won't start

Reply #57 – January 20, 2024, 11:59:48 am

Quote from: TGordon – January 19, 2024, 12:48:31 pm

Can you post a pic of your ECM?

Cummins ISM ECM 3681405 – GoECM

Re: Won't start

Reply #58 – January 20, 2024, 12:50:30 pm

Quote from: craneman – January 19, 2024, 03:13:39 pm

Make sure the engine shutoff button at the rear isn't shorted out.

Ah,, I didn't know there is/was one!
Where is it?

Re: Won't start

Reply #59 – January 20, 2024, 12:52:46 pm

Mine is a CUMMINS CELECT PLUS ECM 3408300

Re: Won't start

Reply #60 – January 20, 2024, 12:54:55 pm

When I open the engine door it is right at the top near the start button and oil light.

Re: Won't start

Reply #61 – January 20, 2024, 07:15:22 pm

The relay that the wire was off has nothing to do with the ECM. I have keyed power to the ECM. According
to the drawing I'm to have 4 wires call unswitched battery 12 v pin 20, 21, 22, 23. Anyone know where the
power comes from.

Re: Won't start

Reply #62 – January 20, 2024, 11:22:37 pm

Quote from: oldguy – January 20, 2024, 07:15:22 pm

The relay that the wire was off has nothing to do with the ECM. I have keyed power to the ECM. According
to the drawing I'm to have 4 wires call unswitched battery 12 v pin 20, 21, 22, 23. Anyone know where the
power comes from.

Directly from the battery?

Re: Won't start

Reply #63 – January 21, 2024, 12:07:33 am

Not on my coach. The only thing on my battery is from the voltage regulator. I have been trying
to use a tone tracer but so far I haven't had any luck.

Re: Won't start

Reply #64 – January 21, 2024, 02:16:13 pm

What do the two fuses feed that are behind the engine. One has full voltage and the other won't
light up a test light. If I use a voltmeter I get nine volts and and if I use an LED test light it goes down
to 3 volts. I know the engine will not start with those fuses gone.

The ECU unswitch leads give out 4 volts and with LED test light nothing. Out of the 4 connectors
they are paired with two common circuits. I think I have a very bad connection somewhere.

Re: Won't start

Reply #65 – January 21, 2024, 04:19:57 pm

I now have power to the fuse behind the engine and at the unswitch connectors for the ECM.
There is a connector just below the fuse holders and I was trying to get it apart and then thought
I would check fuse again and found power. I haven't gotten the connector apart yet but I bet its
all corroded inside. Just after I got the coach it wouldn't start and the fuse holder was corroded.
We now know that the two fuse holders connects with two pairs of unswitched connectors in the EMC

Re: Won't start

Reply #66 – January 21, 2024, 04:48:14 pm

Re: Won't start

Reply #67 – January 21, 2024, 09:29:13 pm

I've now got power to the EMC connector. Got the connector apart saw a little corrosion inside but
when I started to replace it the 2 hot wires fell out of the connector. All there was green corrosion.
kgrover thanks for the drawing it made a huge difference for trouble shooting. I don't know if I
would have found the problem with out it.

Re: Won't start

Reply #68 – January 23, 2024, 11:03:49 am

I figured out last night that the the 2 fuses behind the engine feed two pairs of the connectors in the
ECM. The 4 unswitched connectors in the ECM are paired so two the connectors goes to one fuse
and the other two go to the other fuse. The power andthe ground comes from the two posts that are
on the frame right off the battery and they are #8 wire. The ECM uses a lot of current. I clean up #65
post to state this.
There was also problems with one of my fuse holder so I replace both with 30 amp holders using 15
amp fuses.

Re: Won't start

Reply #69 – January 23, 2024, 11:31:52 am

Were you able to confirm a start?

Re: Won't start

Reply #70 – January 23, 2024, 11:35:32 am

I will pick up the ECM today and we are all packed to leave tomorrow morning hopefully.
I will post when I have it running.

Re: Won't start

Reply #71 – January 23, 2024, 09:58:41 pm

It started right up and the coach is out on the street with the toad hitch up and ready to head to
Q. We will leave at 6:30 AM. Knowing what I know now It would have taken me an hour to figure out
what was the matter and I would have gotten 4 days of skiing in.

Re: Won't start

Reply #72 – January 26, 2024, 08:18:23 pm

ECM King were really good to work with. The engine got us down to Q today.

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