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Topic: Won't start (Read 3481 times) previous topic - next topic

Re: Won't start

Reply #60 –
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 –
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 –
Quote from: oldguy –
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 –
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 –
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 –
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 –
 ^.^d

Re: Won't start

Reply #67 –
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 –
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 –
Were you able to confirm a start?

Re: Won't start

Reply #70 –
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 –
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 –
ECM King were really good to work with. The engine got us down to Q today.