1 short blink. FI Light

yeah, my 2000 Honda VFR800 with 20k miles.

Loss of power above 4000rpm. Very noticable.

Random stalling.

FI light. Cycle the key it goes away.

I cannot find this on here. What is just one short blink.

 

According to the shop manual 1 short blink indicates "loose or poor contacts on MAP sensor connector", "open or short in MAP sensor wire" or "Faulty MAP sensor".

But it also says with engine operating normal, not sure if that means under load or at idle though. Should give you a place to start though.

 

Yeah, i found that online.

It is running poorly, and I checked the MAP sensor. It's fine.

I am afraid it's the ECM. According to the Shop manual, it's bad. I am getting wrong voltages.

But before I buy a $750 ECM from the dealer, I need to really confirm this. Anyone know how?

 

How did you measure the voltages for the ecm, do you have the test harness for the ecm?

 

I do not. I thought only dealers had that.

I am going to try replacing the MAP sensor, since that is cheaper, but I don't believe that is the problem. About 3-6 months ago, I was blowing fuses for the fuel pump. Something is not right.

 

Without the test harness you can't test the ecm output to the MAP sensor, that's why I asked. So basically you tested the MAP harness side wiring voltage at the r/y wire and ground...what voltage did you see? What voltages did you see on the other two wires?

 

Here is what I found.

I found the right voltage between pink and ground. It was near the minumin of 4.75v.

I measured between pink and green/orange. Got low voltage but within spec.

I measured between light/green and green/orange. got only 2.5v. Something is wrong. The wire is intact for what I can see. The loom and tape wrapping the wire has not been disturbed, but I didn't cut it open to check to make sure that wire specifically hand't been damaged. But I would say, that wire is fine, not the problem.

Only thing left, is to get the PGM-FI unit checked?

 

ok, after reading your last post (blowing the 10a fuel pump fuse), it basically looks like you have more electrical issues than just the MAP. I would check all of the sub harness connectors for corrosion and poor connections, before I did anything else.....sounds like there is an open circuit, intermittent contact issue potentially going on. If it was me I would disassemble and inspect every connector and apply dialectric grease and reassemble..also verify that all of your grounds are good and tight.

 

If the MAP sensor is bad, not connected, or the associated vacuum tubing is compromised, these machines won't run at any throttle opening except idle...........

 

^^Well, it runs best at low rpm range. Anthing higher than 4000rpm and it's like an anchor is attached.

The other problem has been fixed. It was a poorly insulated wire causing problems. I replaced the wire and sealed it nicely.

But I am still having similiar issues as before, except without the fuse popping. This loss of power is really bothering me.

Oh, and it wasn't 2.5v, it was 4v. Must have had a bad connection. Still out of spec though.

I have re-checked all of these 4 times now. It leads to the PGM-FI unit. OR the wiring harness leading to the PGM-FI. But I have been searching and searching. I cannot find anything that indicates trouble anywhere on the wiring harness.

 

My suggestion is to remove the ECM, and hold it in your hand while you start the bike. Then jiggle each wire to see if you can reproduce the fault. Three years back I had similar problems and it proved to be a broken wire to the ECM - I needed a magnifier to see the break as the insulation was mostly intact.

 

thanks. I am currently trying to find a new wiring harness on chEapBAY.

 

Well, I am taking it to the mechanic today. Yuck. I really prefer to do it all myself.....but this is beyond me.

I'll update as I hear things.