FI Light stays on

Hello everyone,
I took my 1998 VFR for a spin yesterday after two weeks of standing ( rainy and cold weather), started without any issues, went for a 30 minute ride, parked it on the side stand and shut it off. After a hour started the bike and the FI light stayed on; started again but nothing changed. The bike starts and runs well , arrived home, removed the battery, charged it, put back but the light stays on.
Any tips on what should I check?
Cheers

 

Suggest retrieving the error codes from the ECU.... see what you have and go from there.

 

I tried to read the error codes but the FI light is not flashing, absolutely nothing, it just stays on and nothing happens.
Found some things on google to check: removed the negative terminal from battery and turned the ignition ON for 5 minutes, nothing.
Tried to insert the paper clip into the diagnostic connector while the bike was idling, it should have dumped ECM historic error log and the light should start blinking, but nothing.
Removed the kick stand sensor and put the bike in 1st gear while idling and the engine switched off, I guess the sensor is good.
Will check the voltage of the battery later and with that I'm out of ideas what else to do

 

My memory is bad, but I had an FI light on mine, and it turned out to be a MAP sensor issue. I found a used one, replaced it and that fixed it up. Don't know if that is your issue, but not likely anything to do with the start circuit/side stand/clutch switch/kill switch... Perhaps ensure MAP sensor connections are clean and hoses good. There's a second MAP behind the right side/tail cover that has no hose and is vented to atmosphere. You could try swapping them around.

 

I checked the voltage of the battery and it says 12.8V, with the engine started the multimeter read is 13.5 to 14V. I then put the multimeter again on the battery and when I started the bike the voltage dropped for a second to 9V and after that it went up to 13.4-13.5. I'm guessing the battery is on its last legs, it has more than 2 years
Will check the MAP sensor as well, thanks for the advice.

 

If you have doubts on the battery take it to any major auto parts chain store and let them load test it.

 

Your procedure for getting the FI into diagnostic mode sounds flawed. On the sidestand with the engine idling should generate blinks. Or with the ignition off, short the service connector, then turn the ignition on, will generate blinks if there are any stored faults. If that doesn't work there is a reset procedure as well to clear any stored fault codes.

 

I will check everything again, also got a new battery ( the old one wasn't even the right spec, 12V 11.8 ah).
Could it be that the bank angle sensor is bad and the bike doesn't know it is leaning on the side stand? I'm thinking of this because a butterfly flew from under the dash when I removed the bike cover and maybe it messed up some wires.

 

The bike is running, so bank angle sensor should be OK??

 

I've dealt with a handful of FI lights on various Hondas. None have ever been due to a failed sensor. Dirty wiring connections or crispy fuse holders were cause of all.

If you can figure out what code is triggering that light, pop open a wiring diagram. Trace out the affected circuit. Crack open and clean connectors that go to it. Hold off on buying any parts.

Most connectors on these bikes aren't sealed like deutsch connectors. With exception of ECU and maybe injectors, most are open to atmosphere. Oxidation brings resistance which brings headaches

 

Yes it starts and runs well

I can not get it in diagnose mode, the FI light does not blink at all. Bike on side stand, kill switch on RUN, paper clip in diagnose connector , ignition ON-> no blinks; start the engine and the light stays on

Should the bike start if the MAP sensor is disconnected ? I removed the plug from the sensor and the bike started

 

As the engine starts normally and there are no blinks and the light stays on I'm thinking the problem comes from one of the reasons from this picture.
I checked the voltage at the service check connector and it reads 5V, so I guess it is good.
That leaves me with other two reasons: short circuit in the malfunction indicator wire or a faulty ECM.
To check the malfunction indicator wire the dash needs to come off?

 

Have you maintained the ground block on the side of the bike in the wiring loom? This is a weak point and many including myself have soldered it together (in two parts). It can make the Fi light come on and in time stop the engine on occation.

 

Have you recently changed out the instrument panel backlights with LEDs? If so, there is a gremlin lurking within the FI circuit that will keep the FI light lit. Pop out the LED at the FI spot and put in the original incandescent bulb and see it that helps. You may find you have no issues at all. Hopefully this helps.