VT600C wont start - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 12 (permalink) Old 12-04-2012, 11:49 PM Thread Starter
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VT600C wont start

Need help Please;
1997 VT600C Was in Hurricane Isaac in sept. It did not go under but was subjected to driving rain.
Problem; It wont start, Engine cranks, all lights work including turn signals and horn.
Some observances; Fuel pump relay black w/blue stripe and yellow wire are hot with ign. on. black wire is not hot at any time. Fuel pump is not pulsing unless I bridge the black and black/blue stripe wires, then it pulses but still no start.
coils; when I check the coils with ign on and cranking or not, both wires to both coils are hot all the time with ign on. There's a slight pulsing but it appears more like electric strain not coil firing.
ICU(ignition control unit); the yellow and the blue wires on the output side of the icu are not lighting at all (cranking or not).
The yellow and blue wires on the input side are hot with the ign on, cranking or not.
Local experts (anyone who knows more than me) say that it's highly unlikely that it's the ICU. I hate to start guessing but it seems like it could be the ICU to me. I hate to buy this part on a guess so I'm looking for any help someone can give me.
Thanks in advance...
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post #2 of 12 (permalink) Old 12-05-2012, 12:06 AM
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do you have spark at the spark plugs? is the battery fully charged, has it been tested? what is the battery voltage while cranking?

1999 VLX
1998 SA750
1991 NSX

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post #3 of 12 (permalink) Old 12-05-2012, 07:06 AM Thread Starter
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No spark at either coil or spark plugs
Battery is new, fully charged, with a trickle charger connected and reading 14 volts
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post #4 of 12 (permalink) Old 12-05-2012, 07:21 AM
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Did the air filter get soaked,,might be starved for air if so, even if it has dried out.

2006 vlx
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post #5 of 12 (permalink) Old 12-05-2012, 06:10 PM Thread Starter
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Input would be much appreciated. Thanks
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post #6 of 12 (permalink) Old 12-05-2012, 08:45 PM
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Have you checked the 4 pin connector and the ignition pulse generator to the ICM?
and the thing that doesnt sound right, is the black wire to the fuel cut relay should be the hot wire.
You also have the diode in the circuit, but that would normally also disable the starter I believe as well.

1999 VLX
1998 SA750
1991 NSX


Last edited by Scrapdog2grand; 12-05-2012 at 08:48 PM.
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post #7 of 12 (permalink) Old 12-05-2012, 11:10 PM Thread Starter
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There is no power to any of the wires on the 4 pin connector, which is why I'm thinking it could be the icm, since there is power going in on the 6 pin connector on the yellow and the blue wires. From what i have read on here the black wire on the connector for the Fuel cut off should be hot, I agree, but am wondering if maybe that is caused by the icm as well???
Mechanic at the local Honda shop said he has never replaced a pulse gen. I am still leaning toward the icm. Any further thoughts?
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post #8 of 12 (permalink) Old 12-06-2012, 12:03 AM
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Quote:
Originally Posted by lowride View Post
There is no power to any of the wires on the 4 pin connector, which is why I'm thinking it could be the icm, since there is power going in on the 6 pin connector on the yellow and the blue wires. From what i have read on here the black wire on the connector for the Fuel cut off should be hot, I agree, but am wondering if maybe that is caused by the icm as well???
Mechanic at the local Honda shop said he has never replaced a pulse gen. I am still leaning toward the icm. Any further thoughts?
did you check the 4 wire conncetor in between the ICM and pulse gens, not the one at the ICM.
I dont think your going to have power at any of the wires going to the pulse gens, havent looked at a manual for them, but they should be signal generators(small amount of current or voltage) not 100 % on them without doing some reading.

at the ICM
check the green wire for a good ground(continuity test?)check for high resistence with an ohm meter
Is the black wire hot at the ICM? it should be.

Is your nuetral light working? Light green and red at ICM, should have continuity to ground in nuetral.
And the green and white side stand up switch at ICM, continuity to ground with the side stand up only, if you loss that ground at any time, it will disable the ignition.

those last 2 switches also work with the clutch lever switch,the diode set and the starting system.

1999 VLX
1998 SA750
1991 NSX


Last edited by Scrapdog2grand; 12-06-2012 at 12:07 AM.
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post #9 of 12 (permalink) Old 12-06-2012, 07:09 AM Thread Starter
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Thanks, I'll check those things tonight and let you know. That's a big help!!!!
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post #10 of 12 (permalink) Old 12-06-2012, 08:37 PM Thread Starter
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I think you are right, it would make sense that it would not be full bat voltage going to the pulse gen. I got some MV reading there with my multi tester but it was erratic.
The green wire at the ICM tested good for continuity
The black wire at the ICM was hot.
Neutral light is working.
Light green/red has continuity to ground in N.
Side stand switch is working.
My last thought is the black wire on the FP cutout. It's definitely not hot at any time unless I bridge it. But even when I bridge it, the bike wont fire and it continues to have full voltage at both coil terminals on both coils.
Any more ideas, I'll gladly chech any lead. Thanks for your help!!!!
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