I have a vz300tlrc that blows the 20a ecm/fuel pump/ignition coil fuse above 6700 rpm. Runs good at idle to 6700, and the amp load is 8a, at 6800 it spikes this fuse at 79a, then replace the fuse restart and stay below 6800 rpm. There are no trouble codes. The local dealer wants to install a new $ 1451.50 ecm to see if the problem goes away. Has anyone heard of this problem.
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2004 vz300 ecm fuse blows at high rpm
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Originally posted by david2014 View PostI have a vz300tlrc that blows the 20a ecm/fuel pump/ignition coil fuse above 6700 rpm. Runs good at idle to 6700, and the amp load is 8a, at 6800 it spikes this fuse at 79a, then replace the fuse restart and stay below 6800 rpm. There are no trouble codes. The local dealer wants to install a new $ 1451.50 ecm to see if the problem goes away. Has anyone heard of this problem.
Please confirm that you are seeing 89 amps through a 20 amp fuse. What are you using to measure current flow?
Since the redline (not to exceed) RPM is 5500, perhaps if you just kept the motor under control you might not be blowing fuses.
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2004 vz300 ecm fuse blows at high rpm
Tach on boat was set to the wrong pole #. Rechecked the rpm with a scan tool. The fuse blows at 4500 rpm. I have pulled all the wire connectors to inspect for moisture or burning, found none. Have also checked the harness where is touches metal parts for a short, removed and cleaned all harness grounds. The engine history showed zero hours run time for 6000-6500rpm, and rev limit is 6200 rpm. 277 hr total run time, 207 hr 0-1000rpm. Sorry for the bad rpm info.
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In case you have never looked before the Owners manual says full throttle operation is 4500-5500.
You should be propping to get there
Have no idea why the 20 amp fuse is getting a heavy draw at higher RPM.
Maybe Rodbolt17 will give you some ideaLast edited by 99yam40; 10-10-2014, 09:20 AM.
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2004 vz300 ecm fuse
vz300tlrc engine specs full throttle range 4500-6000 rpm, 300 hp at 5250 rpm Someone mentioned it could be one of the injection driver computers. This motor still spiking the ecm fuse at 79 amp surge 9 times now. Testing peak current with an Amprobe digital amp clamp.
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Originally posted by david2014 View Postvz300tlrc engine specs full throttle range 4500-6000 rpm, 300 hp at 5250 rpm Someone mentioned it could be one of the injection driver computers. This motor still spiking the ecm fuse at 79 amp surge 9 times now. Testing peak current with an Amprobe digital amp clamp.
Only thing that comes to my simple mind is a chaffed wire that is shorting to ground causing excessive current flow.
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