View Full Version : ecu test?
09-25-2010, 10:43 PM
is there a way to test the ecu to see if it is bad? I'm about at my wits wnd with this friggin bike! lights come on and dash comes on, i hear the relays kick over but nothing else. the pump doesn't prime and there used to be a winding and clicking noise after the key is turned off, that is gone too. other odd things are happening too.when i hit the horn button, the horn just kindof weakly buzzes, and the lights go out then back on again. starter button does not engage the starter, the solinoid just rapidly clicks. the batter tests good (13.5 volts). the bike has been down for a couple of weeks and its really pissin me off.
09-25-2010, 11:56 PM
It's the battery.
09-28-2010, 07:25 AM
it is not the battery.
09-28-2010, 08:42 AM
any other ideas out there? I need a greg house diagnosis i think.
09-28-2010, 09:14 AM
A battery can test at 13+ volts on the meter, but be bad, because it can't provide the amps. Using a Battery Tender? They lie when the battery is at the end of its useful life.
My bike had all those same symptoms, which went completely away with a new battery. A weak horn and clicking starter solenoid is the giveaway.
09-28-2010, 09:39 AM
i replaced the battery (with a new one) this morning after having it on the charger all night. the engine turns over now which is an improvement, but everything else is the same. i'm trying to go over the bike to see if there is anything that i have missed and trying to find all the stupid safety stuff that typically causes all the problems but nothing is helping.
09-28-2010, 11:50 AM
Check your grounds. There are grounds on both sides of the engine, attached to the cylinders (blue wires?). And the main ground strap as well.
10-04-2010, 09:59 PM
Check your grounds.
What he said.
01-16-2011, 07:33 PM
Using a wiring diagram, volt-drop test all your powers and grounds as follows:
Voltmeter negative clipped to battery positive, probe each power circuit at ECM and measure voltage while cranking. This is your "volt drop" value. Good value will be under 1/2 volt.
Voltmeter negative clipped to battery negative, probe each ground circuit at ECM and measure voltage while cranking. Good value will be under 1/2 volt.
A bad ground will read much higher.
If all powers and grounds measure under 1/2 volt, you have no power or ground issue, move along.
Just realized this thread is months old. Sorry.
What finally fixed it?
01-23-2011, 01:17 AM
If you replaced the battery and you can't hear the pump when you turn on the key, then you must have placed the tip-over sensor the wrong way up.
Check it out
Micah / AF1 Racing
01-24-2011, 08:07 AM
Tip over switch is very likely if you are getting no fuel pump priming.
01-24-2011, 08:20 AM
Sounds more like a rotten harness behind the RH cooler
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