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It is under the seat in front of the battery. (the correct name is "Vehicle down" switch). It is held in place by a single Philips-head screw and a tab on the bracket locates in a hole in the frame to keep it from turning or moving. If the switch is faulty, it will prevent the bike from running. It shuts the bike off in the event of a lay-down.

The following 2 paragraphs are from the service manual:

This sensor has a weight with 2 magnets inside, and sends a signal to the ECU.  But, when the motorcycle  banks(40~50 degrees) or more to either side, (in fact falls down) the weight turns and shuts of the signal. The ECU senses the change, and stops the fuel pump, injectors, and ignition system.

When the motorcycle is down, the ignition switch is left ON. If the starter button is pushed, the electric starter turns but the engine doesn't start. To start the engine again, raise the motorcycle, turn the ignition switch off, and then on. When the switch is turned on, current flows through the latch-up circuit and the transistor in the circuit is turned on to unlock the latch-up circuit.

However, if the switch is faulty or comes loose on its mount, it can also go into a "vehicle down" condition and it usually won't correct until it is remounted. This bear looking into.

Hope this helps. Good luck,

Regards and such,
49Reo

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Posted by asklapios

- April 02, 2012, 11:54:54 AM

Quote from: 49Reo on April 02, 2012, 10:26:37 AM
Did you test the tip-over switch?

Regards and such,
49Reo

tip-over switch? what is this?

Posted by Troll

- April 02, 2012, 10:50:29 AM

How about the EFI main relay?

Posted by 49Reo

- April 02, 2012, 10:26:37 AM

Did you test the tip-over switch?

Regards and such,
49Reo

Posted by asklapios

- April 02, 2012, 01:19:45 AM

dear friends,
all test results show my ECU is death...i want to know some information and i need your helps...which are model's ECU compatibility with my 99 1500 drifter's ECU?

Posted by 1999 Drifter

- April 01, 2012, 22:33:33 PM

my 99 1500 would not start this spring.
I put a battery tester on it, it read 13.4v so I figured I had a problem not sure what. Checked everything and couldn't find any problems, now I had no lights , dash, horn etc.
I figured I'd start with the cheapest first and since I wasn't sure how old the battery was I thought I'd get it tested
Took it to a shop , he tested it .......12.4v
I thought good but he said lets put a load on it and it went from 12.4v to about 2v in about 5 seconds....battery no good...... must be tested under load
Hope this helps

Posted by chief

- March 25, 2012, 20:12:26 PM

http://www.vulcandrifterriders.com/ECUFaultCodes.html

Try this page for some info.

Posted by Troll

- March 25, 2012, 19:30:43 PM

What kind of ign switch (key switch) do you have? Aftermarket switches are lots of problems. Did you check the primary fuse under the seat, at the back of the battery compartment?

Posted by ratze

- March 25, 2012, 18:28:40 PM

first off, have a cold beer. then check all ur ground connections an RIDE ON.

Posted by asklapios

- March 25, 2012, 18:22:50 PM

the battery ----ok
the junction box -- ok.--all fuses 10 A --- is it right?
all connections---ok
start switch turn on--ok
ignation switch turn on--ok
then starter motor ---works--on
but doesn't work fuel pump and other ignation systems...no FI lights...
what should i do ?

Posted by chief

- March 23, 2012, 09:36:40 AM

You need to do some troubleshooting to determine if it is the ECU. There are MANY more likely things that cause what you describe.

Start simple, make sure switches are in the right position and connected properly, check battery and fuses.

Posted by KsDrifter

- March 23, 2012, 08:50:09 AM

Not to be an ass, but what process did you use to determine if it was the ECU? When you flip the key on, do you have any power anywhere? How many volts do you have at the battery?

Posted by asklapios

- March 23, 2012, 04:44:47 AM

Is this real? My Drifter - 99 1500cc - was dead. because my ecu is dead... what can i doing my ecu problem...

when i wanna start my bike than i turn to the ignation switch and i doesn't hear fuel pump and i doesn't see no FI lights my speedometer.i have serius problem my ECU...

buy a new ECU or compatibilities a different motorcycle ECU?

help...please...

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