Re: Tour of your fuel pump circuit aka Update on Sprint RS not starting

[Jan and Don Draper <ddraper@xxxxxxxxxxx>]

Hi Andrew,

Thanks very much for this detail; it may come in handy.

The bike is currently back at the dealers; here's the update
since you seem like a troubleshooting fan-

I rode the RS back from the dealer's Wednesday evening 
after they replaced the fuse.  On the freeway, the power cut 
out once for 5 seconds, with the yellow engine fault light on.  
Then the power returned and the fault light went off.  After that, 
the bike ran fine for 1 hour.

This morning the bike wouldn't start.  The fuel pump did not 
turn on in 5 tries.  An hour later, it ran.  I rode one hour to the
dealers, it ran fine.  At the dealers it stopped running, then 
resumed.  The dealer replaced the relay near the fuse box,
and I left for home.  After riding for 20 minutes, I stopped.
The bike would not restart.   I tried many times over 2 hours
to start.   Putting my ear to the gas tank, I could hear a faint
humming/clicking sound somethat like an electric motor trying
to start with insufficient juice and somewhat like a starter motor
with insufficient juice.  This was just turning the key.  The noise
would last for about 5 seconds, then stop every time I turned the
ignition key on or cycled the kill switch.  The humming would continue
for 5 seconds once initiated whether the kill switch and/or ignition
switch was left on or turned off.

When the dealer came for the bike with a truck after 3 hours, the
bike failed like this twice, then started on the third try.

Strange.

Thanks again,

Don








- ----- Original Message ----- 
From: <abell06@xxxxxxxx>
To: <ddraper@xxxxxxxxxxx>
Sent: Sunday, January 14, 2001 7:03 AM
Subject: Tour of your fuel pump circuit aka Update on Sprint RS not starting


| Don,
| Not knowing if you are on digest or not I am sending this direct as well
| as to the list.
| I hope in some fashion this might help you diagnose the failure.
| Electrical is a bugger to do long distance.
| 
| Good luck,
| Andrew
| 
| 
| 
| 
| 
| 
| 
| >Both times the bike wouldn't start it had been unused for a few
| >weeks and was cold and damp.
| 
| >Don Draper, Jr.  "Blue Dawg"
| 
| 
| Thank you for joining the tour of your fuel pump circuit, please no
| crowding...watch your step.  No smoking please. Beware of side trips
| into related systems.....
| 
| I was going to suggest the fuel pump had frozen moisture in it, but
| after refreshing my memory the fuel pump is submerged in the gas tank,
| and you probably put a little gasline antifreeze in?
| 
| 
| So here goes the electrical analyses. Starting at the fuel pump....the
| Black wire goes to system ground (not related to the two black wires
| from Alternator), the purple/white wire runs to the following(bear with
| me) all three ignition coils then continues to the fuel pump relay**.
| the fuel pump relay coil is connected directly to the ECU with a
| black/purple wire, the other side of the coil is a green/red wire that
| goes to the alarm connector, now the plug-in jumper connects pins 1 to
| 2  and 3 to 5  ,  the connector on the main harness (pins 1,2,3 are all
| green/red)  pins 1 and 3 are tied together, pin 2 from the alarm (main)
| connector goes to the fuse block (fuse 1 I believe) the wire still
| green/red continues from the other side of the fuse to the Kill switch,
| then changes color to green and continues to the ignition switch
| connector.
| 
| Pin 5 from the Alarm (Main) Connector green/red continues to the starter
| 
| switch, the wire leaves the switch as white/red which goes to the coil
| of the starter solenoid and also to the coil of the headlight cut out
| relay, the other side of which is black system ground.
| 
| **Back at the Fuel Pump Relay the purple/white wire connects to the
| relays contacts, the wire exiting is solid purple continues to the
| following locations, to connections at the ECM relay(pins 1 and 6) then
| pin 16 of the diagnostice connector, and the fuse block #8 the other
| side of the fuse is tied to Brown which goes to other fuses #'d 6 , 9
| ,10 , pin 4 (yellow/brown) of the ECM relay goes to the ECM pin 86, pin
| 8 (brown/pink) of the ECM relay goes to two locations,  the purge valve
| pin 2 , exiting the Valve pin 1 yellow/red directly to the ECM pin26,
| and to pin 6 of the Cooling Fan relay coil, pin 4 of the Colloing fan
| relay (black/yellow) goes to the ECM pin 25.
| 
| pretty simple!! not!!
| 
| All of this of course begs the question, did the fuse blow when you
| turned on the ignition, or after you pressed the starter button? The
| answer will allow you to zero in on which section of the wiring and
| electrical components you should examine, should you decide to undertake
| 
| the repair instead of the experts at the dealers.
| 
| Thank you for joining the tour of your fuel pump circuit, please come
| again...watch your step upon departing.  No smoking please.
| 
| 
| Peace,
| Andrew
| 00 Sprint ST
| 
| 
| 


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