No Fuel Prime / No Throttle Body Movement - Suzuki GSX-R Motorcycle Forums Gixxer.com

 2Likes
  • 2 Post By TheGeek
 
LinkBack Thread Tools Display Modes
post #1 of 15 (permalink) Old 05-14-2019, 09:43 PM Thread Starter
Track Day Winner
 
ComponY's Avatar
 
Join Date: Aug 2017
Posts: 30
Garage
No Fuel Prime / No Throttle Body Movement

2008 GSXR 750 - Bike in neutral (tach says), kill switch in the correct position (tried another kill switch too) - Also, when the switch is off, the bike will not attempt to start. When I switch it to on, it does, but there's no priming or throttle body movement as usual.

When I turn the key, the speedometer goes all the way up, then down like normal. However, thereís no fuel pump priming or throttle body checks as usual. Yesterday, it was fine.

The ground wire was BROKE, so I went and got a new connector and crimped them all together. Thatís the only thing that has changed. Yesterday I had to hold the ground to the block. Now itís on there and I sanded the bolts as well as the connector and block. The connection should be very much solid.

Weird thing is.... The bike cranks! Just doesnít start yet (when trying to start). Charging the battery now, and will try multi-meter when I can. Any ideas? Someone mentioned tip sensor, and I tried unplugging it and moving it around. Also took the bike off the stand and messed with it a bit.

1. All lights work.
2. There's a "CHEC" but no codes are popping up.
3. Bike tries to crank when I try to start it, but no fuel priming or throttle body movement.
ComponY is offline  
Sponsored Links
Advertisement
 
post #2 of 15 (permalink) Old 05-14-2019, 10:16 PM Thread Starter
Track Day Winner
 
ComponY's Avatar
 
Join Date: Aug 2017
Posts: 30
Garage
Re: No Fuel Prime / No Throttle Body Movement

Found this video:


I'm having the exact same symptoms. So I may try to swap the ECU and see what happens!
ComponY is offline  
post #3 of 15 (permalink) Old 05-15-2019, 04:24 AM
I know things... A lot of things.
 
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Posts: 2,992
Re: No Fuel Prime / No Throttle Body Movement

Your ECU is probably not getting powered, likely due to a wiring problem. Search the forum for keywords like "CHEC, ignition, interlock, wiring, diagram" for more discussion on troubleshooting than you'd want.
dpapavas is offline  
Sponsored Links
Advertisement
 
post #4 of 15 (permalink) Old 05-15-2019, 04:33 AM
Track Day Winner
 
PaulPhilly's Avatar
 
Join Date: Jul 2018
Posts: 94
After the switch but before the stva and fuel pump correct me if I’m wrong I beleive there’s relays, a bad or weak ground on any electrical component could cause something like a relay not to mention I did not see u post a fuse check to blow.
PaulPhilly is offline  
post #5 of 15 (permalink) Old 05-15-2019, 11:36 AM Thread Starter
Track Day Winner
 
ComponY's Avatar
 
Join Date: Aug 2017
Posts: 30
Garage
Re: No Fuel Prime / No Throttle Body Movement

Quote:
Originally Posted by PaulPhilly View Post
After the switch but before the stva and fuel pump correct me if I’m wrong I beleive there’s relays, a bad or weak ground on any electrical component could cause something like a relay not to mention I did not see u post a fuse check to blow.
Fuses are all good in the fuse box. Should I buy another ECU and test that, or just order a new ground wire and stuff? The new ground seems to be pretty solid... As the bike will crank, but not start. No STVA movement, or fuel pump prime though.

Last edited by ComponY; 05-15-2019 at 11:39 AM.
ComponY is offline  
post #6 of 15 (permalink) Old 05-15-2019, 01:07 PM
Track Day Winner
 
PaulPhilly's Avatar
 
Join Date: Jul 2018
Posts: 94
I’d say that ground is not your issue, did u try testing the relays ? U can test them with a multi meter but it be easier to go to ur box and switch one with another, and if that don’t work re check all the wireing
PaulPhilly is offline  
post #7 of 15 (permalink) Old 05-15-2019, 01:25 PM
You should listen to me. No, seriously, listen to me.
 
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,245
Re: No Fuel Prime / No Throttle Body Movement

Check the voltage at the O/W lead on the dealer mode connector and the R lead on the nearby SAP connector. With ignition and kill switches on, they should be 12 V and 5 V.
BillV is offline  
post #8 of 15 (permalink) Old 05-15-2019, 02:31 PM
Uses squid tentacles as a butt-plug
 
750Squidiot's Avatar
 
Join Date: Mar 2019
Location: Valley of the sun
Motorcycle: K4 750
Posts: 242
Re: No Fuel Prime / No Throttle Body Movement

Quote:
Originally Posted by ComponY View Post

1. All lights work.
2. There's a "CHEC" but no codes are popping up.
3. Bike tries to crank when I try to start it, but no fuel priming or throttle body movement.
Pretty sure CHEC is always displayed when power is on but killswitch in in the "kill" position. You need to put it into dealer mode to express any codes I think...Not saying I know what the problem is but if you throw it in dealer mode it may throw back a code ?
750Squidiot is offline  
post #9 of 15 (permalink) Old 05-15-2019, 02:35 PM
Likes Diiiiiiiiiiiiiiicks
 
Just_Nick's Avatar
 
Join Date: Jul 2009
Motorcycle: 2006 GSXR "250"
Posts: 3,776
Garage
Re: No Fuel Prime / No Throttle Body Movement

If your fuel pump is not priming and it's trying to start, it's an ECU issue.
Just_Nick is online now  
post #10 of 15 (permalink) Old 05-15-2019, 03:44 PM
Dreaming of buttsecks for years...
 
TheGeek's Avatar
 
Join Date: Feb 2006
Location: Indiana
Motorcycle: Anniversary Edition 600 & 2018 Harley Street Glide
Posts: 13,206
Garage
Re: No Fuel Prime / No Throttle Body Movement

Wow.... just wow. Why is everyone jumping to step ten and skipping steps 2-9? Have you put a meter on the supply wire for the fuel pump to see if it's getting voltage? Have you put a meter on the hot side of the fuel pump relay to see if it's getting power?
MacBayne and 750Squidiot like this.
TheGeek is offline  
post #11 of 15 (permalink) Old 05-15-2019, 06:35 PM Thread Starter
Track Day Winner
 
ComponY's Avatar
 
Join Date: Aug 2017
Posts: 30
Garage
Re: No Fuel Prime / No Throttle Body Movement

Problem was definitely the ECU!
ComponY is offline  
post #12 of 15 (permalink) Old 05-15-2019, 06:46 PM
Likes Diiiiiiiiiiiiiiicks
 
Just_Nick's Avatar
 
Join Date: Jul 2009
Motorcycle: 2006 GSXR "250"
Posts: 3,776
Garage
Re: No Fuel Prime / No Throttle Body Movement

Quote:
Originally Posted by TheGeek View Post
Wow.... just wow. Why is everyone jumping to step ten and skipping steps 2-9? Have you put a meter on the supply wire for the fuel pump to see if it's getting voltage? Have you put a meter on the hot side of the fuel pump relay to see if it's getting power?
Because the throttle bodies would still move. Also, the usual safety measures of pulling in the clutch no longer work. If three things stop functioning at once and you have a spare ECU, that's way easier than testing the throttle body motor and pump individually. Now, if you have none available, then test each component.
Just_Nick is online now  
post #13 of 15 (permalink) Old 05-16-2019, 04:24 AM
I know things... A lot of things.
 
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Posts: 2,992
Re: No Fuel Prime / No Throttle Body Movement

Since there's CHEC on the dash it's more than likely that the ECU is not getting power (or has failed altogether). Unless that is determined not to be the case (as it usually is) I don't see the point in investigating why the pump or secondaries aren't operated. They shouldn't be expected to operate. I'll just add to Bill's advice that, should there not be an O/W wire in the dealer mode connector (as is likely given the cranks-during-CHEC condition), measure the O/G wire instead.
dpapavas is offline  
post #14 of 15 (permalink) Old 05-16-2019, 07:57 AM
You should listen to me. No, seriously, listen to me.
 
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,245
Re: No Fuel Prime / No Throttle Body Movement

^O/G is for an immobilizer equipped bike. O/W for non-immobilizer/US. He sounded US but maybe I'm wrong.
BillV is offline  
post #15 of 15 (permalink) Old 05-17-2019, 04:49 AM
I know things... A lot of things.
 
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Posts: 2,992
Re: No Fuel Prime / No Throttle Body Movement

I thought I'd mention it since it's one way for the ECU to be offline while the motor can still be cranked.
dpapavas is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Suzuki GSX-R Motorcycle Forums Gixxer.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Ooops, Switched Fuel Pump & Throttle Position Sensor Connectors! Soarer 06-07 GSX-R600/750 0 06-06-2017 12:26 PM
Deceleration Fuel Cutoff and the herky jerky throttle TheCunningMan 06-07 GSX-R600/750 24 09-08-2015 01:06 AM
How To Wheelie 101 (long) Riding Skills 8 10-16-2010 06:46 AM
00 750 fuel pump & throttle body problem HELP!! gixxerod 01-03 600 and 00-03 750 5 09-26-2010 06:36 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome