Vespa et4 125 2010
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Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Thu Jan 14, 2021 3:33 am quote
So I reckon the ecu is fried. I get a single red flash even with the originalservice key . The starter doesn't even click there is nothing also the horn nothing not even a click .Also the rear brake light doesn't work the bulb is ok and I've cleaned both brake leaver switches.
Are they all connected I've replaced both fuses buy the battery and have a new battery .
There aren't any other fuses I've missed is there ?
Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Thu Jan 14, 2021 3:40 am quote
I lied its 2002 not a 2010
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1221
Location: Toronto
Thu Jan 14, 2021 4:37 am quote
This doesn't necessarily sound like an ECU problem to me. An ET4 would have a CDI and carb?

When you put in the key, the indicator light should blink once and then stay off. If I understood correctly, that's what yours is doing - so it sounds fine.

Starting with a new battery is good.

Are you sure the fuses are good? You checked them for continuity using a meter? You said you replaced "both" - are you sure you are looking at the right ones? There should be a wiring diagram in wiki on this site to check if there are other fuses or to chase the electrical fault.

From your other posts, I gather the bike is new to you and you've never had it running yet? You said there some lights were working, so has it gotten worse now?
http://modernvespa.com/forum/post2445783?highlight=#2445783
Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Thu Jan 14, 2021 4:43 am quote
Yes its new to me and no I've never had it started . Yes new fuses and both are good . I was wondering if it only has the two fuses or are there any more hidden away.
The light only flashes once and the light is red not green as I would expect .
Never had the horn working either would that be connected?
Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Thu Jan 14, 2021 4:46 am quote
And yes the lights work side dipped and main . Back light works but now brake light .
Indicators work .
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1221
Location: Toronto
Thu Jan 14, 2021 5:32 am quote
Joe Dale wrote:
Yes its new to me and no I've never had it started . Yes new fuses and both are good . I was wondering if it only has the two fuses or are there any more hidden away.
The light only flashes once and the light is red not green as I would expect .
Never had the horn working either would that be connected?
Flashing only once is normal / good. Red light is good (it doesn't change color - indicator light is only red or off).

I doubt if the horn is somehow part of the starting circuit. But it not working is strange, and could be pointing to a burned out fuse.

The wiring diagram is here:
https://manuals.wotmeworry.org.uk/Vespa/ET4/

I only see two fuses (7.5A each), which is fewer than I'd expect. But I guess if that's what the diagram says and what you are seeing, then it probably is right.
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1221
Location: Toronto
Thu Jan 14, 2021 5:34 am quote
Joe Dale wrote:
And yes the lights work side dipped and main . Back light works but now brake light .
Indicators work .
The brake lights need to work to start the bike. In case this is your starting problem: you need to hold down a brake lever at the same time as pressing the starter button.

Make sure the brake lever you are holding down actually activates a brake light. It sounds like yours are not, so you need to sort that out first. Could be the brake light switches are not working.
Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Thu Jan 14, 2021 5:41 am quote
Well thats one thing the fuses are 15amp rather than 7.5
Addicted
2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
Joined: 18 Feb 2017
Posts: 664
Location: Deepinnaharta, Texas
Thu Jan 14, 2021 8:16 am quote
Greetings:

Fortunately for me, I've had no trouble with the electrical system on my 2002 ET4. But I do know there are 2 fuse locations. One is clipped to the battery box cover astern, while the other lives under the left plastic cover of the leg shield. If someone installed heavierer fuses, beware a foolish P. O. "workaround" for a wiring short.


If fuses and wiring are good, I would check the starter by direct hot-wiring from a battery. If it spins, the relay is the next suspect. Handlebar buttons have been known to fail as well. The ET is light, nimble and a lot of fun, even pretty quick with Malossi's help. Good luck!
Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Thu Jan 14, 2021 9:17 am quote
Wheelman-111 wrote:
Greetings:

Fortunately for me, I've had no trouble with the electrical system on my 2002 ET4. But I do know there are 2 fuse locations. One is clipped to the battery box cover astern, while the other lives under the left plastic cover of the leg shield. If someone installed heavierer fuses, beware a foolish P. O. "workaround" for a wiring short.


If fuses and wiring are good, I would check the starter by direct hot-wiring from a battery. If it spins, the relay is the next suspect. Handlebar buttons have been known to fail as well. The ET is light, nimble and a lot of fun, even pretty quick with Malossi's help. Good luck!
I didn't know about the other fuses thanks I'll check it out tomorrow .
Yes once its up and running ill be getting a unrestricted ecu . Is there a restriction in the exhaust ?
Addicted
2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
Joined: 18 Feb 2017
Posts: 664
Location: Deepinnaharta, Texas
Thu Jan 14, 2021 9:32 am quote
Greetings:

There was no restriction on my U.S.-market 150, and I'd expect neither electronic or exhaust restrictions on 125cc class bikes in France, but I can't say for sure. The Malossi 187cc kit transforms the bike, even starting with 150cc. I didn't buy the ECU for mine, speed appears to be aerodynamic drag-limited. With variator, clutch and transmission up-gear, 73MPH so far at 9000 RPM.
Addicted
GTS 250ie Super, Italjet Velocifero, Scarabeo 150, S50, ET4, ET2
Joined: 22 Nov 2016
Posts: 615
Location: Winston-Salem, NC
Thu Jan 14, 2021 9:36 am quote
The Kill switches do die on these.
Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Thu Jan 14, 2021 9:54 am quote
Wheelman-111 wrote:
Greetings:

There was no restriction on my U.S.-market 150, and I'd expect neither electronic or exhaust restrictions on 125cc class bikes in France, but I can't say for sure. The Malossi 187cc kit transforms the bike, even starting with 150cc. I didn't buy the ECU for mine, speed appears to be aerodynamic drag-limited. With variator, clutch and transmission up-gear, 73MPH so far at 9000 RPM.
I wasn't going to keep it but after I've got it running I'm starting to like it . Now lol
Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Thu Jan 14, 2021 9:55 am quote
Pinkscooter wrote:
The Kill switches do die on these.
That will be next after the fuses thanks
Member
Et4
Joined: 05 Jan 2021
Posts: 11
Location: Nantes France
Fri Jan 15, 2021 7:56 am quote
Yes guys it was two things .
One the fuse holder by the battery was broken and not working .so I made something just to make it work .
2 found the 2 other fuses and one was blown . Got it firming so all good .
Thank you guys 😊
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