Tmax Warning light

Chat about all makes of Maxi scoot here!
MrGrumpy
Benefactor
Posts: 7252
Joined: Wed Apr 08, 2009 9:50 pm
Current Ride: ADV350 Tmax mk3
Location: Cumbria

Tmax Warning light

Post by MrGrumpy »

The 'Engine Trouble Warning Light' on my TMax mk3 has started coming on....not all the time, but comes on for a bit, then goes out for while, then comes back on - for no obvious reason. The engine seems to be running fine.
Then handbook says it comes on when a circuit monitoring the engine develops a fault - rather than the engine itself having a fault!

Anyone seen this themselves? Any idea whats going on?

DougL
Global Moderator
Posts: 582
Joined: Tue Oct 05, 2010 10:19 pm
Current Ride: R1200GS
Location: Belfast

Re: Tmax Warning light

Post by DougL »

Check that the battery isn't being overcharged. Get a multimeter and see if the voltage across the battery is less than 15 V. If above then your voltage regulator is toast. Not sure if this is the problem, but it could be. You can also check the diagnostics via the dash. I can email you the service manual if you'd like.

User avatar
Funkycowie
Admin
Posts: 4665
Joined: Sat Mar 21, 2009 1:23 pm
Current Ride: Honda NC750x
Location: Essex, UK.

Re: Tmax Warning light

Post by Funkycowie »

or you can check out the diagnostics codes and download the service manual from the TMaxI Muppets forum on here :D
ImageImageImageImage
Past Bikes: Piaggio B125, Gilera Nexus 500, TMax MK3 in White, TMax MK3 in Yellow, TMax MK3 in Yellow, Honda NC750x in Blue...

Liam
Benefactor
Posts: 1275
Joined: Thu Aug 06, 2009 1:22 am
Current Ride: Tmax 560 Vespa Sei Giorni
Location: South Normanton. The crap bit of lovely Derbyshire

Re: Tmax Warning light

Post by Liam »

Is your speedometer working ok?

Could be a warning light to say the sensor is on its way out.

MrGrumpy
Benefactor
Posts: 7252
Joined: Wed Apr 08, 2009 9:50 pm
Current Ride: ADV350 Tmax mk3
Location: Cumbria

Re: Tmax Warning light

Post by MrGrumpy »

Liam wrote:Is your speedometer working ok?

Could be a warning light to say the sensor is on its way out.
Everything is apparently working totally fine - although there was a peculiarity when I came back from Xmas when the battery had partially lost charge - it would turn but not enough volts to make it run. Recharged battery and it was fine. I do wonder if there is some small electrical problem giving odd problems.

Used to have speedo failures on older TMaxs!

MrGrumpy
Benefactor
Posts: 7252
Joined: Wed Apr 08, 2009 9:50 pm
Current Ride: ADV350 Tmax mk3
Location: Cumbria

Re: Tmax Warning light

Post by MrGrumpy »

Funkycowie wrote:or you can check out the diagnostics codes and download the service manual from the TMaxI Muppets forum on here :D
I've already got a service manual I downloaded a while back. Could be written in Icelandic for all the sense it makes to me! I think it says that if the light comes on, the fault code will be displayed on the clock when the engine is switched off - I'll have to try and look for that tomorrow.
However, the manual says the light might flash - presumably quite rapidly - or come on and stay on. But mine comes on for a bit and goes off again, which doesn't seem to be something envisaged by the designers!

Thanks all

User avatar
TmaX9
Posts: 633
Joined: Thu Apr 09, 2009 11:15 pm
Current Ride: 04 and 54 X9 500 Evos
Location: Fylde Coast Lancashire

Re: Tmax Warning light

Post by TmaX9 »

It lights when the output from any sensors goes outside of tolerance, so can easily be influenced by under or over voltage in the system generally.
This can be either a battery developing a dead cell which totally 'confuses' the regulator, or the regulator itself is failing, and it could also be poor battery terminal connections or a bad earth on one of the main grounding points to the engine or frame.
These sort of problems don't always store an error code as they are inconsistent and a fault has to register for a while before it is stored in memory just to avoid over storage of minor glitches caused by human interference (tinkering with the electrics).

MrGrumpy
Benefactor
Posts: 7252
Joined: Wed Apr 08, 2009 9:50 pm
Current Ride: ADV350 Tmax mk3
Location: Cumbria

Re: Tmax Warning light

Post by MrGrumpy »

Latest news is that I've managed to get it to display an error code - 21 - Coolant temperature Sensor open or short circuit.
There is another big clue that the problem is in this area in that the water temperature gauge is now reading Maximum! This has only happened today - until now it has been reading normally. In addition, since Xmas, I've kept thinking that I can hear the cooling fan working as if the engine was getting warm, so it does look like the problem is in the water temp sensor.

How easy or hard this is to fix I've no idea - it is booked in for a service this week anyway.

User avatar
Funkycowie
Admin
Posts: 4665
Joined: Sat Mar 21, 2009 1:23 pm
Current Ride: Honda NC750x
Location: Essex, UK.

Re: Tmax Warning light

Post by Funkycowie »

The Americans call it TMax fever.. hopefully its not that though as that requires a new fuel pump, can't think why right now.

Maybe thermostat?


EDIT: I remembered incorrectly, its not TMax fever...
ImageImageImageImage
Past Bikes: Piaggio B125, Gilera Nexus 500, TMax MK3 in White, TMax MK3 in Yellow, TMax MK3 in Yellow, Honda NC750x in Blue...

MrGrumpy
Benefactor
Posts: 7252
Joined: Wed Apr 08, 2009 9:50 pm
Current Ride: ADV350 Tmax mk3
Location: Cumbria

Re: Tmax Warning light

Post by MrGrumpy »

Funkycowie wrote:The Americans call it TMax fever.. hopefully its not that though as that requires a new fuel pump, can't think why right now.

Maybe thermostat?


EDIT: I remembered incorrectly, its not TMax fever...
You're confusing me! Especially as I've just had a new fuel pump on the baby Burgman!!

Post Reply