time has come

[Alfetta]

So the V7(3) (2018) has 16K miles under she belt. and now the check engine light has decided to turn on...

Friday was hot here and the bike was in the sun all day.
I fired it up to and it stumbled and died. (check engine light turned on)
I tried on more time with the same result.
So third push on the start button i gave it a blip of fuel to keep things spinning, It still stumbled, gave me a lean pop. and then slow settled down and ran correctly.
The bike ran just fine for the 20 mile journey home.  And ran fine back to work this morning. (light still on)

So i think its time to get the necessary equipment to run diagnostic test.
Q1.  Will a standard auto OBDII reader work with correct interconnect cable ?
Q2.  Would GuzziDialog software and cabling be a better option ?

[faffi]

I cannot answer your questions, unfortunately, but have you checked battery voltage unladen and when cranking? Low voltage can cause all sorts of issues.

[Xander]

So i think its time to get the necessary equipment to run diagnostic test.
Q1.  Will a standard auto OBDII reader work with correct interconnect cable ?
Q2.  Would GuzziDialog software and cabling be a better option ?

I'm not sure about the V7, but I learned that the V85TT just began compatibility with OBDII in 2021 (or '20?) with the E5 (Euro) standard.  I guess that probably applies to Moto Guzzi in general.   
EDIT:  I think the prior system on MG bikes requires a proprietary scanner.

I've gotten an adapter (Amazon ~$8) for my ODBII scanner (16 pins) to the plug on my '21 V85TT (6 pins).  I haven't tried it yet, but I'll do so and report back here if anyone's interested.

Low voltage can cause all sorts of issues.

Very true.  I'm told that on the V85TT low voltage can be a cause of the "startus interuptus" issue which flashes a red warning about the security key instead of starting the brum brum.  I had that issue and charging the battery fixed it.  I've since replaced the battery after testing the charge voltage while running, and I've not had the problem since.

[azccj]

I have the OBD adapter that plugs into my V85tt's red diagnostic plug, and have connected a cheap wireless OBD scan tool into the adapter. It appears to work fine showing fault codes and sensor readings. Also works on my girlfriend's Vespa which uses the same red diagnostic plug.

[Xander]

I have the OBD adapter that plugs into my V85tt's red diagnostic plug, and have connected a cheap wireless OBD scan tool into the adapter. It appears to work fine showing fault codes and sensor readings. Also works on my girlfriend's Vespa which uses the same red diagnostic plug.

What year is your V85TT and her Vespa?

[azccj]

What year is your V85TT and her Vespa?

Both are 2022 models

[Dr. Enzo Toma]

2022 models are Euro5 and have the ISO 19689 6-pin diagnostic plug. OP's 2018 model would be different. Remove the seat to identify the plug, it likely has 3 wires.

[Dr. Enzo Toma]

My scanner says it should be this plug for the V7 III.

[Vagrant]

Odds are the fuel tank over pressurized it and choked it with gas. Next time open the cap and relieve it first.
Guzzling will work and it will let you turn off the O2 sensors that I bet is your CEL problem.

[Alfetta]

Odds are the fuel tank over pressurized it and choked it with gas. Next time open the cap and relieve it first.
Guzzling will work and it will let you turn off the O2 sensors that I bet is your CEL problem.

Guzzling ??  is that some kind of little goose tuner ??   

PS  (2018 OBD is a small three wire plug.)

[Vagrant]

Spell check! Guzzi Dia

[Moparnut72]

Odds are the fuel tank over pressurized it and choked it with gas. Next time open the cap and relieve it first.
Guzzling will work and it will let you turn off the O2 sensors that I bet is your CEL problem.

My V7lll will do this if the tank is full or near full and has been parked in the sun. There is a cure but it has done it so seldom and is not that big an issue so I haven't bothered to address it.
kk

[bronzestar1]

Odds are the fuel tank over pressurized it and choked it with gas. Next time open the cap and relieve it first.
Guzzling will work and it will let you turn off the O2 sensors that I bet is your CEL problem.

That would be my first guess.  I keep my bikes in a storage unit, and since I don't ride them frequently, I tend to keep them topped off when I park them.  When the temps are hot here, I'll crack the gas cap open to let it vent for a few seconds before starting.  Whenever I've done this, there's always been that "psshhh" sound of it depressurizing.  The warmer the weather, the louder and more forceful the sound. 

[Bulldog9]

So the V7(3) (2018) has 16K miles under she belt. and now the check engine light has decided to turn on...

Friday was hot here and the bike was in the sun all day.
I fired it up to and it stumbled and died. (check engine light turned on)
I tried on more time with the same result.
So third push on the start button i gave it a blip of fuel to keep things spinning, It still stumbled, gave me a lean pop. and then slow settled down and ran correctly.
The bike ran just fine for the 20 mile journey home.  And ran fine back to work this morning. (light still on)

So i think its time to get the necessary equipment to run diagnostic test.
Q1.  Will a standard auto OBDII reader work with correct interconnect cable ?
Q2.  Would GuzziDialog software and cabling be a better option ?

Your best bet is to go to Griso.org and follow the link there for the Lonetech cables and adapter, read the info and download the correct programs. There is the GD base program, plus a 'reader' to dowload and 'writer' to upload maps to/from your PC.

The Lonetech cables are Proven and work the first time. People who try to patch and match always have issues.

I bet sitting in the sun, your tank had a ton of pressure build up. GD is a great tool with many functions and tests.