GT250 EFI 2012 Issues arising from Issues

[Callumtrb]

Hi Everyone,

New to Hyosungs and rather puzzled here.

I’ve bought a gt250 a few months ago, in displayed an EFI warning light on startup, which would go away when the motor was running, this was error code 0132, which in my understanding was an o2 sensor fault.

My exhaust was rather rusted through, especially the o2 sensor which the fault was coming from.

I decided to replace the exhaust entirely with another stock one with two new (but used) o2 sensors from a reliable seller. There was no chance of removing the o2 sensor even if i wanted to.

Now I have an array of codes:

0037 – Low Volt O2 2
0032 – High Volt Heater Circuit O2 1
0132 – High Volt OS Circuit O2 1

What’s even more strange, I was driving the bike when the EFI alert started displaying constantly.

I’ve switched back one of the o2 sensors which I know to be working, the faults still did not disappear. Seems rather strange for these new faults, I’m inclined to think this has become an electrical issue, and am hoping someone with a wealth of knowledge could help me out.

The bike appears to drive normally, I’ve gone through contact cleaning connects as I’m aware GT250’s are prone for these issues.

I’ve unplugged the ECU for a few hours and reconnected, still displaying the same faults.

The bike is sitting at 20,000 k’s and is in relatively good condition.

Any help appreciated. 🙂

[♠️ MARCEL]

It sounds silly,  what if you bought all new sensor ? and see if the problem continues?

Also,  check manualsLIB online for your 2012 model to get a service manual, there is a page that allows you to check if the connector near the ECU is breaking up signals ?

I know the 2012 is a DAEWOO with a very large single plug , the 2009-2012 really do have sensetive ECU connector plugs. It is perharps the ECU fault  or the ECU itself is not able to reliable read the harness leading to the sensor.

You can test for example = Purple wire (example) from the O2 sensor connector and test the same color near the ECU plug , to see if the circuit is broken using a multi meter  or if it is acting haywire if you move the harness around  (incase of kinks)

// Meditation doesn't mean you have to sit still....

[Callumtrb]

Not really in a position to buy new o2 sensors sadly, I would rather look at a new bike than spend that kind of money on this one.

The o2 sensors came from a bike I saw myself running with no faults though.

I’ll have a go at checking the ECU, I can’t see anything obvious on the connections but will use a multi meter.

Appreciate the advice.

[Author]

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