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New owner of STI V3, tinkered with dash, now no speedo and intermittent check engine light


foobar
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Hello all, hoping there are some JDM gurus here.

I recently purchased an STi V3 wagon, speed and odo running in km. There's an MPH sticker stuck over the KPH marking on the dash so assumed at some point it had been converted. Someone told me there ought to be a chip behind the dash that converts the KPH to MPH so decided to pop the dash. So after doing that I quickly realised that it seems to be cable driven. It's a real pig to get the cable back onto the dash, in doing so I managed to pull the cable hard enough to disconnect from the gearbox end. I put my girlfriends tiny hands to use and got her to reconnect the gearbox side but it's not easy and whilst it looks connected, I have no speedo or odo right now. Further to this, I now have an engine check light coming on at random. 

The engine check light goes out after first starting the car as expected. Drive a few miles down the road and it comes on, it'll stay on for a little while before going out, a while later it'll be back on, rinse and repeat. There appears to be no pattern to when the light comes on/off although it seems as though if I slow down to 20mph or below, the light goes off. Anyone know if this is likely to be related to not having a speedo/odo connected as the car seems to be running just fine otherwise.

 

 

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if engine light comes on then you need a obd2 reader to see what codes is coming up,plugs in under sterring wheel colume on mine.a macanic once told me if your engine managment light comes on and stays on solid you can drive car,if it flashing on and off you souldn't drive it,but dont think its same flashing as you describe,can get a obd code reader on eBay for £30.

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Doesn't need obd reader if it's a v3 classic. I'll find the link that gives the full description and codes but briefly, under the steering column you will find two black connectors and two green. Connect black to black. Turn ign on and watch the cel flash. Long flash is a ten, short flash is a one. Add them up and that's your code.




Edit: Link for thread.

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7 minutes ago, Scoobyghost said:

Doesn't need obd reader if it's a v3 classic. I'll find the link that gives the full description and codes but briefly, under the steering column you will find two black connectors and two green. Connect black to black. Turn ign on and watch the cel flash. Long flash is a ten, short flash is a one. Add them up and that's your code.

 

 


Edit: Link for thread.

 

 

 

 


 

 

 

why i like it here,i learn something new every day :biggrin:

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The ecu needs a vehicle speed reading especially if it's jdm as the ecu limits the top speed 112 mph .

I'd imagine once you reconnect the speedo you'll loose the eml light issue .

The mechanical speedo drive cable is in 2 sections , the lower section (gearbox end ) should have a thin wire clip to hold the upper section in place .

Is the clip in situ and did you make sure the tab and slot were in line when pushing them together?

Are you sure it's a v3 jdm ?

I thought they switched to electronic speedo drive at v3 . As my v1 sti is mechanical and my v3 uk was electronic .

Keep us posted on how you get on bud .

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Thanks all, things got progressively worse today. Originally the light would come on and a few minutes later be out. I narrowed that down to the light going off whenever the clutch was depressed and RPMs dropped off, but now the light is on all the time.

I've located the plugs and it looks like it's showing 3 faults....

22 - Knock Sensor

14 - Idle control system 

33 - Vehicle Speed Sensor

So, code 33 would be expected. The other 2 I was not expecting. I know what the knock sensor is for, not sure if I should be worried or if that was triggered as a result of me testing as I took it to about 4k with the check light on and power was brutally cut?

I connected up the green plugs (along with black ones) to reset the codes, went for a drive with them connected and the process worked but at stage 8 of resetting the codes, the check light was signalling code 33 only, Came back disconnected the green plugs and read the fault codes again, all 3 fault codes still present. Edit: That said, the check engine light is off right now.

@savage bulldogs It was sold to me as a v3, I'm a scoob noob though, how can I tell for sure? The export cert shows first registration being Jan 97, Serial GF8-021069 with the EJ20 engine.

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They might well have used a different loom for the jdm v3 compared to the v3 uk , after all the use different ratios ,turbos ,engines , trim ect .

As ghost said the model code on the silver plaque located on the n/s front suspension turret, will tell you what it was when it left the factory.

Hopefully if you check the speedo cables are joined properly and make sure all the dash plug connections are ok . You'll find a fault and it will be a cheap fix .

If not Does it have any mods , what grade fuel are you using and has it been mapped?

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20 hours ago, Scoobyghost said:

Do you have the GC8 code that's on the plate under the bonnet?

You should have GC8D4ED.

I have a GF code not a GC (Difference between wagon and saloon?), The code on the plate reads GF8D5ED which I believe makes it a V3 STi 

20 hours ago, savage bulldogs said:

Hopefully if you check the speedo cables are joined properly and make sure all the dash plug connections are ok . You'll find a fault and it will be a cheap fix .

If not Does it have any mods , what grade fuel are you using and has it been mapped?

As far as I am aware or can tell, it's totally standard but who knows on the remap side of things. As for fuel, 97 or 99 RON. I have had to put a drop (being 5 litres) of 95 in it today as the Garages in my village seem to be struggling to get the higher octane right now. Just enough to get into town tomorrow to get some good stuff.

Looks like there really is an intermittent problem with idle control too as on the odd occasion the RPMs are right down on idle. It's going to a local specialist tomorrow for a once over so hopefully a few £s will put all this stuff to bed.

Thanks to all for your help, much appreciated.

 

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