Help Identifying Cable Under Car

[Chrisc201]

Hi,

My niece drives my mk1 eunos 1.8 and the other day advised she'd went over a speed bump and there was a loud noise followed by constant scraping so she hadn't used it again....

I had a look today and there was a thick black metal wire hanging down and scraping along ground, runs along underside of transmission tunnel so assumed perhaps Speedo cable but Speedo is working fine....as is everything else based on a quick spin around the block....

I had the car on a trolley jack, with axle stand, but couldn't get right under to have a good look but stuck phone under for some pictures as attached.

Anyone able to advise what the cable is for such that I can get a replacement ordered up?

Thanks,
Chris

[drumtochty Eddie Cairns]

Could be an earth cable.

If so get it reconnected or replace it with an unbroken one as it will cause problems and may burn out other earth wires if it is not doing it's job.

[iain cooper]

yes I would agree with Eddie, a thick metal cable does sound like an earth.

Iain

[joeytalent]

Is that next to the catalytic converter?

Sent from my ASUS_Z00AD using Tapatalk

[drumtochty Eddie Cairns]

You think it is the wire to the O2 sensor Joey, I'm not convinced it was an earth cable.

[71NotOut Steven Hedley]

I think this was identified as a Japan-only cat temp sensor on Pistonheads?

[drumtochty Eddie Cairns]

Yes they were Mk1 JDM cars only, but that would tend to make the light come on as the circuit is broken unless of course the wires are shorting.

[marshall Marshall Pirrie]

Looks like cat temp probe wiring to me check cat and see if wire has broken of sensor, I've de-cat on our old mk1 and disconnected this sensor and it didn't put any warning light on

[drumtochty Eddie Cairns]

Never done it but there are reports that if the cat overheats, there is a link on the cat that breaks and a light comes on in the dash.

Again reports that it is only on the Japanese Domestic Market Cars

[joeytalent]

Never done it but there are reports that if the cat overheats, there is a link on the cat that breaks and a light comes on in the dash.

Again reports that it is only on the Japanese Domestic Market Cars

I believe it's the heat sensor in the cat - mine has the same wiring hanging down. If the cat overheats, snipping the wire to the heat sensor removes the light from the dash iirc.

[mgrays]

My that took a minute to find .. but here is the wiring and the Eunos cat (on a '94 1800) which shows that wiring.
So yes it is the Japan market only overheated cat warning sensor wiring.
They have caught the wiring loop between the cat and the plug and ripped it off. You just unplug the remaining wire from the socket or you can cut those wire back. The light comes on in the dash if you short the 2 wires together .. so if the wiring is intact and you have the warning light you can just unplug it down at the cat (but the Cat is probably dead and may fail next MOT). That is not an issue here.. just some side info.

Pic also shows how that age of car.. that the front flange of the cat is about 35mm further back so a standard UK/US downpipe has that nice little gap.. and nothing fits (flange angle wrong, bolts at wrong angle etc)