What's the black box under the throttle pot?

Captain Jack · Post by **Captain Jack** » Sun Dec 20, 2009 6:13 pm

As subject really...

During the weekend I noticed that one of the thick wires that bolts to one of the er... bolts on this little black box under the throttle position pot is charred and the plastic around the bolt melted due to arcing (it's the smaller bolt). The bolt itself is loose, I tried tightening the nut but this didn't help. It looks like the bolt has come loose inside.

What is this box?? I haven't noticed anything untoward in the car electrical wise. On the side of it says "Relais", which I guess means relays in French. What relay? Glow plug relay? Thought that was inside the ECU? It seems to start fine as well... but I guess HDIs aren't as sensitive to cold as other diesels.

Post by **steve_earwig** » Sun Dec 20, 2009 6:41 pm

I "think" that's the glow plug relay on early HDis. Just going into Service Box for Highlander...

Thisun?

There's two, pre EOBD (598138) and post (598140), I'm guestimating about 35 squid.

Captain Jack · Post by **Captain Jack** » Sun Dec 20, 2009 6:44 pm

That's the jobbie!

Can I take it apart and "fix" the bolt or would I be better off just replacing the thing?

Post by **steve_earwig** » Sun Dec 20, 2009 6:49 pm

I don't know if they're repairable, what we need is a guineapig...

Captain Jack · Post by **Captain Jack** » Sun Dec 20, 2009 6:54 pm

After this weekend, my desire and confidence in diagnosing and repairing issues myself is not what it used to be...

jasper5 · Post by **jasper5** » Sun Dec 20, 2009 9:12 pm

It's fairly common for these bolts/nuts to come loose and arc badly, burning the connections.I would replace the whole box if I was you.

Don't let your confidence take a dent, CJ, it happens to us all, no matter how much experience you have. The car repair business can seriously bite you sometimes.
The thing is, with this being my living I just have to forget the aggro and get on with the next job.There will be more aggro just around the corner.
People don't understand when you give a price for a job that there are hidden problems that the DIY person just doesn't see until they have a go themselves.
I do not intend any criticism of yourself.

Captain Jack · Post by **Captain Jack** » Sun Dec 20, 2009 9:15 pm

Thanks for the kind words, Jasper.

After this weekend, every single bone and muscle in my body is aching. I don't know how people do this every day - they are heros! Of course, it helps having the right tools and knowledge but still...

jasper5 · Post by **jasper5** » Sun Dec 20, 2009 9:23 pm

You're very welcome CJ

I've been doing this job for 40 years come 2nd of march

mjb · Post by **mjb** » Mon Dec 21, 2009 11:53 am

Captain Jack wrote:I don't know how people do this every day - they are heros!

It's working in temperatures like this I can't fathom - I can't touch my dad's tubby in my garage because my tools freeze my hands, the car freezes my hands, everything I do in the garage results in frozen hands! Can't even manage to put a nut on a thread without dropping the ****ing thing 5 times and not even realising

Captain Jack · Post by **Captain Jack** » Mon Dec 21, 2009 11:57 am

Yes, temperature is a killer too. I am still recovering today and am working from home in my bed with my cat.

I don't have a garage (well, my parents do but it's full of junk) so I had to dress up fairly warm. Two pairs of trousers (tracks + jeans on top), loads of upper body clothes including an old but warm winter coat, 2 pairs of socks, a hat and old sheepskin gloves. Kept me relatively warm, but constant hammering helped!

Post by **Welly** » Mon Dec 21, 2009 2:39 pm

Captain Jack wrote:Two pairs of trousers (tracks + jeans on top), loads of upper body clothes including an old but warm winter coat, 2 pairs of socks, a hat and old sheepskin gloves

Reminds me of a Party game

Post by **DaiRees** » Mon Dec 21, 2009 3:51 pm

mjb wrote:It's working in temperatures like this I can't fathom - I can't touch my dad's tubby in my garage because my tools freeze my hands, the car freezes my hands, everything I do in the garage results in frozen hands! Can't even manage to put a nut on a thread without dropping the ****ing thing 5 times and not even realising

Yeah I know what you mean, I'm ashamed to say that I've booked the car in to have the back brakes replaced. Been carrying the new discs, pads and shoes around in the boot for ages, been too busy to to do them but now the MOT's looming and it's just too bloody cold out there!

Post by **steve_earwig** » Mon Dec 21, 2009 5:23 pm

Pah, get out there, it's lovely

(my hand stuck to the garden gate this morning...)

Captain Jack · Post by **Captain Jack** » Mon Dec 20, 2010 6:33 pm

Having some bad troubles starting from cold, takes a good few cranks in the morning to get it going (about 1 minute of on/off cranking). As I never actually got around to fixing this, I think I'll need to get a new relay.

Anyone has one in a decent nick?

Post by **steve_earwig** » Mon Dec 20, 2010 7:11 pm

Which one is yours - there's two, pre-mutlhex and multihex.

406oc.co.uk

What's the black box under the throttle pot?

What's the black box under the throttle pot?

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