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No 4th Gear


 
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Andy W



Joined: 03 May 2015
Posts: 368
Location: Islington

PostPosted: Sun Oct 11, 2020 14:10    Post subject: No 4th Gear Reply with quote

Great, I fix one problem and along comes the next!

Driving back from a day out yesterday, I found the engine was revving very high at 60mph and after a bit of investigation found that it was not changing to 4 the gear. This resulted in driving for a couple of hours at 50mph on the motorway.

This morning I checked the auto transmission fluid and with the engine hot and running and it was up to the top mark on the dip stick and a nice red colour.

Can anyone alay my fears of the worst please, things to do or check as I can't think of anything myself.  It was working okay on the way there, but setting off for home it didn't change to 4th even at first.

Cheers, Andy
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1994 LWB Super Exceed L400, Black & Silver
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PostPosted: Sun Oct 11, 2020 14:10    Post subject: Google Ads keep this community free to join!


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Lewis
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Joined: 25 May 2006
Posts: 15668
Location: Huddersfield

PostPosted: Sun Oct 11, 2020 21:05    Post subject: Reply with quote

Check the OD control relay fuse, in the dash fuse box.  (10Amp Red)

It's the one marked (ELC-4).



HTH
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Andy W



Joined: 03 May 2015
Posts: 368
Location: Islington

PostPosted: Sun Oct 11, 2020 22:17    Post subject: Reply with quote

Thanks, I hope it's this simple, will check in the morning,
Cheers
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andyman



Joined: 08 Dec 2012
Posts: 4688
Location: Penrith, Cumbria

PostPosted: Sun Oct 11, 2020 22:39    Post subject: Reply with quote

Also, the temperature sensor on the head signals to the gearbox ECU when the engine is hot enough to allow the gearbox to engage 4th/Overdrive. If there is a faulty sensor, the ECU "thinks" the engine is still cold, so won't allow 4th. To check, simply remove the wire from the sensor, and earth it, thus bypassing the sensor.
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Andy W



Joined: 03 May 2015
Posts: 368
Location: Islington

PostPosted: Tue Oct 13, 2020 16:01    Post subject: Reply with quote

Well that was a pleasant change, checked the fuse as per Lewis suggestion and it was okay, so got slightly bigger pangs of concern. Then had a peep under the intercooler and low and behold there was a blue and white wire just hanging there.  Did a makeshift repair as I had no tools or hand small enough to reach under the intercooler and all the way home from work I could drive at a normal speed at lower revs 😄
Thanks guys - an easy one for a change.
Andy
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