Speedo sensor issue

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Cozzamozza
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Speedo sensor issue

Post by Cozzamozza » 09/10/17 23:14

Hi All,

First time posting, tried to search and have been googling for a day but not found what I need! Any help is appreciated. So I'm borrowing my dads MK2 1992 G-limited import, gleaming white, but the speedo (mph) hasn't worked for some time. I cannot confirm if it ever worked as a mph speedo or not. And it's rumoured there has been a gearbox change at some point.

Looking in the engine bay I've found some loose connections. One of which is at the top side of the gearbox, 3 pins (male), perhaps for cruise control models or?. I have a 2 pin (female) connector in the loom below the fuse box, which has been taped up, but can reach the 3 pin connector, or where I think the speed sensor should be from diagrams I've seen? And two misc connections I'm curious about!

Topside of gearbox, viewing from nearside
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Corroded bracket, does the bracket serve as an earth? This is by the fuse box
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2 pin connector by fuse box
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Two misc wires coming out of the loom by what I assume is the thermostat housing
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peteV6R5
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Re: Speedo sensor issue

Post by peteV6R5 » 09/10/17 23:56

top of gearbox is the top of the speedo drive. you need to connect the associate plug that must be free to it. electronic pulse driven speedo from REV2 onwards
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Cozzamozza
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Re: Speedo sensor issue

Post by Cozzamozza » 11/10/17 20:44

Ah good that is the sender then?

Any idea what each of the 3 pins do?

As my free connector only has 2. There's a chance the engine and loom were also changed..

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Re: Speedo sensor issue

Post by Gazza_DJ » 13/10/17 12:08

Are you sure it's an import? From the very limited view of the valve cover / exhaust manifold that looks like a 3SFE, which was never available in Japan - only Rev1 UK cars. Might be wrong, can't see much of the engine!
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Re: Speedo sensor issue

Post by jimi » 13/10/17 12:32

Was the FE speedo not cable driven?

EDIT
Checked the EPC and it appears they the same as the 3S-GE, Rev1 cable Rev2 onwards electric
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Re: Speedo sensor issue

Post by Gazza_DJ » 13/10/17 20:55

jimi wrote:
13/10/17 12:32
Was the FE speedo not cable driven?

EDIT
Checked the EPC and it appears they the same as the 3S-GE, Rev1 cable Rev2 onwards electric
The gearbox it would have been attached to from the factory would have been, OP has stated it may have had a gearbox change at some point as well. Look at the valve cover / plate though - that looks exactly like the FE one. Gen2 3SGE looks quite different.
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Re: Speedo sensor issue

Post by Cozzamozza » 14/10/17 10:05

So there may have been an engine swap as well then!

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Re: Speedo sensor issue

Post by Gazza_DJ » 14/10/17 11:19

Post a photo of the engine bay to confirm.
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Re: Speedo sensor issue

Post by Cozzamozza » 16/10/17 19:22

The timing belt cover says your 3S-FE guess is spot on. This car..

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Re: Speedo sensor issue

Post by Gazza_DJ » 17/10/17 11:00

Strange swap to do that, a Rev2 G Limited would have had a 3SGE originally!
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Re: Speedo sensor issue

Post by jimi » 17/10/17 11:52

May have been cheap available replacement for a dead engine. I'm wondering if the car is really a rev1 (mechanically driven speedo) fitted with a later FE engine (electrically driven speedo) hence no matching plug for the gearbox sensor? Easy enough to find out when the car was built from the VIN number
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