Speed pulse take-off for display unit

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John Barnes - 03 Jun 2006 08:48 GMT

I want to install a speed display unit in a 2002 UK Ford Focus 1.6.
Installation instructions for the unit (Defi VSD BASIS) suggest tapping
into the Speed Pulse (SP) wire going to the ECU but I don't want to do
that as the ECU connections are hidden behind a tamper-proof shield
that I don't want to er... tamper with!

Can anyone suggest another way to tap into the Speed Pulse signal
inside the car (I don't want to run wires through to the engine
compartment). Perhaps the Speed Pulse signal is fed to the radio?

Thanks for any insight you can give.

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ford_technical_ - 03 Jun 2006 10:09 GMT

the speed sigal from the sensor goes to the PCM/ECU from there its on the
CAN BUS system(where the modules 'talk' to other modules)you carnt tap
into it at this point.

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John Barnes - 03 Jun 2006 12:55 GMT

> the speed sigal from the sensor goes to the PCM/ECU from there its on the
> CAN BUS system(where the modules 'talk' to other modules)you carnt tap
> into it at this point.

Sounds promising, but can you give more information please? I have the
Haynes manual but can't relate your suggestion to the information I
find there. Can you give more description or refer me to other sources?

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John Barnes - 03 Jun 2006 13:32 GMT

> > the speed sigal from the sensor goes to the PCM/ECU from there its on the
> > CAN BUS system(where the modules 'talk' to other modules)you carnt tap
[quoted text clipped - 3 lines]
> Haynes manual but can't relate your suggestion to the information I
> find there. Can you give more description or refer me to other sources?

Searching on the web I have located some information on the CAN-BUS and
interfaces to it, but looks like this capability was only provided on
the 2005 and later Ford Focus?

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Tim.. - 04 Jun 2006 16:07 GMT

> the speed sigal from the sensor goes to the PCM/ECU from there its on the
> CAN BUS system(where the modules 'talk' to other modules)you carnt tap
> into it at this point.

A 2002 Focus doesnt have CANBUS.

The signal at the radio (for the speed sensitive volume) is the same as
which that feeds the speedo, and is the usual take-off point for GPS /
Satnav's etc.

Tim..

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John Barnes - 04 Jun 2006 19:01 GMT

> > the speed sigal from the sensor goes to the PCM/ECU from there its on the
> > CAN BUS system(where the modules 'talk' to other modules)you carnt tap
[quoted text clipped - 7 lines]
>
> Tim..

Thanks for that info, Tim.

Looking at the Haynes manual information on connections to the radio, I
have come up with this stab at the connections I need to make:

For the speed pulse signal: White with Green tracer going to pin 445/6
For ground: Black with Yellow tracer going to
pin 443/2
For ignition-switched power: Yellow with Green tracer going to pin
443/3

I'd be grateful if you could confirm these connections are correct.

Thanks,
John

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John Barnes - 09 Jun 2006 10:09 GMT

This post is just to report back and complete the story.

I connected via the radio wiring, essentially as suggested in my last
post, though I used pin 6 on the power plug for ground. The display
works fine and is easy to read. I'm very pleased with it.

Thanks to other posters,
John

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