Like Leighfos’s post in the Fiesta forum on 25 May 09, the speedo on my wife’s Fusion 1.4 (53 plate) bounces, wobbles, and overreads, then settles down for a while, before starting off bouncing again.

I am fairly sure that the Fusion has an electronic speed sensor fitted to the transmission in place of an old-style speedometer cable (but there is no Haynes manual for the Fusion – they say to use the Fiesta Mk5 one instead).

The bouncing speedo problem may have started when I changed the clutch and had to disconnect all the cables etc from the transmission/gearbox area. I had difficulty disconnecting the speedo cable connector, so I removed the whole sensor (as if an old-style cable). The sensor had been bound in foil tape, which I unwound before removing the sensor. I rebound the sensor with the same tape on re-assembly.

I suspect the bouncing is because either the sensor is dirty or damaged, the cable connections are dirty or broken, or the tape binding is inadequate. I have briefly tried re-attaching the cable connections and re-binding the sensor, but got no improvement.

Before I try replacing the sensor itself, I would be grateful if anyone had any suggestions, or knew how to find what is really wrong?

Thanks

JohnieBoy

[quote name='Johnie Boy' post='33818' date='Jul 22 2009, 02:05 PM']Like Leighfos’s post in the Fiesta forum on 25 May 09, the speedo on my wife’s Fusion 1.4 (53 plate) bounces, wobbles, and overreads, then settles down for a while, before starting off bouncing again.

I am fairly sure that the Fusion has an electronic speed sensor fitted to the transmission in place of an old-style speedometer cable (but there is no Haynes manual for the Fusion – they say to use the Fiesta Mk5 one instead).

The bouncing speedo problem may have started when I changed the clutch and had to disconnect all the cables etc from the transmission/gearbox area. I had difficulty disconnecting the speedo cable connector, so I removed the whole sensor (as if an old-style cable). The sensor had been bound in foil tape, which I unwound before removing the sensor. I rebound the sensor with the same tape on re-assembly.

I suspect the bouncing is because either the sensor is dirty or damaged, the cable connections are dirty or broken, or the tape binding is inadequate. I have briefly tried re-attaching the cable connections and re-binding the sensor, but got no improvement.

Before I try replacing the sensor itself, I would be grateful if anyone had any suggestions, or knew how to find what is really wrong?

Thanks

JohnieBoy[/quote]




Have another look at the cable, you may have kinked it causing it to flick as it turns.
I know you are probably sick working on it, but i'm guessing this might be the problem.

Best of Luck Paul-eb

Thanks Paul-eb

But it is not a "cable" that turns in a sleeve - it is an electrical wire ending in a plug connector (that I couldn't see how to separate so I had to take the whole sensor out). The wire may be broken and making only intermittent connection (but I don't think so). I wonder more if the foil tape is not shielding the sensor properly (or something like that)!

Cheers

JohnieBoy

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Have another look at the cable, you may have kinked it causing it to flick as it turns.

Best of Luck Paul-eb