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Speedometer - slow/sluggish to register speed

Hi, I have a 1995 Toyota MR2 (not an import). I have recently replaced my original car audio system with a Sony audio system and had a new ariel fitted. The work was done in stages with the audio work done first (with no apparent effect on the rest of the car). However, when the car electrician replaced the ariel it initially blew the fuse on the speedometer. Apparently Toyota had the ariel wired through the ECU car computor. He then wired the ariel through the car ignitian. As a result everything works apart from I am left with a sluggish speedometer, which reads correctly - but it takes too long to register! At speeds over 50 mph (3rd gear and around 6.000 rpm usually means I am doing speed approx 70 mph -the speedo now is only just climbing over 50mph). It is booked in to be looked at obviously, but I would appreciate any advice for the electrician who has worked on MR2 's before and never had this problem!! I am concerned that the ECU could be damaged in the process of all this replacing of parts.

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In situations like that, the quickest way to diagnose that problem is to install a "good" speedo and see what happens. If it works fine, problem solved, if not, ECU or wiring.

Posted on Jul 07, 2009

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Posted on Jan 02, 2017

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