Question about 2007 Toyota Yaris

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While strapping the battery into the car i caused a very instantaneous short circuit across the battery. when the job was completed the car would not start and there is a clicking noise from the EFI relay. Can anyone help?

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First, check the charge on the battery. I bet, with any luck, it just ran it dead from the high current. On the other hand, you could have sent a shock to the computer: Best to try charging it, and if it doesn't run, see if you can get someone who has an OBDII sensor (Mechanic, friend, etc) to see if you've got error codes. Best wishes the battery discharged, though!

Posted on May 28, 2011


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I have a Mazda 121 that wont start, I have replaced all the fuses under the bonnet, But when the battery was reconnected the 80 fuse blew straight away... Would the problem be the relay

Unlikely a relay which would have to be very seriously kaput to cause a fuse to blow and even if it was that bad it is only a slim possibility.a fuse would blow.

Clearly there is a short circuit somewhere on one of the circuits protected by that fuse. Check in the vehicle handbook what circuits are supplied by that fuse and begin disconnecting until the fuse goes away.
To save spending money on lots of fuses for testing a headlamp bulb can be connected across the fuse contacts to monitor progress. A short circuit will cause the bulb to be full brightness and when it dims or goes out you have found the faulty circuit.

Alternatively a couple of wires can be fixed to a spare MCB from a consumer unit if you have such a thing...

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