The battery failed and all the systems shut down. My garage (not a Toyota specialist) say the alternator belt was very loose, which they found suspicious. The battery isn't being charged by the engine, but they can't tell whether it's the alternator or the ECU that's at fault. If it is the ECU, they say they may not be able to code it.
Has anyone else had a similar problem, or could shed some light for me on the workings of the alternator and ECU? It's all Japanese to me!
What happens when a fully-charged battery is attached?
If it's just that the alternator is not charging the battery (and all the electrical equipment), then obviously the battery will eventually stop supplying power to the ECU, lights, etc, and your Granvia will fail. If it's just a loose fan-belt, then you're in luck: just tighten it up (you have to slacken the bolt that locks the pulley in place - search for how to do this in the forum). It may be your alternator has failed - it can be replaced (it happened to me too!) at a cost of just over £100, again search the forum for the details of how to test the alternator. Or maybe the battery is past its lifetime, though I'd not expect this as once the engine is started, the alternator should supply all the required power to keep the Granvia running.
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