The 2010 Toyota Yaris does not have a dedicated fuel pump relay. Instead, it is progRammed directly into the ECU, which uses a method known as c/opn. This stands for "Circuit Opening Relay". Unfortunately, there's very little that You can do in terms of a fix here, without replacing the entire ECU itself. The good (maybe) news is that if You think You have an issue with the relay, You likely don't. The bad news (probably) is that it's more likely an issue with the fuel pump itself. Alternatively, You may have an issue with the fuel pressure sensor, which is a fix that's slightly more easily stomached. While a relay swap would be preferable to this, it sadly is not an option on Your Yaris.
Amanda A
July 16, 2020
The 2010 toyota yaris fuel pump relay can be found in the fuse box under the hood, on the relay panel
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