willihofmann68

Yaris Hybrid Engine Stalling

I'm having trouble with my 2013 Toyota Yaris hybrid. It sometimes won't start, and occasionally stalls at idle. The check engine light is on, and it runs rough when it does start. I'm also getting worse fuel economy. There are error codes stored. Could a bad fuel pump cause this?

A 2013 Toyota Yaris hybrid is experiencing starting issues, stalling at idle, rough running, and poor fuel economy, with the check engine light on and error codes stored. These symptoms suggest potential fuel delivery problems, possibly due to a bad fuel pump or electrical issues like a faulty relay or corroded connectors. It is recommended to check the electrical connections with a multimeter for voltage and continuity, and consider professional diagnostics to pinpoint the exact cause. Ultimately, a loose fuel pump connector was identified and repaired, resolving the issue.

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4 comment(s)

Those symptoms do suggest fuel delivery problems. Before replacing the fuel pump, have you checked the simple things? A bad fuel pump relay or even a corroded connector at the pump can act like a failing pump. With the hybrid system, correct voltage is very important. What have you checked so far? That will help narrow things down.

I've looked at the wiring and connectors, but I haven't thoroughly tested the cable or plug connection. How should I test the electrical connections to rule that out?

Given it's intermittent and there are error codes, a loose or corroded connection is likely, especially since the car is older. A multimeter is what you need. Check for voltage at the fuel pump connector when starting, and check the ground connection for good continuity. A voltage drop test on the wiring can find hidden corrosion inside the wires. Because of the hybrid system, I'd suggest professional diagnostics. It can prevent electrical problems and find the exact cause. If it is a bad fuel pump or just a loose connector, the repair might be around 95€.

Thanks for the advice. After checking the connections, the shop found a bad connector and the fuel pump connector was loose. The repair was 95€ like you said.

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TOYOTA

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YARIS