The P1310 code in your 2023 Toyota Highlander indicates a malfunction in the fuel injector circuit for cylinder 1. This Toyota-specific code signals electrical issues with the injector driver circuit or the injector itself.
Understanding Injector Circuit Faults
The Highlander's direct injection system uses precise injector timing and fuel delivery. P1310 indicates the ECU has detected an abnormality in cylinder 1's injector circuit, affecting fuel delivery to that cylinder.
Common Causes of P1310
- Faulty fuel injector cylinder 1
- Damaged injector wiring
- Corroded injector connector
- ECU injector driver failure
- Ground connection problems
- Injector circuit resistance issues
Symptoms of Injector Circuit Failure
- Check engine light on
- Rough idle
- Misfire on cylinder 1
- Reduced power
- Poor fuel economy
- Possible engine vibration
Direct Injection Considerations
The Highlander uses gasoline direct injection (GDI) which operates at high pressures. Injector circuit issues can affect both fuel delivery and engine performance significantly.