FRP

📖 YOUCANIC Automotive Glossary

FRP (Fuel Rail Pressure) is the measured fuel pressure in the common rail supplying fuel to all injectors. In PFI systems, FRP is typically 35-65 PSI. In GDI systems, the low-pressure stage delivers 40-80 PSI from the tank pump, while the HPFP boosts it to 500-3,000+ PSI. Diesel common rail operates at 25,000-30,000+ PSI. The ECU monitors FRP through a dedicated sensor and adjusts pump output to maintain target pressure.

Compare actual to commanded pressure in the YOUCANIC UCAN-II live data — a significant gap indicates delivery problems. DTCs: P0087 (Too Low), P0088 (Too High), P0190-P0194 (Sensor codes).