The FPR (fuel pressure regulator) sets the correct pressure in the rail as a function of engine, loading and maintains it at this level. If the rail pressure is excessive, the pressure control valve opens and a portion of the fuel returns from the rail to the fuel tank via a collector line. If the rail pressure is too low, the pressure control valve closes and seals off the high pressure stage from the low pressure stage. In case of the fuel pressure regulator failure, the engine symptoms will occur the shut down and the starting impossible.
If the fuel rail pressure is short circuit to battery line or open circuit during two driving cycles, this code will be set. If the engine speed is not below 500 rpm within 1.5 sec. after the ignition switch OFF, during driving cycles, this code will be set.
DTC NO.
Detecting Condition
Possible Cause
C 003
C 018
C 019
?C 003
Error is recognized if the engine speed is not below 500 rpm within 1.5 sec. after the ignition switch off (Rail pressure ragulator valve is open, but the injector is driving)
? C 018
Short circuit to battery line
? C 019
? Short circuit to ground
? Wire broken
? Too high temperature in power stage
? Engine Condition : RUN
? Fuel Limit : YES
? Fuel Cut : NO
? EGR OFF : NO
? MIL : YES
? Open or short in circuit
? Injector
? Fuel regulator
? ECM
Test Condition
Normal parameter (at 20?(68?))
Resistance
2.07 ~ 2.53 ?