DTC P0191: 00 Fuel Pressure Sensor Circuit Range/Performance Problem: Notes

DTC P0191:00 DETECTION CONDITION AND POSSIBLE CAUSES (SKYACTIV-G 2.0, SKYACTIV-G 2.5)

DTC P0191:00	Fuel pressure sensor circuit range/performance problem
DETECTION CONDITION	The difference between the actual and target fuel pressure is equal to or more than the specification, even though the fuel pressure feedback amount is maintained low or high. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Stops high pressure fuel pump control Limits intake air amount
POSSIBLE CAUSE	Air suction in fuel line due to fuel is runout High pressure fuel pump connector or terminals malfunction Fuel pressure sensor connector or terminals malfunction PCM connector or terminals malfunction Fuel pressure sensor malfunction Insufficient fuel pressure (low pressure line) Fuel injector malfunction High pressure fuel pump malfunction Relief valve (built-into high pressure fuel pump) malfunction PCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

RELATED PIDS

Item (definition)	Unit/Condition	Definition	Condition/Specification (Reference)
FUEL_PRES	KPa {MPa}, mBar {Bar}, psi, in H20	Fuel pressure	Displays fuel pressure
FUEL_PRES	V	Fuel pressure	Fuel pressure is 3.0 MPa {31 kgf/cm² , 435 psi}; Approx. 0.92 V Fuel pressure is 4.8 MPa {49 kgf/cm² , 696 psi}: Approx. 1.17 V
LOAD	%	Engine load	Idle (after warm up): Approx. 16.07% Racing (engine speed is 2, 000 RPM): Approx. 14.51% Racing (engine speed is 4, 000 RPM); Approx. 21.17%
RPM	RPM	Engine speed	Displays engine speed