DTC P0191 Fuel Rail Pressure Sensor Circuit Range / Performance
The ECM monitors the internal fuel pressure of the common rail using the fuel pressure sensor, and controls the suction control valve to regulate the common rail pressure to the target pressure determined by the ECM. The pressure sensor is a semiconductor that varies its electrical resistance when pressure is applied to its silicon chip. This sensor outputs a voltage in proportion to the common rail fuel pressure.
|DTC Detection Condition
|Voltage output of the fuel pressure sensor for the common rail is out of the standard range
(1 trip detection logic)
|Fuel pressure sensor
If DTCs P0087, P0190, P0192, and P0193 are output simultaneously, the manifold absolute pressure sensor circuit may be open or short. Perform troubleshooting for these DTCs first.
|1.CHECK OTHER DTC OUTPUT
Connect the intelligent tester to the DLC3.
Turn the ignition switch on (IG) and turn the tester ON.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Display (DTC Output) Proceed to P0191 A P0191 and other DTCs B
If codes other than P0191 are output, perform troubleshooting for those DTCs first.