DTC P0191-84: Fuel Rail Pressure Sensor Circuit Range/Performance Bank 1 - Signal below allowable range: Action

NOTE: Operational requirements needed to allow the monitor to be fully tested. Drive the vehicle over 3 drive cycles (engine on/off) across varied driving conditions including high torque to confirm the repair

Check powertrain control module for fuel pressure related DTCs and refer to relevant DTC index
Diagnosis of this DTC may require using the manufacturer approved diagnostic system check datalogger signals
- 0x0324 Fuel Rail Pressure Sensor - Volts
- 0x03DC Fuel Rail Pressure - Desired - KPa
- 0xF423 Fuel Rail Pressure - KPa
- 1. Set the engine running
- 2. Monitor fuel rail pressure
- 3. Set the ignition to OFF. Fuel rail pressure should decrease
- 4. If the fuel rail pressure does not decrease possible stuck valve in fuel pump
Refer to the appropriate System Wiring Diagram(s) and check the rail pressure sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance
Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
Check and install a new fuel rail pressure sensor as required
Check fuel pump - high pressure for mechanical integrity
- Fuel volume control valve
Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest