#
DTC P0191 [MZR-CD (RF Turbo)]

BME010200100W35

DTC P0191 | Fuel pressure sensor circuit performance problem
--- | ---
DETECTION CONDITION | • PCM monitors fuel pressure in common rail from fuel pressure sensor while engine is running. PCM calculates difference between actual fuel pressure and target fuel pressure. If pressure difference exceeds preprogrammed criteria, PCM determines fuel pressure sensor circuit performance problem.
POSSIBLE CAUSE | • Fuel pressure sensor malfunction • Suction control valve malfunction • Clogged fuel line • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to next step.
No | Go to next step.
2 | FOLLOW OTHER DETECTED DTC FIRST • Turn engine switch to OFF. • Start engine. • Have P0091, P0092, P0192, P0193 been detected? | Yes | Go to applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Go to next step.
3 | INSPECT FUEL PRESSURE SENSOR • Inspect fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Replace common rail, go to Step 6. (See SUPPLY PUMP REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to next step.
4 | INSPECT SUCTION CONTROL VALVE • Inspect suction control valve. (See SUCTION CONTROL VALVE INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Repair supply pump, go to Step 6. (See SUPPLY PUMP INSPECTION [MZR-CD (RF Turbo)].)
No | Go to next step.
5 | INSPECT FUEL LINE • Turn engine switch to OFF. • Inspect for clogs in following fuel lines for each cylinder:

  - Common rail and fuel injector.
  - Common rail and fuel tank.

• Is there any malfunction?
Yes
Repair or replace suspected fuel line, go to next step.
No | Go to next step.
6 | VERIFY TROUBLESHOOTING OF DTC P0016 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from PCM memory using WDS or equivalent. • Start engine. • Is same DTC present? | Yes | Replace PCM, go to next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Is there any DTC present? | Yes | Go to applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.