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DTC P0191 [MZR-CD (RF Turbo)]

BME010200102259

DTC P0191 | Fuel pressure sensor range/performance problem
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DETECTION CONDITION | • The PCM monitors the fuel pressure in the common rail and input signal from the fuel pressure sensor while the engine is running. If all of the following conditions is met, the PCM determines that there is malfunction in the fuel pressure sensor range/performance problem.

  - The PCM calculates the difference between the actual fuel pressure and the target fuel pressure. If the pressure difference more than 2 MPa {20 kgf/cm 2, 290 psi}.
  - The PCM monitors the input signal from fuel pressure sensor. If the difference between the maximum and minimum voltage of the fuel pressure sensor is less than 0.015 V.

Diagnostic support note
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Fuel pressure sensor malfunction • Suction control valve malfunction • Clogged fuel line • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the WDS or equivalent to the DLC-2. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the PENDING CODE for this DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Perform the "INTERMITTENT CONCERN TROUBLESHOOTING". (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD (RF Turbo)].)
4 | INSPECT FUEL PRESSURE SENSOR • Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Replace the common rail, go to Step 7.
No | Go to the next step.
5 | INSPECT SUCTION CONTROL VALVE • Inspect the suction control valve. (See SUCTION CONTROL VALVE INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Repair the supply pump, go to Step 7.
No | Go to the next step.
6 | INSPECT FUEL LINE • Turn the engine switch off. • Inspect for clogging in the following fuel lines for each cylinder:

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

• Is there any malfunction?
Yes
Repair or replace the suspected fuel line, go to the next step.
No | Go to the next step.
7 | VERIFY TROUBLESHOOTING OF DTC P0191 COMPLETED • Make sure to reconnect all disconnected connectors. • Start the engine. • Is the PENDING CODE for this DTC present? | Yes | Replace the PCM, go to the next step.
No | Go to the next step.
8 | VERIFY AFTER REPAIR PROCEDURE • Perform the Repair Verification Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.