DTC P0191 [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)]

id0102b0819300

DTC P0191

Fuel pressure sensor range/performance malfunction
DETECTION CONDITION
•  The PCM monitors the fuel pressure in the common rail via the fuel pressure sensor when the engine switch is turned to the ON position after the engine has not been run for several hours. If the fuel pressure is not 0 MPa {0 bar, 0 psi}, the PCM determines that there is a fuel pressure sensor malfunction.
POSSIBLE CAUSE
•  Fuel pressure sensor malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
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 repair Information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair 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 M-MDS to the DLC-2.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
(See INTERMITTENT CONCERN TROUBLESHOOTING [WL-C, WE-C].)
4
CLASSIFY FUEL PRESSURE SENSOR MALFUNCTION OR PCM MALFUNCTION
•  Access FRP PID.
•  Turn the engine switch to the ON position (Engine off).
•  Monitor the FRP PID.
•  Is the FRP PID value 0 MPa {0 Bar, 0 psi}[ECT: below 20 °C{68 °F}]
Yes
Go to Step 6.
No
Go to the next step.
5
INSPECT FUEL PRESSURE SENSOR
•  Inspect the fuel pressure sensor.
•  Is there any malfunction?
Yes
Replace the common rail, go to the next step.
No
Go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P0191 COMPLETED
•  Turn the engine switch off.
•  Make sure to reconnect all disconnected connectors.
•  Turn the engine switch to the ON position (Engine off).
•  Clear the DTC from the memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Replace the PCM, go to the next step.
(See PCM REMOVAL/INSTALLATION [WL-C, WE-C].)
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “After Repair Procedure“.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].)
No
Troubleshooting completed.