Mazda Mazda6 - Dtc P0191

F2–124
ON-BOARD DIAGNOSTIC
DTC P0191
A6E407001082221
Diagnostic procedure
End Of Sie
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
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 F2–87 DTC TABLE)
No Go to next step.
3 INSPECT FUEL PRESSURE SENSOR
• Inspect fuel pressure sensor.
(See F2–79 FUEL PRESSURE SENSOR
INSPECTION)
• Is there any malfunction?
Yes Replace common rail, go to Step 6.
(See F2–53 SUPPLY PUMP REMOVAL/INSTALLATION)
No Go to next step.
4 INSPECT SUCTION CONTROL VALVE
• Inspect suction control valve.
(See F2–54 SUCTION CONTROL VALVE
INSPECTION)
• Is there any malfunction?
Yes Repair supply pump, go to Step 6.
(See F2–54 SUPPLY PUMP INSPECTION)
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 F2–64 PCM REMOVAL/INSTALLATION)
No Go to next step.
7 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
(See F2–86 AFTER REPAIR PROCEDURE)
• Is there any DTC present?
Yes Go to applicable DTC inspection.
(See F2–87 DTC TABLE)
No Troubleshooting completed.