Mazda 6 - Dtc P0191

F2–86
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0191
B6E407000100117
10 VERIFY AFTER REPAIR PROCEDURE
• Perform the Repair Verification Drive Mode.
(See F2–39 OBD DRIVE MODE.)
• Are any DTCs present?
Yes Go to the applicable DTC inspection.
(See F2–40 DTC TABLE.)
No DTC troubleshooting completed.
STEP INSPECTION ACTION
DTC P0191 Fuel pressure sensor range/performance problem
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 any one 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 determines that there is a
malfunction in fuel pressure sensor range/performance problem.
— 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, the PCM determines that there is
a malfunction in fuel pressure sensor range/performance problem.
Diagnostic support note
• The MIL does not illuminates.
• The DTC is stored in the PCM memory.
POSSIBLE
CAUSE
• Fuel pressure sensor malfunction
• Suction control valve malfunction
• Clogged fuel line
• PCM malfunction