Mazdamanuals.com

DTC P0191:00 [PCM (SKYACTIV-X)]

Home  id0102u9147600

Note

•  To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

Description	High fuel pressure sensor correlation problem
Detection condition	Determination conditions	•  The two output values from the high fuel pressure sensor are compared and the difference is 8.4 MPa {86 kgf/cm2, 1218 psi} or more for a continuous 3 s.
	Preconditions	•  Battery voltage: 8 V or more*1 •  The following DTC is not detected: ―  Fuel pressure: P0187:00, P0188:00, P0192:00 or P0193:00 *1: Standard can be verified by displaying PIDs using M-MDS
	Malfunction determination period	•  3 s period
	Drive cycle	•  1
	Self test type	•  CMDTC self test
	Sensor used	•  High fuel pressure sensor
Fail-safe function	•  Stops the spill valve control solenoid valve (integrated with high pressure fuel pump) to perform limp-home driving using the pressure on the low pressure side. •  Limits intake air amount
Vehicle status when DTCs are output	•  Not applicable
Possible cause	•  High fuel pressure sensor malfunction •  PCM malfunction
System wiring diagram	•  Not applicable
Connector diagram	•  Not applicable

Function Explanation (DTC Detection Outline)

Repeatability Verification Procedure

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Simulation item table

Function Inspection Using M-MDS

Step	Inspection	Results	Action
1	PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION •  Record the freeze frame data/snapshot data. Note •  Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	PURPOSE: INSPECT FOR OTHER RELATED DTCs •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-X)].) Go to the next step.
		No	Go to the next step.
3	PURPOSE: VERIFY FUEL PRESSURE (LOW-SIDE) MALFUNCTION Note •  Verify the fuel pressure on the low pressure side with the operation of the high pressure fuel pump turned off. •  Bleed the remaining pressure in the fuel line using the following procedure. 1.  Switch the ignition off. 2.  Disconnect the high pressure fuel pump connector. 3.  Remove the fuel pump relay. (See RELAY LOCATION [(E)].) 4.  Start the engine and wait until the engine stalls. •  Switch the ignition off. •  Install the fuel pump relay. •  Switch the ignition ON (engine off). •  Display PID FUEL_PRES and simulation item FUEL_PUMP_REQ using the M-MDS. (See PID/DATA MONITOR INSPECTION.) (See SIMULATION INSPECTION.) •  Turn simulation item FUEL_PUMP_REQ on. •  Is the FUEL_PRES PID value 545—695 kPa {5.56—7.08 kgf/cm2, 79.1—100.0 psi}?	Yes	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 2.
		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

―  Perform a unit inspection of the high fuel pressure sensor.

―  Verify that the primary malfunction is resolved and there are no other malfunctions.

Step	Inspection	Results	Action
1	INSPECT HIGH FUEL PRESSURE SENSOR FOR MALFUNCTION •  Inspect the applicable part. (See HIGH FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-X 2.0].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FUEL DISTRIBUTOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification 1	PURPOSE: VERIFY THAT VEHICLE IS REPAIRED •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Clear the DTC recorded in the memory. (See CLEARING DTC.) •  Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ―  Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
		No	Go to the next step.
Repair completion verification 2	PURPOSE: VERIFY IF OTHER DTCs DISPLAYED •  Perform the DTC inspection. (See DTC INSPECTION.) •  Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	DTC troubleshooting completed.