DTC P0191:00 [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

DTC P0191:00 [SKYACTIV-G 2.5]


DTC P0191:00	Fuel pressure sensor circuit range/performance problem
DETECTION CONDITION	The difference between the actual and target fuel pressure is equal to or more than the specification, even though the fuel pressure feedback amount is maintained low or high. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Stops high pressure fuel pump control Limits intake air amount
POSSIBLE CAUSE	Air suction in fuel line due to fuel is runout High pressure fuel pump connector or terminals malfunction Fuel pressure sensor connector or terminals malfunction PCM connector or terminals malfunction Fuel pressure sensor malfunction Insufficient fuel pressure (low pressure line) Fuel injector malfunction High pressure fuel pump malfunction Relief valve (built-into high pressure fuel pump) malfunction PCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

Related PIDs


Item (definition)	Unit/Condition	Definition	Condition/Specification (Reference)
FUEL_PRES	KPa {MPa}, mBar {Bar}, psi, in H20	Fuel pressure	Displays fuel pressure
FUEL_PRES	V	Fuel pressure	Fuel pressure is 3.0 MPa {31 kgf/cm², 435 psi}: Approx. 0.92 V Fuel pressure is 4.8 MPa {49 kgf/cm², 696 psi}: Approx. 1.17 V
LOAD	%	Engine load	Idle (after warm up): Approx. 17.64% Racing (engine speed is 2,000 rpm): Approx. 14.51% Racing (engine speed is 4,000 rpm): Approx. 21.17%
RPM	RPM	Engine speed	Displays engine speed

Diagnostic Procedure


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line 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.
2		No	Go to the next step.
3	VERIFY WHETHER MALFUNCTION IS AIR SUCTION IN FUEL LINE BY FUEL RUNOUT OR ELSEWHERE Verify the fuel gauge indicator on the instrument cluster. Does the fuel gauge indicate empty?	Yes	Refill the fuel and warm up the engine, then go to the next step.
3		No	Go to the next step.
4	INSPECT HIGH PRESSURE FUEL PUMP CONNECTOR CONDITION Switch the ignition off. Disconnect the high pressure fuel pump connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
4		No	Go to the next step.
5	INSPECT FUEL PRESSURE SENSOR CONNECTOR CONDITION Disconnect the fuel pressure sensor connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR CONDITION Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
6		No	Go to the next step.
7	INSPECT FUEL PRESSURE SENSOR Reconnect all disconnected connectors. Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the fuel distributor, then go to Step 9. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
7		No	Go to the next step.
8	INSPECT FUEL LINE PRESSURE (LOW PRESSURE LINE) Measure the low side fuel pressure. (between fuel pump and high pressure fuel pump). (See FUEL LINE PRESSURE INSPECTION [SKYACTIV-G 2.5].) Is the low side fuel pressure within specification? Specification: 405—485 kPa {4.13—4.94 kgf/cm², 58.8—70.3 psi}	Yes	Remove the fuel injector and visually inspect fuel injector or leakage. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) If there is any malfunction: Replace the fuel injector if necessary, then go to the next step. If there is no malfunction: Go to the next step.
8		No	Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED Always reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].) Start the engine and warm it up completely. Increase and keep the engine speed at 3,000 rpm for 1 min. Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5].)
10		No	DTC troubleshooting completed.

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