DTC P0191:00 [SKYACTIV-G 2.0]

id0102h1147600

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.

•  The DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  Stops the high pressure fuel pump control.

•  Limits the 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

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. • The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Stops the high pressure fuel pump control. • Limits the 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

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 SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service 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 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 2.0].) • Is the fuel pressure normal? (Record fuel pressure to utilize for diagnosis in Step 7)	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location, then go to Step 10.
8	INSPECT FUEL PRESSURE SENSOR • Switch the ignition OFF (LOCK). • Disconnect the high pressure fuel pump connector. Note • The PCM may store a DTC by starting the engine with the high pressure fuel pump connector disconnected. • Start the engine and idle it. • Display PID FUEL_PRES using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) •	Yes	• Switch the ignition OFF (LOCK). • Connect the high pressure fuel pump connector. • Clear the DTC which occurred by performing the diagnostic procedure in Step 7. (See OBD READ/CLEAR DIAGNOSTIC TEST RESULTS [SKYACTIV-G 2.0].) • Go to the next step (fuel pressure sensor is normal).
8		No	Replace the fuel distributor, then go to Step 10. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
9	INSPECT HIGH PRESSURE FUEL PUMP • Inspect high pressure fuel pump. (See HIGH PRESSURE FUEL PUMP INSPECTION [SKYACTIV-G 2.0].) • Is the high pressure fuel pump normal?	Yes	Go to the next step.
9		No	Replace the high pressure fuel pump, then go to Step 10. (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 2.0] .)
10	INSPECT FUEL INJECTOR • Inspect fuel injector. (See FUEL INJECTOR INSPECTION [SKYACTIV-G 2.0].) • Is the fuel injector normal?	Yes	Remove the fuel injector to visually inspect for leakage. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].) • If there is leakage: ― Replace the fuel injector which has leakage, then go to the next step. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].) • If there is no leakage: ― Go to the next step.
10		No	Replace the fuel injector, then go to the next step. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
11	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 2.0].) • 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 2.0].) • 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 2.0].) Go to the next step.
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.0].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0].)
12		No	DTC troubleshooting completed.