DTC P0191:00 [MZR 2.3 DISI Turbo]

DTC P0191:00	Fuel pressure sensor circuit range/performance problem
DETECTION CONDITION	• If the fluctuation range of the actual fuel pressure is below the set value when the fluctuation range of the target fuel pressure has exceeded the set value, the PCM determines that the fuel pressure sensor performance problem. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA (Mode 2)/Snapshot data is available. • The DTC is stored in the PCM memory.
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 (leakage fuel) • Fuel pressure limiter malfunction • PCM malfunction

DTC P0191:00

Fuel pressure sensor circuit range/performance problem

DETECTION CONDITION

• If the fluctuation range of the actual fuel pressure is below the set value when the fluctuation range of the target fuel pressure has exceeded the set value, the PCM determines that the fuel pressure sensor performance problem.

Diagnostic support note

• This is a continuous monitor (CCM).

• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.

• PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.

• FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

• The DTC is stored in the PCM memory.

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 (leakage fuel)

• Fuel pressure limiter malfunction

• PCM malfunction

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.
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.
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.
No	Go to the next step.
4	INSPECT HIGH PRESSURE FUEL PUMP CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the high pressure fuel pump connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
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, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
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, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
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 [MZR 2.3 DISI Turbo].) • Is there any malfunction?	Yes	Replace the fuel pressure sensor, then go to Step 9. (See FUEL PRESSURE SENSOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
No	Go to the next step.
8	INSPECT FUEL LINE PRESSURE (LOW PRESSURE LINE) • Measure the fuel line pressure (low-pressure). (See FUEL LINE PRESSURE INSPECTION [MZR 2.3 DISI Turbo].) • Is the fuel pressure within the specification?	Yes	Remove the fuel injector and visually inspect fuel injector or leakage. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) Replace the fuel injector if necessary, then go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 2.3 DISI Turbo].) • Start the engine and run the engine under the FREEZE FRAME DATA (Mode 2) condition. • Perform the KOER self test. (See KOEO/KOER SELF TEST [MZR 2.3 DISI Turbo].) • Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) Go to the next step.
No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 2.3 DISI Turbo].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.3 DISI Turbo].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

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.

Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.

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.

Go to the next step.

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.

Go to the next step.

INSPECT HIGH PRESSURE FUEL PUMP CONNECTOR CONDITION

• Switch the ignition to off.

• Disconnect the high pressure fuel pump connector.

• Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 9.

Go to the next step.

INSPECT FUEL PRESSURE SENSOR CONNECTOR CONDITION

• Disconnect the fuel pressure sensor connector.

• Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 9.

Go to the next step.

INSPECT PCM CONNECTOR CONDITION

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 9.

Go to the next step.

INSPECT FUEL PRESSURE SENSOR

• Reconnect all disconnected connectors.

• Inspect the fuel pressure sensor.

(See FUEL PRESSURE SENSOR INSPECTION [MZR 2.3 DISI Turbo].)

• Is there any malfunction?

Yes

Replace the fuel pressure sensor, then go to Step 9.

(See FUEL PRESSURE SENSOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Go to the next step.

INSPECT FUEL LINE PRESSURE (LOW PRESSURE LINE)

• Measure the fuel line pressure (low-pressure).

(See FUEL LINE PRESSURE INSPECTION [MZR 2.3 DISI Turbo].)

• Is the fuel pressure within the specification?

Yes

Remove the fuel injector and visually inspect fuel injector or leakage.

(See FUEL INJECTOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Replace the fuel injector if necessary, then go to the next step.

Repair or replace the malfunctioning part according to the inspection results, then go to the next step.

VERIFY DTC TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

(See AFTER REPAIR PROCEDURE [MZR 2.3 DISI Turbo].)

• Start the engine and run the engine under the FREEZE FRAME DATA (Mode 2) condition.

• Perform the KOER self test.

(See KOEO/KOER SELF TEST [MZR 2.3 DISI Turbo].)

• Is the PENDING CODE for this DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

(See PCM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(See AFTER REPAIR PROCEDURE [MZR 2.3 DISI Turbo].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 2.3 DISI Turbo].)

DTC troubleshooting completed.