1Kd-Ftv Engine Control. Dtc P0191 Fuel Rail Pressure Sensor Circuit Range / Performance

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

1Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (FUEL PRESS AND TARGET COMMON RAIL PRESSURE)

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)

REPLACE COMMON RAIL ASSEMBLY

BLEED AIR FROM FUEL SYSTEM

CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0191 Fuel Rail Pressure Sensor Circuit Range / Performance

DESCRIPTION

The ECM monitors the internal fuel pressure of the common rail using the fuel pressure sensor, and controls the suction control valve to regulate the common rail pressure so that it reaches the target pressure determined by the ECM. The pressure sensor is a semiconductor that varies its electrical resistance when pressure is applied to its silicon chip. This sensor outputs a voltage in proportion to the common rail fuel pressure.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).
Dtc
P0191 Fuel Rail Pressure Sensor Circuit Range / Performance

P0191
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Idling for 1 second	The difference between the main and sub voltage outputs of the fuel pressure sensor is 0.04 V or less, or 1.06 V or higher for 1 second or more (1 trip detection logic).	Open or short in fuel pressure sensor circuit Fuel pressure sensor (common rail) ECM

Related Data List
DTC No.	Data List
P0191	Fuel Press Target Common Rail Pressure

WIRING DIAGRAM

Refer to DTC P0087 (HILUX_TGN26 RM00000188005ZX_06.html).

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK058X.html) and initialization (HILUX_TGN26 RM000000TIN056X.html).
After replacing the fuel supply pump assembly, the ECM needs initialization (HILUX_TGN26 RM000000TIN056X.html).
After replacing an injector assembly, the ECM needs registration (HILUX_TGN26 RM0000012XK058X.html).

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

1.READ VALUE USING INTELLIGENT TESTER (FUEL PRESS AND TARGET COMMON RAIL PRESSURE)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Press and Target Common Rail Pressure.

Start the engine.

Check the change in the values for the data list items above when increasing the engine speed from idling to 3000 rpm with no load.

Result
Result
Proceed to
Fuel Press is always 10000 kPa or less
or
Fuel Press is always 200000 kPa or higher
A
Except above
B
HINT:
Normally, "Fuel Press" is within 15000 kPa of "Target Common Rail Pressure".

Result
Result	Proceed to
Fuel Press is always 10000 kPa or less or Fuel Press is always 200000 kPa or higher	A
Except above	B

Go to step 4

A

2.CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

Disconnect the fuel pressure sensor connector.

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C16-5 (PR) - C113-16 (PCR1)	Always	Below 1 Ω
C16-2 (PR2) - C113-2 (PCR2)	Always	Below 1 Ω
C16-1 (VCS) - C113-13 (VCS)	Always	Below 1 Ω
C16-6 (VC) - C114-13 (VC)	Always	Below 1 Ω
C16-4 (E2) - C114-14 (E2)	Always	Below 1 Ω
C16-3 (E2S) - C113-8 (E2S)	Always	Below 1 Ω
C16-5 (PR) or C113-16 (PCR1) - Body ground	Always	10 kΩ or higher
C16-2 (PR2) or C113-2 (PCR2) - Body ground	Always	10 kΩ or higher
C16-1 (VCS) or C113-13 (VCS) - Body ground	Always	10 kΩ or higher
C16-6 (VC) or C114-13 (VC) - Body ground	Always	10 kΩ or higher

Reconnect the fuel pressure sensor connector.

Reconnect the ECM connector.

Go to step 5

Go to step 3

3.REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

NEXT

4.CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Clear the DTCs (HILUX_TGN26 RM000000PDK0X2X.html).

Let the engine idle for 1 second.

Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.
Result
Result
Proceed to
P0191 is output
A
No DTC is output
B

Result
Result	Proceed to
P0191 is output	A
No DTC is output	B

END

A

5.REPLACE COMMON RAIL ASSEMBLY

Replace the common rail assembly (HILUX_TGN26 RM0000044W300FX.html).

NEXT

6.BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system (HILUX_TGN26 RM000002SY802GX_01_0002.html).

NEXT

7.CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Clear the DTCs (HILUX_TGN26 RM000000PDK0X2X.html).

Let the engine idle for 1 second.

Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.
Result
Result
Proceed to
P0191 is output
A
No DTC is output
B

Result
Result	Proceed to
P0191 is output	A
No DTC is output	B

END

A

8.REPLACE ECM

Replace the ECM (HILUX_TGN26 RM0000013Z001IX.html).

NEXT

9.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Clear the DTCs (HILUX_TGN26 RM000000PDK0X2X.html).

Let the engine idle for 1 second.

Enter the following menus: Powertrain / Engine and ECT / DTC.

Confirm that the DTC is not output again.

END