Dtc P0191 Fuel Rail Pressure Sensor Circuit Range / Performance


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

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.

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System. 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).
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor (common rail)
  3. ECM

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

WIRING DIAGRAM

Refer to DTC P0087 (LandCruiser RM0000018800C4X_06.html).

INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
1.READ VALUE USING INTELLIGENT TESTER (FUEL PRESS AND TARGET COMMON RAIL PRESSURE)

  1. Connect the intelligent tester to the DLC3.

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

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

  1. Start the engine.

  1. 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".


B
Go to step 4
A


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

  1. Disconnect the fuel pressure sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C82-5 (PR) - C90-16 (PCR1)
    		Always
    		Below 1 Ω
    C82-2 (PR2) - C90-2 (PCR2)
    		Always
    		Below 1 Ω
    C82-1 (VCS) - C90-13 (VCS)
    		Always
    		Below 1 Ω
    C82-6 (VC) - C90-14 (VCM)
    		Always
    		Below 1 Ω
    C82-4 (E2) - C90-15 (E2M)
    		Always
    		Below 1 Ω
    C82-3 (E2S) - C90-8 (E2S)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C82-5 (PR) or C90-16 (PCR1) - Body ground
    		Always
    		10 kΩ or higher
    C82-2 (PR2) or C90-2 (PCR2) - Body ground
    		Always
    		10 kΩ or higher
    C82-1 (VCS) or C90-13 (VCS) - Body ground
    		Always
    		10 kΩ or higher
    C82-6 (VC) or C90-14 (VCM) - Body ground
    		Always
    		10 kΩ or higher
    C82-4 (E2) or C90-15 (E2M) - Body ground
    		Always
    		10 kΩ or higher
    C82-3 (E2S) or C90-8 (E2S) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the fuel pressure sensor connector.

  1. Reconnect the ECM connector.



OK
Go to step 5

NG
Go to step 3

3.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


4.CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)

  1. Connect the intelligent tester to the DLC3.

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

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Let the engine idle for 1 second.

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

  1. Read the DTCs.

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


B
END
A


5.REPLACE COMMON RAIL

  1. Replace the common rail (LandCruiser RM0000044W3015X.html).


NEXT


6.BLEED AIR FROM FUEL SYSTEM

  1. Bleed the air from the fuel system (LandCruiser RM000002SY803CX_01_0002.html).


NEXT


7.CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)

  1. Connect the intelligent tester to the DLC3.

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

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Let the engine idle for 1 second.

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

  1. Read the DTCs.

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


B
END
A


8.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002CX.html).


NEXT


9.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

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

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Let the engine idle for 1 second.

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

  1. Confirm that the DTC is not output again.


NEXT

END