DTC    P0192    Fuel Rail Pressure Sensor Circuit Low Input

DTC    P0193    Fuel Rail Pressure Sensor Circuit High Input

for Preparation Click here


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 internal pressure to the target pressure. The pressure sensor is a semiconductor that varies electrical resistance when pressure is applied to its silicon chip.
This sensor outputs the voltage in proportion to the internal fuel pressure.

P0192 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 5 seconds
Fuel pressure sensor output voltage 0.065 V or less for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM

P0193 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 5 seconds
Fuel pressure sensor output voltage 4.8 V or more for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM

Related Data List 
DTC No.
Data List
P0192
  1. Target Common Rail Pressure
  2. Fuel Press
P0193

HINT:
  1. If DTC P0192 or P0193 is stored, the following symptoms may appear:
    1. Lack of power
  2. When DTC P0192 or P0193 is stored, check the internal fuel pressure of the common rail by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Fuel Press and Target Common Rail Pressure.
  3. Under a stable operating condition such as idling, Fuel Press is within +/-10 MPa of Target Common Rail Pressure.


WIRING DIAGRAM


A198999E04


INSPECTION PROCEDURE

NOTICE:
When replacing the ECM, fuel injector and/or DPF catalyst, the ECM needs Registration and Initialization (Click here).

HINT:
  1. When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.
  2. 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)

  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 / Target Common Rail Pressure and Fuel Press.

  1. Check that the internal fuel pressure of the common rail is within the specification below.

    Standard:
    Fuel Press is within +/-10 MPa of Target Common Rail Pressure when engine is idling and running at 3000 rpm without load.



NG
Go to step 3
OK


2.CHECK WHETHER DTC OUTPUT RECURS (DTC P0192, P0193)

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch to ON and wait for 5 seconds or more.

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

  1. Read the DTCs.
    Result 
    Result
    		Proceed to
    No DTC output
    		A
    DTC P0192 or P0193
    		B



B
Go to step 8
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)  

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

  1. Disconnect the fuel pressure sensor connector.



    A200301E01

  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
    B44-2 (PCR1) - B9-16 (PC)
    		Always
    		Below 1 Ω
    B44-3 (VC1) - B9-15 (VCS)
    		Always
    		Below 1 Ω
    B44-1 (E1) - B9-14 (E2S)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B44-2 (PCR1) or B9-16 (PC) - Body ground
    		Always
    		10 kΩ or higher
    B44-3 (VC1) or B9-15 (VCS) - Body ground
    		Always
    		10 kΩ or higher
    B44-1 (E1) or B9-14 (E2S) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Fuel Pressure Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the fuel pressure sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 9
OK


4.CHECK ECM TERMINAL VOLTAGE (FUEL PRESSURE SENSOR VOLTAGE)


    A200302E01

  1. Disconnect the fuel pressure sensor connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    B44-3 (VC1) - B44-1 (E1)
    		Ignition switch ON
    		4.5 to 5.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Fuel Pressure Sensor)

  1. Reconnect the fuel pressure sensor connector.



NG
Go to step 8
OK


5.REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)

  1. Replace the common rail assembly (Click here).


NEXT


6.BLEED AIR FROM FUEL SYSTEM

  1. Bleed air from fuel system (Click here).


NEXT


7.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch to ON and wait for 5 seconds or more.

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

  1. Read the DTCs.
    Result 
    Result
    		Proceed to
    DTC P0192 or P0193
    		A
    No DTC output
    		B



B
END
A


8.REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 10

9.REPAIR OR REPLACE HARNESS OR CONNECTOR

NEXT


10.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off and wait for 30 seconds.

  1. Turn the ignition switch to ON and wait for 5 seconds or more.

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

  1. Confirm that the DTC is not output again.

    HINT:
    Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.

    1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    2. Input DTC P0192 and/or P0193.

    3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, increase idling time.


NEXT

END