P0190

DESCRIPTION

The fuel pressure sensor is installed on the delivery pipe. The sensor changes fuel pressure to an electrical signal and sends the signal to the ECM. Then the ECM controls the feedback of the pump discharge to maintain the fuel's target pressure at 4 to 13 MPa (40.8 to 132.6 kgf/cm, 2, 580 to 1,885 psi). If the sensor output stops, the ECM will stop the high pressure side fuel pump and supply fuel using the low pressure side fuel pump.

The fuel pressure sensor is installed on a fuel delivery pipe and detects the fuel pressure. It controls of feedback the pump discharge in order to keep the fuel at target pressure 4 to 13 MPa (40.8 to 132.6 kgf/cm², 580 to 1,885 psi) by the ECM.

DTC No.	DTC Detection Condition	Trouble Area
P0190	Open or short in fuel pressure sensor circuit for 5 seconds or more (1 trip detection logic)	Open or short in fuel pressure sensor Fuel pressure sensor ECM
P0192	Short in fuel pressure sensor circuit for 5 seconds or more (1 trip detection logic)	Short in fuel pressure sensor Fuel pressure sensor ECM
P0193	Open in fuel pressure sensor circuit for 5 seconds or more (1 trip detection logic)	Open in fuel pressure sensor Fuel pressure sensor ECM

HINT:

After confirming DTC P0190, use intelligent tester to confirm the fuel pressure in the delivery pipe in Power train / Engine / Data List / Fuel Press.

Fuel Pressure (MPa)	Malfunction
Approximately 0	PR circuit short
19.6 or more	VC circuit open or short PR circuit open E2 circuit open

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
   
2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred (Click here).
   

1. READ VALUE OF INTELLIGENT TESTER (FUEL PRESSURE)

1. Connect the intelligent tester to the DLC3.

2. Start the engine.

3. Turn the intelligent tester ON.

4. Enter the following menus: Power train / Engine / Data List / Fuel Press.

5. Read the values.

   Pressure:

   4 to 13 MPa (40.8 to 132.6 kgf/cm², 580 to 1,885 psi).
   

   
   

   Result:

   Fuel Pressure (MPa)	Proceed to
   19.6 or more	A
   0.0	B
   OK (4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1,885 psi)) *	C

   HINT:

   *: The value must be changed when the engine is run or stopped.

B	Go to step 3
C	CHECK FOR INTERMITTENT PROBLEMS

A

2. INSPECT FUEL PRESSURE SENSOR (VC VOLTAGE)

1. Disconnect the E37 fuel pressure sensor connector.

2. Turn the engine switch on (IG).

3. Measure the voltage of the E37 fuel pressure sensor connector.

   Standard voltage:

   Tester Connection	Specified Condition
   VC (E37-3) - E2 (E37-1)	4.5 to 5.5 V

NG	Go to step 4

OK

3. INSPECT ECM (PR VOLTAGE)

1. Start the engine.

2. Measure the voltage of the E6 and E3 ECM connectors.

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   PR (E6-25) - E2 (E3-28)	25°C (77°F)	1.8 to 2.3 V

HINT:

The fuel pressure in the delivery pipe is 4 to 13 MPa (40.8 to 132.6 kgf/cm², 580 to 1,885 psi).

NG	Go to step 5

OK
REPLACE ECM

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

1. Disconnect the E3 and E6 ECM connectors.

2. Disconnect the E37 fuel pressure sensor connector.

3. Measure the resistance of the wire harness side connectors.

   Standard resistance (Check for open):

   Tester Connection	Specified Condition
   VC (E3-29) - VC (E37-3)	Below 1 Ω
   PR (E6-25) - PR (E37-2)	Below 1 Ω
   E2 (E3-28) - E2 (E37-1)	Below 1 Ω

   Standard resistance (Check for short):

   Tester Connection	Specified Condition
   VC (E3-29) or VC (E37-3) - Body ground	10 kΩ or higher
   PR (E6-25) or PR (E37-2) - Body ground	10 kΩ or higher

4. Reconnect the ECM connector.

5. Reconnect the fuel pressure sensor connector.

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE ECM

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

1. Disconnect the E37 fuel pressure sensor connector.

2. Disconnect the E6 ECM connector.

3. Measure the resistance of the wire harness side connectors.

   Standard resistance (Check for short):

   Tester Connection	Specified Condition
   PR (E6-25) or PR (E37-2) - Body ground	10 kΩ or higher

4. Reconnect the ECM connector.

5. Reconnect the fuel pressure sensor connector.

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE FUEL PRESSURE SENSOR