P0190

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0190, P0192, P0193: Fuel Rail Pressure Sensor Circuit
P0193 - Fuel Rail Pressure Sensor Circuit High Input

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 between 4 and 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1885 psi). If the sensor output stops, the ECM will stop the fuel pump for high pressure and supply fuel using the low pressure side fuel pump.









HINT
After confirming DTC P0190, use the Techstream to confirm the fuel pressure in the delivery pipe by entering the following menus: Powertrain / Engine / Data List / All Data / Fuel Press.





MONITOR DESCRIPTION

These DTCs are set if the fuel pressure sensor output voltage is out of the standard range. The DTCs stand for an open or short malfunction of the sensor circuit.

If these DTCs are set, the ECM enters fail-safe mode and limits the engine power. Fail-safe mode continues until the engine switch is turned off.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

P0190:





P0192:





P0193:





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

4. Turn the engine switch off and wait for at least 30 seconds.

5. Turn the engine switch on (IG) and turn the Techstream on.

6. Wait 3 seconds or more [A].

7. Start the engine.

8. Idle the engine for 10 seconds [B].

9. Enter the following menus: Powertrain / Engine / Trouble Codes.

10. Read the DTCs [C].

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.

11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

12. Input the DTC: P0190, P0192 or P0193.

13. Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.

14. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. READ VALUE USING TECHSTREAM (FUEL PRESSURE)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / All Data / Fuel Press.

(e) Read the values.

Pressure:

4000 to 13000 kPa (40.8 to 132.6 kgf/cm2, 580 to 1885 psi).

Result:





HINT
*: The value must change when the engine is running or stopped.

B -- INSPECT FUEL PRESSURE SENSOR

C -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
A -- Continue to next step.

2. INSPECT ECM (VC VOLTAGE)

(a) Disconnect the H17 fuel pressure sensor connector.





(b) Turn the engine switch on (IG).

(c) Measure the voltage between the terminals of the fuel pressure sensor connector.

Standard voltage:





NG -- CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)
OK -- Continue to next step.

3. INSPECT FUEL PRESSURE SENSOR

(a) Inspect the fuel pressure sensor Testing and Inspection.

NG -- REPLACE FUEL PRESSURE SENSOR Removal
OK -- Continue to next step.

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

(a) Disconnect the H17 fuel pressure sensor connector.





(b) Disconnect the E1 and E3 ECM connectors.

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

Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal