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Home >> Lexus >> 2011 >> IS 350C V6-3.5L (2GR-FSE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0190

P0190





2GR-FSE ENGINE CONTROL: 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 pump discharge using this feedback to maintain the fuel's target pressure between 4 and 13 MPa (40.8 and 132.6 kgf/cm2, 580 and 1886 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.









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 / 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





WIRING DIAGRAM





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 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 / Pending.

10. Read Pending DTCs.

HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending 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 [C].





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

14. If the test result is INCOMPLETE or UNKNOWN and no pending 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.

INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 / Fuel Press.

(e) Read the values.

OK:

4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1886 psi)

Result:





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

C -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems

B -- INSPECT ECM (PR VOLTAGE)
A -- Continue to next step.

2. INSPECT FUEL PRESSURE SENSOR (VC VOLTAGE)

(a) Disconnect the fuel pressure sensor connector.





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

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

Standard Voltage:





Text in Illustration





(d) Reconnect the fuel pressure sensor connector.

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

3. INSPECT ECM (PR VOLTAGE)

(a) Start the engine.





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

Standard Voltage:





Text in Illustration





HINT
The fuel pressure in the delivery pipe is 3.5 to 4.5 MPa.

NG -- CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

OK -- REPLACE ECM Removal

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

(a) Disconnect the ECM connectors.

(b) Disconnect the fuel pressure sensor connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reconnect the ECM connectors.

(e) Reconnect the fuel pressure sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - FUEL PRESSURE SENSOR)

OK -- REPLACE FUEL PRESSURE SENSOR Removal

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

(a) Disconnect the fuel pressure sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Short):





(d) Reconnect the ECM connector.

(e) Reconnect the fuel pressure sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - FUEL PRESSURE SENSOR)

OK -- REPLACE ECM Removal
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