Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM
READ VALUE OF INTELLIGENT TESTER (FUEL PRESSURE)
INSPECT FUEL PRESSURE SENSOR (VC VOLTAGE)
CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)
CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)
DTC P0190 Fuel Rail Pressure Sensor Circuit
DTC P0192 Fuel Rail Pressure Sensor Circuit Low Input
DTC 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 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.READ VALUE OF INTELLIGENT TESTER (FUEL PRESSURE) |
Connect the intelligent tester to the DLC3.
Start the engine.
Turn the intelligent tester ON.
Enter the following menus: Power train / Engine / Data List / Fuel Press.
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.
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| OK | |
| 3.INSPECT ECM (PR VOLTAGE) |
Start the engine.
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).
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| OK | ||
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| 4.CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR) |
Disconnect the E3 and E6 ECM connectors.
Disconnect the E37 fuel pressure sensor connector.
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
Reconnect the ECM connector.
Reconnect the fuel pressure sensor connector.
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| OK | ||
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| 5.CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR) |
Disconnect the E37 fuel pressure sensor connector.
Disconnect the E6 ECM connector.
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
Reconnect the ECM connector.
Reconnect the fuel pressure sensor connector.
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| OK | ||
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