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Home >> Lexus >> 2012 >> LS 460 AWD V8-4.6L (1UR-FSE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0087

P0087





1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0087: Fuel Rail / System Pressure - Too Low
P0087 - Fuel Rail / System Pressure - Too Low

DESCRIPTION

The cylinder fuel injection method high-pressure fuel system consists of the spill control valve, pump plunger and check valve. The spill control valve adjusts the discharge amount of the high-pressure fuel, the pump plunger operated by the camshaft pressurizes fuel, the check valve mechanically opens and closes the line to the fuel delivery pipe. The fuel pump for high pressure is installed to the cylinder head cover (bank 1 and bank 2) and is driven by the cam located at the rear end of the intake camshaft. When the plunger moves up and down by the camshaft rotations, it pressurizes the fuel. The pressurized fuel then pushes open the check valve, and the fuel flows to the fuel delivery pipe. The ECM controls the spill control valve to adjust the fuel pressure to 4 to 13 MPa (41 to 133 kgf/cm2). The ECM receives signals from the fuel pressure sensor, monitors the fuel pressure, and maintains the target fuel pressure. If the fuel pressure of the fuel delivery pipe exceeds 15.3 MPa (156 kgf/cm2), the fuel relief valve opens and returns the fuel to the fuel tank.









MONITOR DESCRIPTION

If the fuel pressure decreases even after the ECM commands the high-pressure fuel pump to close the spill control valve, a DTC is output.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.

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

3. Record the Freeze Frame Data.

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

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

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

7. Based on engine rpm, engine load and other freeze frame data stored in the ECM, reproduce the conditions present when the DTC was stored.

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

9. Read the DTCs.

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

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

11. Input the DTC: P0087.

12. Check the DTC judgment result.





HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

13. 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.

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. CHECK FUEL LEAK

(a) Check around and beneath the car for gasoline leaks, fumes, etc.

OK:

No gasoline leaks present.

NG -- REPAIR OR REPLACE FUEL LEAK POINT
OK -- Continue to next step.

2. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0087)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the tester ON.

(c) Enter the following menus: Powertrain / Engine / Trouble Codes.

(d) Read the DTCs.

Result:





B -- GO TO DTC CHART SFI System
A -- Continue to next step.

3. CHECK FUEL PRESSURE (LOW PRESSURE)

(a) Check the fuel pressure Fuel System.

NG -- REPLACE FUEL PUMP ASSEMBLY (FOR LOW PRESSURE) Removal
OK -- Continue to next step.

4. CHECK MISFIRE COUNT

(a) Connect the Techstream to the DLC3.

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

(c) Start the engine.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.

(e) Allow the engine to idle.

(f) Monitor all of the misfire rate values that are displayed on the tester: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire rate to Cylinder #8 Misfire rate.

If no misfire counts occur for any of the cylinders, perform the following procedure:

(1) Move the shift lever to the D position.

(2) Monitor all of the misfire rate values that are displayed on the tester.

Result:





B -- REPLACE FUEL INJECTOR (FOR DIRECT INJECTION) Removal
A -- Continue to next step.

5. INSPECT FUEL RELIEF VALVE

(a) Connect the Techstream to the DLC3.

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

(c) Start the engine.

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

(e) Write down the Fuel Press value.

(f) Turn the engine switch off.

(g) Wait for 10 seconds.

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

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

(j) Compare the FUEL PRESS (Fuel Press) value from and the fuel pressure value after the engine switch was turned on (IG).

Result:





B -- REPLACE FUEL RELIEF VALVE Removal
A -- Continue to next step.

6. CHECK FUEL PRESSURE (HIGH PRESSURE)

(a) Check the fuel pressure Fuel System.

NG -- REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE OF BANK 1 AND BANK 2) Removal
OK -- Continue to next step.

7. INSPECT INJECTOR DRIVER (NO. 1 AND NO. 2)

(a) Connect the Techstream to the DLC3.

(b) Replace the No. 1 and No. 2 injector drivers with new or normally functioning ones.





NOTICE:
Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.

(c) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(d) Perform the driving test.

(e) Enter the following menus: Powertrain / Engine / Trouble Codes.

(f) Read the DTCs.

Result





B -- REPLACE INJECTOR DRIVER Removal
A -- Continue to next step.

8. REPLACE FUEL PUMP (FOR HIGH PRESSURE OF BANK 1 AND BANK 2)

(a) Replace the fuel pump (for high pressure of bank 1 and bank 2) Removal.

NEXT -- Continue to next step.

9. CHECK IF DTC OUTPUT REOCCURS

(a) Connect the Techstream to the DLC3.

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

(c) Start the engine.

(d) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(e) Enter the following menus: Powertrain / Engine / Trouble Codes.

(f) Read DTCs.

Result:





B -- END

A -- REPLACE ECM Removal
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