DTC P0087 Fuel Rail / System Pressure - Too Low: Wiring Diagram

Refer to DTC P0190  .

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (See FREEZE FRAME DATA  ).

1. CHECK FUEL LEAKAGE (HIGH PRESSURE SIDE) 
   1. Check around and beneath the car for gasoline leaks, fumes, etc.

      OK: No gasoline leaks present. 

   NG : REPAIR OR REPLACE FUEL SYSTEM 

   OK : GO TO NEXT STEP 

2. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0087) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the engine switch on (IG) and turn the tester on.
   3. Clear DTCs.
   4. Start the engine.
   5. Enter the following menus: DIAGNOSIS / ENHANCE OBD II / DTC INFO / CURRENT CODES.
   6. Read the DTCs using the intelligent tester.

      Result 

      RESULT REFERENCE
      
      

      Display (DTC output)	Proceed to
      P0087	A
      P0087 and other DTCs	B

      HINT:

      If any codes other than P0087 are output, perform troubleshooting for those DTCs first.

   B : GO TO  DTC CHART  

   A : GO TO NEXT STEP 

3. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST 
   1. Connect the intelligent tester to the DLC3.
   2. Start the engine and warm up the engine.
   3. Turn the tester ON.
   4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / D-4S TEST / D-4S INJ SWITCH / DIRECT. (Procedure "A")
   5. Allow the engine to idle.
   6. Monitor all of the misfire rate values that are displayed on the tester (example: CYL #1). If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")
      1. Shift the gear selector lever to the D position.
      2. Repeat procedure "A" to "B" above.
      3. Monitor all of the misfire rate values that are displayed on the tester (example: CYL #1).

         Result 

         RESULT REFERENCE
         
         

         Misfire Count	Proceed to
         No misfire counts, or misfire counts occur randomly in all cylinders	A
         Misfire counts occur in particular cylinder	B

   YES : DTC CAUSED BY RUNNING OUT OF FUEL 

   NO : GO TO NEXT STEP 

4. CHECK MISFIRE COUNT (CYL #10, #20, #30, #40, #50 AND #60) 

   B : REPLACE FUEL INJECTOR FOR DIRECT INJECTION 

   A : GO TO NEXT STEP 

5. CHECK FUEL PRESSURE SENSOR 
   1. Connect the intelligent tester to the DLC3.
   2. Start the engine.
   3. Turn the tester on.
   4. Enter the following menus: DIAGNOSIS / ENHANCE OBD II / ACTIVE TEST / TARGET FUEL PRESS / USER DATA / FUEL PRESS.
   5. Check that the fuel pressure fluctuates when the target fuel pressure changes.

      HINT:

      The TARGET FUEL PRESS operation lowers the target fuel pressure by 12.5% or increase the target fuel pressure by 25%.

      Result 

      RESULT REFERENCE
      
      

      Inspection Result	Proceed to
      Fuel pressure does not fluctuate	A
      Fuel pressure fluctuates in accordance with tester operation	B
      Fuel pressure pulsates	C

   A : REPLACE FUEL PRESSURE SENSOR 

   B : Go to step   8 

   C : GO TO NEXT STEP. 

6. CHECK FUEL PUMP (FUEL PUMP OPERATION) 
   1. Check the fuel pump operation (See ON-VEHICLE INSPECTION ).

   NG : REPLACE FUEL PUMP 

   OK : GO TO NEXT STEP 

7. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) 
   1. Check the fuel pressure (low pressure side) (See ON-VEHICLE INSPECTION ).

      OK: Idle: 196 to 588 kPa (2 to 6 kgf/km ²  , 28 to 85 psi) 5 minutes after engine has stopped: 147 kPa (1.5 kgf/km ²  , 21 psi) or more 

   NG : REPLACE FUEL PRESSURE REGULATOR 

   OK : GO TO NEXT STEP 

8. CHECK FUEL LEAKAGE (HIGH PRESSURE FUEL LINE) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the engine switch on (IG) and turn the intelligent tester on.
   3. Enter the following menus: DIAGNOSIS / ENHANCE OBD II / DATA LIST / ALL / FUEL PRESS.
   4. Start the engine.
   5. Check that the fuel pressure fluctuations when the engine switch is turned off.

      HINT:

      Turn the engine switch off and on (IG) before checking the fuel pressure.

      Fig 1: Fuel Pressure Fluctuations Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE
      
      

      Inspection Result	Proceed to
      Fuel pressure is almost constant, or fluctuations are gradual	A
      Fuel pressure drops suddenly	B

   A : Go to step   10 

   B : GO TO NEXT STEP 

9. CHECK RELIEF VALVE 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the engine switch on (IG) and turn the intelligent tester on.
   3. Enter the following menus: DIAGNOSIS / ENHANCE OBD II / DATA LIST / ALL / FUEL PRESS.
   4. Start the engine.
   5. Check the fuel pressure fluctuations when the fuel hose is pressed with your fingers.

      Result 

      RESULT REFERENCE
      
      

      Inspection Result	Proceed to
      Pressing the hose raises the fuel pressure slightly	A
      Fuel pressure does not fluctuate	B

   A : REPLACE RELIEF VALVE 

   B : GO TO NEXT STEP 

10. REPLACE FUEL PUMP (FOR HIGH PRESSURE) 

    NEXT 

11. CHECK IF DTC OUTPUT REOCCURS (SEE IF DTC P0087 IS OUTPUT AGAIN) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG) and turn the tester on.
    3. Clear DTCs.
    4. Start the engine.
    5. Enter the following menus: DIAGNOSIS / ENHANCE OBD II / DTC INFO / CURRENT CODES.
    6. Read the DTCs using the intelligent tester.

       Result 

       RESULT REFERENCE
       
       

       Display (DTC output)	Proceed to
       P0087	A
       No output	B

    B : END 

    A : REPLACE ECM