[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P0087 FUEL SYSTEM PRESSURE TOO LOW
Code No. P0087: Fuel System Pressure Too Low
 
 
 
 
OPERATION
  • Check code No. P0192: Fuel Pressure Sensor Circuit Low Input (Refer to ).
  • Check code No. P0628: Fuel Pump (High Pressure) Control Circuit Low Input (Refer to ).
 
 
FUNCTION
  • The engine-ECU monitors the signals input from the fuel pressure sensor.
  • Based on the input signals, the engine-ECU checks whether the fuel pressure drops the minimum pressure of the system.
 
 
TROUBLE JUDGEMENT
Check Conditions
  • More than 3 seconds have passed since the engine starting sequence was completed.
  • Battery positive voltage is more than 10 V.
  • The fuel pressure sensor output is lower than the estimated fuel pressure.
Judgement Criterion
  • The fuel pressure is lower than 2MPa for 15 seconds.
or
  • For 3 seconds, the fuel pressure sensor output subtracted from the estimated fuel pressure equals lower than 6 MPa.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • While prohibiting the operation of the injector (high pressure), carry out the control by the injector operation only.
  • Torque is restricted.
 
 
PROBABLE CAUSES
  • Harness damage in fuel pressure sensor circuit or loose connector contact
  • Harness damage in fuel pump (high pressure) circuit or loose connector contact
  • Failed fuel pressure sensor
  • Failed fuel line
  • Failed fuel tank pump and gauge assembly
  • Failed fuel pump (high pressure)
  • Failed injector (high pressure)
  • Failed high-pressure fuel line
  • Failed engine-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. Check high-pressure fuel line and fuel line
  • By a visual inspection and odour inspection, check around the high-pressure fuel line from the fuel pump (high pressure) to the injector (high pressure), and around the fuel line. Ensure that there is not fuel seepage and fuel leaks.
  • Remove the spark plug and check whether you smell the fuel from the plug hole or not. If you smell fuel, check a fuel leak from the injector (high pressure).
Is the check result normal?
Go to Step 2.
Repair.
 
STEP 2. Fuel pressure measurement.
  • Fuel pressure test (Refer to ).
Is the check result normal?
Go to Step 3.
Repair.
 
STEP 3. Check of damage in HFP5 line between fuel pressure sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Check of damage in HFPS line between fuel pressure sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Check of damage in HFPG line between fuel pressure sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
 
STEP 6. Check of damage in HFP+ line between fuel pump (high pressure) connector and engine-ECU connector.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
 
STEP 7. Check of damage in HFP- line between fuel pump (high pressure) connector and engine-ECU connector.
Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness.
 
STEP 8. Check fuel pump (high pressure) mounting position.
  • Ensure that the plunger of the fuel pump (high pressure) and tappet do not have abrasion and damage.
  • Check whether the pump cam of the exhaust camshaft is worn down or not.
Is the check result normal?
Go to Step 9.
Repair.
 
STEP 9. M.U.T-IIISE diagnosis code
  • Reconfirmation of diagnosis code.
Is the diagnosis code set?
Go to Step 10.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
 
STEP 10. Replace the fuel pump (high pressure)
  • After replacing the fuel pump (high pressure), reconfirm whether the diagnosis code is set.
Is the diagnosis code set?
Replace the engine-ECU.
Check end.