The high-pressure direct injection fuel system consists of a spill control valve, check valve, fuel relief valve, fuel pressure sensor, fuel pump assembly (for high pressure side) and fuel injector assemblies. The spill control valve adjusts the return volume of high-pressure fuel. The check valve mechanically opens and closes the path to the fuel delivery pipe. The relief valve releases the fuel back to the fuel tank if there is a malfunction in the high-pressure fuel system. The fuel pump assembly (for high pressure side) is installed to the cylinder head cover and operated by a cam installed to the end of the exhaust camshaft. Rotation of the camshaft moves the pump plunger inside the fuel pump assembly (for high pressure side) up and down, pressurizing the fuel. The pressurized fuel opens the check valve and is pumped into the fuel delivery pipe. The ECM controls the spill control valve to adjust the fuel pressure between 2.4 and 30 MPa (24.5 and 306 kgf/cm2) and monitors signals from the fuel pressure sensor to maintain the target fuel pressure.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P008700 | Fuel Rail / System Pressure - Too Low | Although the ECM is not requesting the fuel pump assembly (for high pressure side) to open the spill control valve, fuel pressure decreases 5 MPa (51.0 kgf/cm2, 725 psi) from target pressure for about 10 seconds (1 trip detection logic). | ·
Leak of fuel ·
Fuel pipe (fuel tank - fuel pump assembly (for high pressure side)) ·
Fuel pipe (fuel pump assembly [for high pressure side] - fuel injector assembly) ·
Fuel injector assembly ·
Fuel pump (for low pressure side) ·
Fuel delivery pipe ·
Fuel system ·
ECM |
Comes on | DTC stored | SAE Code:
P0087 |
If the fuel pressure decreases despite an increase request signal being sent to the fuel pump assembly (for high pressure side) by the ECM, the ECM will illuminate the MIL and store this DTC.
| Required Sensors/Components | Fuel pressure sensor |
| Frequency of Operation | Continuous |
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Permanent misfire and fuel system DTCs can only be cleared when performing the universal trip driving pattern when no malfunction is detected.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Record the Freeze Frame Data.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Start the engine.
Turn the GTS on.
Based on the engine speed, engine load and other conditions displayed in the Freeze Frame Data, reproduce the conditions present when the DTC was stored.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P008700.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
Read Freeze Frame Data using the GTS. 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.
Check around and beneath the car for fuel leaks, fumes, etc.
No fuel leaks present.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
| Result | Proceed to |
|---|---|
| DTC P008700 is output | A |
| DTC P008700 and other DTCs are output | B |
If any DTCs other than P008700 are output, troubleshoot those DTCs first.
A
B
Has the vehicle run out of fuel in the past?
| Proceed to |
|---|
| YES |
| NO |
YES
NO
Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Misfire Count Cylinder #1 to Misfire Count Cylinder #4.
| Tester Display |
|---|
| Misfire Count Cylinder #1 |
| Misfire Count Cylinder #2 |
| Misfire Count Cylinder #3 |
| Misfire Count Cylinder #4 |
Monitor all of the misfire count that are displayed on the GTS.
| Misfire Count | Proceed to |
|---|---|
| There are no misfire counts | A |
| 3 cylinders or more have misfire counts | |
| 1 or 2 cylinders have misfire counts | B |
Perform "Inspection After Repair" after replacing the fuel injector assembly.
A
B
Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / High Fuel Pressure Sensor.
| Tester Display |
|---|
| High Fuel Pressure Sensor |
Check that the fuel pressure fluctuates when the engine condition changes from idling to racing.
| Result | Proceed to |
|---|---|
| Fuel pressure does not rise | A |
| Fuel pressure fluctuates | B |
| Fuel pressure does not fluctuate | C |
Perform "Inspection After Repair" after replacing the fuel delivery pipe.
A
B
C
Check the fuel pump operation (for low pressure side).
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Check the fuel pressure (for low pressure side).
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Replace the fuel pump assembly (for high pressure side).
Perform "Inspection After Repair" after replacing the fuel pump assembly (for high pressure side).
| Proceed to |
|---|
| NEXT |
NEXT
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs.
Turn the ignition switch off and wait for at least 30 seconds.
| Proceed to |
|---|
| NEXT |
NEXT
Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTC P008700 is output | B |
A
B