The high-pressure direct injection fuel system consists of a spill control valve, check valve, fuel relief valve, fuel pressure sensor (for high pressure side), fuel pump assembly (for high pressure side) and direct 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 20 MPa (25 and 204 kgf/cm2, 348 and 2900 psi) and monitors signals from the fuel pressure sensor (for high pressure side) to maintain the target fuel pressure.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P008700 | Fuel Rail / System Pressure - Too Low | Either of the following conditions is met (1 trip detection logic):
·
The actual fuel pressure is lower than the target fuel pressure value by 5 MPa (51.0 kgf/cm2, 725 psi) or more for 10 seconds or more during in-cylinder injection. ·
The actual fuel pressure value is lower than the target fuel pressure value by 2 MPa (20.4 kgf/cm2, 290 psi) or more for 15 seconds or more during port injection only. |
·
Leak of fuel ·
Fuel pipe (fuel tank - fuel pump assembly (for high pressure side)) ·
Fuel pipe (fuel pump assembly (for high pressure side) - direct fuel injector assembly) ·
Direct fuel injector assembly ·
Fuel pump assembly (for high pressure side) ·
Fuel pump (for low pressure side) ·
Fuel pressure sensor (for high pressure side) ·
Fuel system ·
ECM |
Comes on | SAE Code: P0087 |
If the fuel pressure (for high pressure side) 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.
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 GTS on.
Based on the engine speed, engine load, injection mode 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 is NORMAL, the system is normal.
If the judgment result is 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 vehicle for fuel leaks, fumes, etc.
No fuel leaks present.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
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
Using the GTS, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.
| Tester Display |
|---|
| Target Fuel Pressure (Low) / Target Fuel Pressure 2 |
| Low Fuel Pressure Sensor |
Check the freeze frame data sets recorded the moment the DTC was stored and after the DTC was stored.
Using the freeze frame data, confirm the vehicle conditions when the DTC was stored, such as if the engine was idling with the shift state P, D or N or if the vehicle was being driven at a constant speed or accelerating.
Compare the difference in pressure between "Target Fuel Pressure (Low) /Target Fuel Pressure 2 and Low Fuel Pressure Sensor".
| Result | Proceed to |
|---|---|
| Difference between Target Fuel Pressure (Low) /Target Fuel Pressure 2 and Low Fuel Pressure Sensor is within 200 kPa | A |
| Difference between Target Fuel Pressure (Low) /Target Fuel Pressure 2 and Low Fuel Pressure Sensor is more than 200 kPa | B |
A
B
Start the engine and warm it up until the engine coolant temperature reaches 80°C (176°F) or higher.
| Tester Display |
|---|
| Coolant Temperature |
According to the display on the GTS, read the Data List with the Active Test "Control the Injection Mode" set to Direct.
| Active Test Display |
|---|
| Control the Injection Mode |
| Data List Display |
|---|
| Injection Mode |
| Misfire Count Cylinder #1 |
| Misfire Count Cylinder #2 |
| Misfire Count Cylinder #3 |
| Misfire Count Cylinder #4 |
| Injection Mode | Misfire Count | Proceed to |
|---|---|---|
| Direct | 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 direct fuel injector assembly.
A
B
Start the engine.
Check that the fuel pressure fluctuates when the engine condition changes from idling to racing.
| Tester Display |
|---|
| Fuel Pressure (High) |
| Result | Proceed to |
|---|---|
| Fuel pressure does not rise | A |
| Fuel pressure does not fluctuate | B |
| Fuel pressure fluctuates | C |
Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).
A
B
C
Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).
| Proceed to |
|---|
| OK |
| NG |
OK
NG
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Perform "Inspection After Repair" after replacing the fuel pump assembly (for high pressure side).
| Proceed to |
|---|
| NEXT |
NEXT
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 Confirmation Driving Pattern.
Read the DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTC P008700 is output | B |
A
B