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 3.0 and 25 MPa (31 and 255 kgf/cm2, 435 and 3625 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.
| Required Sensors/Components | Fuel pressure sensor (for high pressure side) |
| 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.
Turn the ignition switch to ON.
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).
Start the engine.
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.
Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
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
In accordance with the display on the GTS, check the value of Freeze Frame Data item "Fuel Level" stored when the DTC was detected.
| Tester Display |
|---|
| Fuel Level |
| Freeze Frame Data Item | Standard |
|---|---|
| Fuel Level | Not Emp |
DTC P008700 may be stored if the engine stopped after running out of fuel or the vehicle temporarily ran out of fuel when the amount of fuel was low.
If Freeze Frame Data item "Fuel Level" is not displayed, based on the interview with the customer, check if the low fuel level warning was not displayed when the MIL illuminated.
| Proceed to |
|---|
| NEXT |
NEXT
Using the GTS, confirm the vehicle conditions recorded in the Freeze Frame Data which were present when the DTC was stored.
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.
| Tester Display |
|---|
| Target Fuel Pressure (Low) / Target Fuel Pressure 2 |
| Low Fuel Pressure Sensor |
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
Put the engine in Inspection Mode (Maintenance Mode).
| Tester Display |
|---|
| Inspection Mode |
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Enter the following menus.
| Active Test Display |
|---|
| Control the Injection Mode |
| Data List Display |
|---|
| Coolant Temperature |
| Injection Mode |
| Misfire Count Cylinder #1 |
| Misfire Count Cylinder #2 |
| Misfire Count Cylinder #3 |
| Misfire Count Cylinder #4 |
According to the display on the GTS, read the Data List with the Active Test "Control the Injection Mode" set to Direct.
| 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
Check the fuel pump operation (for low pressure side).
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
Discharge the fuel pressure.
DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.
Disconnect the fuel suction tube with pump and gauge assembly connector.
Disconnect the fuel (engine room side) pump assembly (for high pressure side) connector.
Put the engine in Inspection Mode (Maintenance Mode).
| Tester Display |
|---|
| Inspection Mode |
Start the engine.
After the engine has stopped on its own, turn the ignition switch off.
If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine.
Put the engine in Inspection Mode (Maintenance Mode).
| Tester Display |
|---|
| Inspection Mode |
Crank the engine again and make sure that the engine does not start.
Connect the fuel (engine room side) pump assembly (for high pressure side) connector.
Connect the fuel suction tube with pump and gauge assembly connector.
According to the display on the GTS, read the Data List.
| Tester Display |
|---|
| Fuel Pressure (High) |
Use the snapshot function to record the value displayed or make a note of it.
Put the engine in Inspection Mode (Maintenance Mode).
| Tester Display |
|---|
| Inspection Mode |
Start the engine.
Read the change in the Data List item "Fuel Pressure (High)" after discharging the fuel system pressure and after starting the engine.
| Tester Display |
|---|
| Fuel Pressure (High) |
The value of the Data List item "Fuel Pressure (High)" changes.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
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
DTC P008700 may be stored if the engine stopped after running out of fuel or the vehicle temporarily ran out of fuel when the amount of fuel was low.
B