DESCRIPTION
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 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 (24.5 and 204 kgf/cm2, 406 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):
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| Comes on | SAE: P0087 |
MONITOR DESCRIPTION
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.
MONITOR STRATEGY
Required Sensors/Components | Fuel pressure sensor (for high pressure side) |
Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
HINT:
GTS Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
CAUTION / NOTICE / HINT
HINT:
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.
PROCEDURE
1. | CHECK FUEL LEAK |
(a) Check around and beneath the vehicle for fuel leaks, fumes, etc.
OK:
No fuel leaks present.
NG | REPAIR OR REPLACE FUEL LEAK POINT |
|
2. | CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008700) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
P008700 is output | A |
P008700 and other DTCs are output | B |
HINT:
If any DTCs other than P008700 are output, troubleshoot those DTCs first.
B | GO TO DTC CHART |
|
3. | CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST |
(a) Has the vehicle run out of fuel in the past?
YES | DTC CAUSED BY RUNNING OUT OF FUEL |
|
4. | CHECK MISFIRE COUNT OF DIRECT INJECTION |
(a) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
(b) Enter the following menus.
Powertrain > Engine > Active Test Active Test Display |
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Control the Injection Mode |
Data List Display |
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Injection Mode |
Misfire Count Cylinder #1 |
Misfire Count Cylinder #2 |
Misfire Count Cylinder #3 |
(c) 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 | No misfire counts, or misfire counts occur randomly in all cylinders | A |
Misfire counts occur in a particular cylinder | B |
HINT:
Perform "Inspection After Repair" after replacing the direct fuel injector assembly.
Click here
B | REPLACE DIRECT FUEL INJECTOR ASSEMBLY |
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5. | INSPECT FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) |
(a) Enter the following menus.
Powertrain > Engine > Data List Tester Display |
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Fuel Pressure (High) |
(b) Start the engine.
(c) 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 does not fluctuate | B |
Fuel pressure fluctuates | C |
HINT:
Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).
Click here
B | REPLACE FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) |
C | GO TO STEP 8 |
|
6. | CHECK FUEL PUMP OPERATION (FOR LOW PRESSURE SIDE) |
(a) Check the fuel pump operation (for low pressure side).
Click here
HINT:
Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).
Click here
NG | GO TO FUEL PUMP CONTROL CIRCUIT |
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7. | CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE) |
(a) Check the fuel pressure (for low pressure side).
Click here
NG | REPAIR OR REPLACE FUEL SYSTEM |
|
8. | REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) |
Click here
HINT:
Perform "Inspection After Repair" after replacing the fuel pump assembly (for high pressure side).
Click here
|
9. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
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10. | CHECK IF DTC OUTPUT RECURS (SEE IF DTC P008700 IS OUTPUT AGAIN) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
DTCs are not output | A |
P008700 is output | B |
A | END |
B | REPLACE ECM |
WARNING
When removing the fuel-filler cap, loosen the cap slightly and wait for any hissing to stop, then remove it
Fuel spray is dangerous. Fuel can burn skin and eyes and cause illness if ingested. Fuel spray is released when there is pressure in the fuel tank and the fuel-filler cap is removed too quickly.