SFI SYSTEM, Diagnostic DTC:P008700

DTC Code	DTC Name
P008700	Fuel Rail / System Pressure - Too Low

DESCRIPTION

The high-pressure direct injection fuel system consists of a spill control valve, check valve, fuel relief valve, fuel pressure sensor, fuel pump (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 (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 (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 2.3 and 30 MPa (23.5 and 305.9 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 (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 (for high pressure side)) Fuel pipe (fuel pump [for high pressure side] - fuel injector assembly) Fuel injector assembly Fuel pump (for low pressure side) Fuel pressure sensor (fuel delivery pipe) Fuel system ECM	Comes on	DTC stored	SAE Code: P0087

MONITOR DESCRIPTION

If the fuel pressure decreases despite an increase request signal being sent to the fuel pump (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
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

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.
Start the engine.
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.
Tip:
- 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
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tip:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

CAUTION / NOTICE / HINT

Tip:

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

CHECK FUEL LEAK

Check around and beneath the car for fuel leaks, fumes, etc.

OK

No fuel leaks present.

Result


Proceed to
OK
NG

REPAIR OR REPLACE FUEL LEAK POINT

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008700)

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.

Powertrain > Engine > Trouble Codes

Result


Result	Proceed to
DTC P008700 is output	A
DTC P008700 and other DTCs are output	B

Tip:

If any DTCs other than P008700 are output, troubleshoot those DTCs first.

GO TO DTC CHART

Click here

CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

Has the vehicle run out of fuel in the past?

Result


Proceed to
YES
NO

YES

DTC CAUSED BY RUNNING OUT OF FUEL

CHECK MISFIRE COUNT (INSPECT FUEL INJECTOR ASSEMBLY)

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.

Powertrain > Engine > Data List


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.

Result


Misfire Count	Proceed to
There are no misfire counts	A
3 cylinders or more have misfire counts	A
1 or 2 cylinders have misfire counts	B

Tip:

Perform "Inspection After Repair" after replacing the fuel injector assembly.

Click here

REPLACE FUEL INJECTOR ASSEMBLY

Click here

READ VALUE USING GTS (HIGH FUEL PRESSURE SENSOR)

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.

Powertrain > Engine > Data List


Tester Display
High Fuel Pressure Sensor

Check that the fuel pressure fluctuates when the engine condition changes from idling to racing.

Result


Result	Proceed to
Fuel pressure does not rise	A
Fuel pressure fluctuates	B
Fuel pressure does not fluctuate	C

REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)Click here

REPLACE FUEL DELIVERY PIPE (FUEL PRESSURE SENSOR)

Click here

CHECK FUEL PUMP OPERATION (FOR LOW PRESSURE SIDE)

Check the fuel pump operation (for low pressure side).
Click here

Result


Proceed to
OK
NG

GO TO FUEL PUMP CONTROL CIRCUIT

Click here

CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)

Check the fuel pressure (for low pressure side).
Click here

Result


Proceed to
OK
NG

REPAIR OR REPLACE FUEL SYSTEM (PRESSURE REGULATOR, PIPE LINE AND FILTER)

REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)

Replace the fuel pump (for high pressure side).
Click here

Tip:
Perform "Inspection After Repair" after replacing the fuel pump (for high pressure side).

Click here

Result


Proceed to
NEXT

CHECK IF DTC OUTPUT RECURS (SEE IF DTC P008700 IS OUTPUT AGAIN)

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
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.

Powertrain > Engine > Trouble Codes

Result


Result	Proceed to
DTC P008700 is output	A
DTCs are not output	B

REPLACE ECM

Click here

END