Toyota Yaris: Sfi System / Fuel Rail / System Pressure - Too High (P008800)
DESCRIPTION
Refer to DTC P008700.
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| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P008800 | Fuel Rail / System Pressure - Too High | Although the ECM is requesting the fuel pump assembly (for high pressure side) to open the spill control valve, fuel pressure increases 3 MPa (30.6 kgf/cm2, 435 psi) from target pressure for about 10 seconds (1 trip detection logic). |
| Comes on | SAE: P0088 |
MONITOR DESCRIPTION
If the fuel pressure (for high pressure side) increases despite a decrease 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
- 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, 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.
HINT:
- 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: P008800.
-
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
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
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 OTHER DTCS OUTPUT (IN ADDITION TO DTC P008800) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes| Result | Proceed to |
|---|---|
| P008800 is output | A |
| P008800 and other DTCs are output | B |
HINT:
If any DTCs other than P008800 are output, troubleshoot those DTCs first.
| B |
 | GO TO DTC CHART |
|
| 2. | INSPECT FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) |
(a) Start the engine.
(b) Enter the following menus.
Powertrain > Engine > Data List| Tester Display |
|---|
| Fuel Pressure (High) |
(c) According to the display on the GTS, read the Data List while racing the engine.
OK:
Fuel pressure fluctuates.
HINT:
Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).
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| NG |
 | REPLACE FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) |
|
| 3. | 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
|
| 4. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
| 5. | CHECK IF DTC OUTPUT RECURS (SEE IF DTC P008800 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 |
| P008800 is output | B |
| A |
 | END |
| B |
 | REPLACE ECM |
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Fuel Gauge
The fuel gauge shows approximately how much fuel is remaining in the tank when the ignition is switched ON. We recommend keeping the tank over 1/4 full.
