DESCRIPTION
MONITOR DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0088)
CHECK FREEZE FRAME DATA (FUEL PRESS)
INSPECT ECM (FUEL PRESSURE SENSOR OUTPUT VOLTAGE)
REPLACE FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)
BLEED AIR FROM FUEL SYSTEM
PERFORM FUEL SUPPLY PUMP INITIALIZATION
CHECK DTC OUTPUT
REPLACE ECM
REPAIR OR REPLACE HARNESS OR CONNECTOR
INSPECT ECM (FUEL PRESSURE SENSOR OUTPUT VOLTAGE)
REPLACE COMMON RAIL ASSEMBLY
BLEED AIR FROM FUEL SYSTEM
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
DTC P0088 Fuel Rail / System Pressure - Too High |
DESCRIPTION
P0088DTC Detection Drive Pattern
| DTC Detection Condition
| Trouble Area
|
After idling for 60 seconds, quickly increase engine speed to 2500 rpm repeatedly for 30 seconds
| The fuel pressure of the common rail exceeds 220000 kPa (2243 kgf/cm2, 31900 psi) (1 trip detection logic).
| - Suction control valve
- Pressure discharge valve (common rail assembly)
- Open or short in suction control valve circuit
- Fuel pressure sensor (common rail assembly)
- ECM
|
Related Data ListDTC No.
| Data List
|
P0088
| - Fuel Press
- Target Common Rail Pressure
- Target Pump SCV Current
|
- HINT:
- For more information on the fuel supply pump assembly (suction control valve) and common rail system, refer to System Description (HILUX_TGN26 RM000000XSN02CX.html).
- When DTC P0088 is stored, check the internal fuel pressure of the common rail by entering the following menus: Powertrain / Engine and ECT / Data List / Fuel Press.
ReferenceEngine Speed
| Fuel Press
|
Idling
| Approximately 30000 to 50000 kPa
|
3000 rpm (No engine load)
| Approximately 60000 to 95000 kPa
|
- Check "Fuel Press", "Target Common Rail Pressure" and "Target Pump SCV Current" in the freeze frame data.
MONITOR DESCRIPTION
- P0088 (Internal fuel pressure too high):
The ECM stores this DTC if the fuel pressure inside the common rail is higher than 220000 kPa (2243 kgf/cm2, 31900 psi). This DTC indicates that: 1) the suction control valve may be stuck open, or 2) there may be a short in the suction control valve circuit.
If this DTC is stored, the ECM enters fail-safe mode and limits the engine power. The ECM continues operating in fail-safe mode until the ignition switch is turned off.
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses of circuits related to this system before performing the following inspection procedure.
- After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK059X.html) and initialization (HILUX_TGN26 RM000000TIN057X.html).
- After replacing the fuel supply pump assembly, the ECM needs initialization (HILUX_TGN26 RM000000TIN057X.html).
- After replacing an injector assembly, the ECM needs registration (HILUX_TGN26 RM0000012XK059X.html).
- HINT:
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0088) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read Current DTCs.
ResultResult
| Proceed to
|
P0088 is output
| A
|
P0088 and "P0190, P0192 and/or P0193" are output
| B
|
- HINT:
- When there is an open circuit in the fuel pressure sensor circuit, the fuel pressure sensor outputs the maximum value. Therefore, P0088 may be stored together with DTCs which indicate common rail fuel pressure sensor circuit malfunctions.
2.CHECK FREEZE FRAME DATA (FUEL PRESS) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Record the stored DTCs and freeze frame data.
ResultResult
| Proceed to
|
Value of Fuel Press is shifting towards 160000 kPa or higher in 3rd and 4th set of freeze frame data
| B
|
Except above
| A
|
3.INSPECT ECM (FUEL PRESSURE SENSOR OUTPUT VOLTAGE) |
Connect the positive (+) probe of an oscilloscope to the fuel pressure sensor input terminal of the ECM connector and the negative (-) probe to the body ground.
Turn the ignition switch to ON.
Text in Illustration*a
| Component with harness connected (ECM)
|
Check for any noise in the waveform when vibration is applied to the wire harness and connectors between the fuel pressure sensor and ECM.
Text in Illustration*1
| Engine
| *2
| Engine Wire
|
*3
| Common Rail Assembly (Fuel Pressure Sensor)
| 4
| Wire to Wire
|
*5
| ECM
| -
| -
|
*a
| Vibration Method (Reference)
| -
| -
|
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
C113-16 (PCR1) - Body ground
| Vibration is applied to the wire harness and connectors
| No noise in the waveform
|
ResultResult
| Proceed to
|
MIL comes on or noise present in the waveform
| B
|
Except above
| A
|
4.REPLACE FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE) |
Replace the fuel supply pump assembly (HILUX_TGN26 RM0000014FO01PX.html).
- HINT:
- Before replacing the fuel supply pump assembly, check that the wire harness between the suction control valve and ECM is not shorted to ground.
- When there is a malfunction in the wire harness, Target Pump SCV Current is outside the range of 923 to 1123 mA when idling, and outside the range of 1013 to 1212 mA when the engine is running at 2500 rpm without load.
- If there are no problems with the engine condition during idling, it is not necessary to perform the above wire harness inspection.
- When the wire harness between the suction control valve and ECM is not shorted to ground, it can be assumed that DTC P0088 was stored due to a malfunction in the operation of the suction control valve. Therefore, it is necessary to replace the fuel supply pump assembly.
5.BLEED AIR FROM FUEL SYSTEM |
Bleed the air from the fuel system (HILUX_TGN26 RM000002SY802HX_01_0002.html).
6.PERFORM FUEL SUPPLY PUMP INITIALIZATION |
Perform fuel supply pump initialization (HILUX_TGN26 RM000000TIN057X.html).
Connect the intelligent tester to the DLC3.
Clear the DTCs (HILUX_TGN26 RM000000PDK0X3X.html).
Turn the ignition switch off for 30 seconds or more.
Turn the ignition switch to ON and start the engine.
After idling for 60 seconds, increase the engine speed from idling to 2500 rpm repeatedly for 30 seconds.
Confirm that the DTC is not output again.
- HINT:
- Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input DTC P0088.
Check the DTC judgment result.
ResultTester Display
| Result
| Proceed to
|
Pending DTC
| P0088 is output
| A
|
All Readiness
| NORMAL
| B
|
ABNORMAL
| A
|
- HINT:
- If STATUS is INCOMPLETE or N/A, race the engine to 2500 rpm repeatedly for 30 seconds and increase the idling time.
Replace the ECM (HILUX_TGN26 RM0000013Z001HX.html).
9.REPAIR OR REPLACE HARNESS OR CONNECTOR |
Repair or replace the harness or connector.
10.INSPECT ECM (FUEL PRESSURE SENSOR OUTPUT VOLTAGE) |
Connect the positive (+) probe of an oscilloscope to the fuel pressure sensor input terminal of the ECM connector and the negative (-) probe to the body ground.
Turn the ignition switch to ON.
Check for any noise in the waveform when vibration is applied to the wire harness and connectors between the fuel pressure sensor and ECM.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
C113-16 (PCR1) - Body ground
| Vibration is applied to the wire harness and connectors
| No noise in the waveform
|
Text in Illustration*a
| Component with harness connected (ECM)
|
ResultResult
| Proceed to
|
MIL comes on or noise present in the waveform
| A
|
Except above
| B
|
11.REPLACE COMMON RAIL ASSEMBLY |
Replace the common rail assembly (HILUX_TGN26 RM0000044W300GX.html).
12.BLEED AIR FROM FUEL SYSTEM |
Bleed the air from the fuel system (HILUX_TGN26 RM000002SY802HX_01_0002.html).
13.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Connect the intelligent tester to the DLC3.
Clear the DTCs (HILUX_TGN26 RM000000PDK0X3X.html).
Turn the ignition switch off for 30 seconds or more.
Turn the ignition switch to ON and start the engine.
After idling for 60 seconds, increase the engine speed from idling to 2500 rpm repeatedly for 30 seconds.
Confirm that the DTC is not output again.
- HINT:
- Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input DTC P0088.
Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, race the engine to 2500 rpm repeatedly for 30 seconds and increase the idling time.