P0088

2UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0088: Fuel Rail / System Pressure - Too High
P0088 - Fuel Rail / System Pressure - Too High

DESCRIPTION

Refer to DTC P0087 P0087.





MONITOR DESCRIPTION

To monitor an excessive fuel pressure in the direct fuel injection, the ECM measures the fuel pressure using the fuel pressure sensor.

If the sensor value is higher than the target fuel pressure value, the ECM interprets this as a malfunction. The ECM illuminates the malfunction indicator lamp (MIL) and sets the diagnosis trouble code (DTC) immediately.

If the sensor value does not vary immediately after the power switch is turned off, the ECM interprets this as a malfunction. When this malfunction is detected in consecutive driving cycles, the ECM illuminates the MIL and sets the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

Fuel pressure sensor too high





Fuel relief valve close stuck





TYPICAL MALFUNCTION THRESHOLDS

Fuel pressure sensor too high





Fuel relief valve close stuck





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
- When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.
- Read freeze frame data using the Techstream. 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, 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 P0088)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG) and turn the Techstream ON.

(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(d) Read the DTCs using the Techstream.

Result





HINT
If any codes other than P0088 are output, perform troubleshooting for those DTCs first.

B -- GO TO DTC CHART SFI System
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PRESSURE RELIEF VALVE OPEN)

(a) Put the engine in inspection mode Inspection Mode Procedure.

(b) Warm up the engine.

(c) Connect the Techstream to the DLC3.

(d) Turn the Techstream ON.

(e) Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Fuel Press and Coolant Temp and Battery Voltage.

HINT
- Coolant Temp value is 50°C (122°F) or more
- Battery Voltage value is 10 V or higher
- Fuel Press value is 2000 kPa or higher

(f) Turn the power switch on.

HINT
Before turning the power switch on, write down the Fuel Press value.

(g) Wait for 10 seconds.

(h) Put the engine in inspection mode.

(i) After starting the engine, turn the power switch on within 45 seconds.

(j) Wait for 10 seconds. Then turn the power switch on (IG).

(k) Enter the following menus: Powertrain / Engine and ECT / Active Test / Fuel Pressure Relief Valve Open / Primary / Fuel Press and Coolant Temp and Battery Voltage.

(l) Check if the Fuel Press value is stable.

HINT
Before performing the Active Test, check that the following conditions are met.

- Coolant Temp value is 50°C (122°F) or more
- Battery Voltage value is 10 V or higher
- Fuel Press value is 2000 kPa or higher

(m) Set Fuel Pressure Relief Valve Open to ON to open the fuel relief valve.

NOTICE:
- Wait 30 seconds after turning the power switch on (IG). If ON is selected before 30 seconds have passed, the Active Test will not operate.
- After selecting ON, the Active Test will turn OFF automatically after 2 seconds have passed.
- After ON is selected, ON will not be operable for 60 seconds.

(n) While performing the Active Test, check the fuel pressure.





Result





B -- INSPECT ECM (DSVR VOLTAGE)
A -- Continue to next step.

3. REPLACE FUEL PUMP (for High Pressure of Bank 1 and Bank 2)

(a) Replace fuel pump (for High Pressure of Bank 1 and Bank 2) Removal.

NEXT -- Continue to next step.

4. CHECK IF DTC OUTPUT REOCCURS (SEE IF DTC P0088 IS OUTPUT AGAIN)

(a) Clear DTCs DTC Check / Clear.

(b) Put the engine in inspection mode Inspection Mode Procedure.

(c) Connect the Techstream to the DLC3.

(d) Turn the Techstream ON.

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(f) Read the DTCs using the Techstream.

Result





B -- END

A -- REPLACE ECM Removal

5. INSPECT ECM (DSVR VOLTAGE)

(a) Put the engine in inspection mode Inspection Mode Procedure.

(b) Warm up the engine.

(c) Connect the Techstream to the DLC3.

(d) Turn the Techstream ON.

(e) Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Fuel Press and Coolant Temp and Battery Voltage.

HINT
- Coolant Temp value is 50°C (122°F) or more
- Battery Voltage value is 10 V or higher
- Fuel Press value is 2000 kPa or higher

(f) Turn the power switch on.

HINT
Before turning the power switch on, write down the Fuel Press value.

(g) Wait for 10 seconds.

(h) Put the engine in inspection mode Inspection Mode Procedure.

(i) After starting the engine, turn the power switch on within 45 seconds.

(j) Wait for 10 seconds. Then turn the power switch on (IG).

(k) Enter the following menus: Powertrain / Engine and ECT / Active Test / Fuel Pressure Relief Valve Open / Primary / Fuel Press and Coolant Temp and Battery Voltage.

(l) Check if the Fuel Press value is stable.

HINT
Before performing the Active Test, check that the following conditions are met.

- Coolant Temp value is 50°C (122°F) or more
- Battery Voltage value is 10 V or higher
- Fuel Press value is 2000 kPa or higher

(m) Set Fuel Pressure Relief Valve Open to ON to open the fuel relief valve.

NOTICE:
- Wait 30 seconds after turning the power switch on (IG). If ON is selected before 30 seconds have passed, the Active Test will not operate.
- After selecting ON, the Active Test will turn OFF automatically after 2 seconds have passed.
- After ON is selected, ON will not be operable for 60 seconds.

(n) After performing the Active Test, check the ECM voltage.





Result





C -- INSPECT FUSE (RELIEF VLV)

B -- REPLACE ECM
A -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 JUNCTION BLOCK - ECM)





(a) Remove the engine room No. 2 junction block.

(b) Disconnect the A13 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. REPLACE ENGINE ROOM NO. 2 JUNCTION BLOCK

NEXT -- CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

8. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

9. INSPECT FUSE (RELIEF VLV)

(a) Remove the RELIEF VLV fuse from the engine room No. 2 junction block.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE
OK -- Continue to next step.

10. INSPECT ENGINE ROOM NO. 2 JUNCTION BLOCK (RELIEF VLV RELAY)





HINT
RELIEF VLV cannot be removed and inspected, as it is part of the engine room No. 2 junction block internal circuit.

(a) Put the engine in inspection mode Inspection Mode Procedure

(b) Remove the terminal cover.

(c) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- REPLACE ENGINE ROOM NO. 2 JUNCTION BLOCK
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 JUNCTION BLOCK - FUEL RELIEF VALVE, FUEL RELIEF VALVE - BODY GROUND)

(a) Remove the engine room No. 2 junction block.





(b) Disconnect the E58 fuel relief valve connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

12. REPLACE FUEL RELIEF VALVE

(a) Replace the fuel relief valve Removal.

NEXT -- Continue to next step.

13. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

(a) Put the engine in inspection mode Inspection Mode Procedure.

(b) Warm up the engine.

(c) Connect the Techstream to the DLC3.

(d) Turn the Techstream ON.

(e) Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Fuel Press and Coolant Temp and Battery Voltage.

HINT
- Coolant Temp value is 50°C (122°F) or more
- Battery Voltage value is 10 V or higher
- Fuel Press value is 2000 kPa or higher

(f) Turn the power switch on.

HINT
Before turning the power switch on, write down the Fuel Press value.

(g) Wait for 10 seconds.

(h) Put the engine in inspection mode.

(i) After starting the engine, turn the power switch on within 45 seconds.

(j) Wait for 10 seconds. Then turn the power switch on (IG).

(k) Enter the following menus: Powertrain / Engine and ECT / Active Test / Fuel Pressure Relief Valve Open / Primary / Fuel Press and Coolant Temp and Battery Voltage.

(l) Check if the Fuel Press value is stable.

HINT
Before performing the Active Test, check that the following conditions are met.

- Coolant Temp value is 50°C (122°F) or more
- Battery Voltage value is 10 V or more
- Fuel Press value is 2000 kPa or more

(m) Set Fuel Pressure Relief Valve Open to ON to open the fuel relief valve.

NOTICE:
- Wait 30 seconds after turning the power switch on (IG). If ON is selected before 30 seconds have passed, the Active Test will not operate.
- After selecting ON, the Active Test will turn OFF automatically after 2 seconds have passed.
- After ON is selected, ON will not be operable for 60 seconds.

(n) While performing the Active Test, check the fuel pressure.

OK:

Fuel pressure decreases

NEXT -- END