Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM
TYPICAL MALFUNCTION THRESHOLDS
CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0088 AND/OR P1229)
INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)
CHECK HARNESS AND CONNECTOR (SCV - ECM)
CHECK IF DTC OUTPUT RECURS (SEE IF DTC P0088 IS OUTPUT AGAIN)
DTC P0088 Fuel Rail / System Pressure - Too High
DTC P1229 Fuel Pump System
DESCRIPTION
| DTC No. | DTC Detection Condition | Trouble Area |
| P0088 | Internal fuel pressure of common rail is too high: Fuel pressure exceeds 200 MPa (2,039 kgf/cm2, 29,007 psi) (1 trip detection logic) |
Supply pump (suction control valve) Common rail assembly (pressure discharge valve) Short in supply pump (suction control valve) circuit ECM |
| P1229 | Fuel over-feed: Internal fuel pressure continues exceeding target fuel pressure despite ECM closing suction control valve (1 trip detection logic) |
Short in supply pump (suction control valve) circuit Supply pump (suction control valve) ECM |
- HINT:
| Engine Speed | Fuel Pressure |
| Idling | Approximately 37 to 43 MPa |
| 3,000 rpm (No engine load) | Approximately 60 to 66 MPa |
MONITOR DESCRIPTION
The ECM sets this DTC if the fuel pressure inside the common rail is more than 200 MPa (2,039 kgf/cm2, 29,007 psi). This DTC indicates that: 1) the suction control valve may be stuck open, 2) there may be a short in the suction control valve circuit.
If this DTC is set, the ECM enters fail-safe mode and limits the engine power. The fail-safe mode continues until the engine switch is turned OFF.
The ECM sets this DTC if the actual fuel pressure inside the common rail remains higher than the target fuel pressure, despite the ECM closing the suction control valve. This DTC indicates that the suction control valve may be stuck open, or there may be a short in its circuit. Under this condition, the pressure discharge valve operates frequently.
If this DTC is set, the ECM enters fail-safe mode and limits the engine power. The fail-safe mode continues until the engine switch is turned OFF.
MONITOR STRATEGY
| Required sensor | Fuel pressure sensor |
| Frequency of operation | Continuous |
| Duration | 1 second |
| MIL operation | 1 driving cycle |
| Required sensor | Fuel pressure sensor |
| Frequency of operation | Continuous |
| Duration | 10 seconds |
| MIL operation | 1 driving cycle |
TYPICAL ENABLING CONDITIONS
| Specification |
| The monitor will not run if the fuel pressure sensor or suction control valve circuit is malfunctioning. |
| Item | Specification |
| Target fuel pressure variation | Small |
| The monitor will not run if the fuel pressure sensor or suction control valve circuit is malfunctioning. | |
TYPICAL MALFUNCTION THRESHOLDS
| Detection Criteria | Threshold |
| Fuel pressure sensor | 200 MPa (2,039 kgf/cm2, 29,007 psi) or more |
| Detection Criteria | Threshold |
| The internal fuel pressure of the common rail when the suction control valve is closed. | Remains higher than target fuel pressure |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
| 1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0088 AND/OR P1229) |
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / DTC.
Read the DTCs.
- Result:
Display (DTC Output) Proceed to P0088 and/or P1229 A P0190, P0192 and/or P0193 B
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| A | |
| 2.INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE) |
Disconnect the E70 valve connector.
Measure the resistance of the suction control valve.
- Standard resistance:
Condition Specified Condition 20°C (68°F) 1.9 to 2.3 Ω
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| OK | |
| 3.CHECK IF DTC OUTPUT RECURS |
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / DTC / Clear.
Disconnect the suction control valve connector and then start the engine. Wait for 1 minute.
Enter the following menus: Powertrain / Engine / DTC.
Read the DTCs.
- Result:
Display (DTC Output) Proceed to No output or engine does not start A P1229 B
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| A | |
| 4.CHECK HARNESS AND CONNECTOR (SCV - ECM) |
Disconnect the E70 valve connector.
Disconnect the E59 ECM connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection Specified Condition PCV+ (E70-1) - PCV+ (E59-42) Below 1 Ω PCV- (E70-2) - PCV- (E59-41) Below 1 Ω PCV+ (E70-1) or PCV+ (E59-42) - Body ground 10 kΩ or higher PCV- (E70-2) or PCV- (E59-41) - Body ground 10 kΩ or higher
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| OK | |
| 5.REPLACE COMMON RAIL ASSEMBLY |
| NEXT | |
| 6.CHECK IF DTC OUTPUT RECURS (SEE IF DTC P0088 IS OUTPUT AGAIN) |
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the tester ON.
Clear DTCs.
Start the engine.
Enter the following menus: Powertrain / Engine / DTC.
Read the DTCs using the intelligent tester.
- Result:
Display (DTC output) Proceed to P0088 A No output B
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| A | ||
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