Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0088 AND/OR P1229)

INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)

CHECK IF DTC OUTPUT RECURS

CHECK HARNESS AND CONNECTOR (SCV - ECM)

REPLACE COMMON RAIL ASSEMBLY

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 ConditionTrouble 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:
DTC P0088 and P1229 can be detected if the vehicle is driven at 50 km/h (31 mph) for 5 minutes.
For more information on the supply pump (suction control valve) and common rail system, refer to the system description .
When DTC P0088 and/or P1229 is set, check the internal fuel pressure of the common rail by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Fuel Press.
Reference:
Engine SpeedFuel Pressure
IdlingApproximately 37 to 43 MPa
3,000 rpm (No engine load)Approximately 60 to 66 MPa

MONITOR DESCRIPTION

P0088 (Internal fuel pressure too high):

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.


P1229 (Fuel over-feed):

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

P0088:
Required sensorFuel pressure sensor
Frequency of operationContinuous
Duration1 second
MIL operation1 driving cycle
P1229:
Required sensorFuel pressure sensor
Frequency of operationContinuous
Duration10 seconds
MIL operation1 driving cycle

TYPICAL ENABLING CONDITIONS

P0088:
Specification
The monitor will not run if the fuel pressure sensor or suction control valve circuit is malfunctioning.
P1229:
ItemSpecification
Target fuel pressure variationSmall
The monitor will not run if the fuel pressure sensor or suction control valve circuit is malfunctioning.

TYPICAL MALFUNCTION THRESHOLDS

P0088:
Detection CriteriaThreshold
Fuel pressure sensor200 MPa (2,039 kgf/cm2, 29,007 psi) or more
P1229:
Detection CriteriaThreshold
The internal fuel pressure of the common rail when the suction control valve is closed.Remains higher than target fuel pressure

WIRING DIAGRAM

Dtc P0088 Fuel Rail / System Pressure - Too High. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

  • NOTICE:
After replacing the ECM, the new ECM needs registration and initialization .
After replacing a supply pump, the ECM needs initialization .
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 P1229A
    P0190, P0192 and/or P0193B
B
GO TO DTC CHART
A
2.INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)
Dtc P0088 Fuel Rail / System Pressure - Too High. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E70 valve connector.

Measure the resistance of the suction control valve.

  • Standard resistance:
  • ConditionSpecified Condition
    20°C (68°F)1.9 to 2.3 Ω
NG
REPLACE SUPPLY PUMP ASSEMBLY
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 startA
    P1229B
B
REPLACE SUPPLY PUMP ASSEMBLY
A
4.CHECK HARNESS AND CONNECTOR (SCV - ECM)
Dtc P0088 Fuel Rail / System Pressure - Too High. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E70 valve connector.

Disconnect the E59 ECM connector.

Measure the resistance of the wire harness side connectors.

  • Standard resistance:
  • Tester ConnectionSpecified 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 ground10 kΩ or higher
    PCV- (E70-2) or PCV- (E59-41) - Body ground10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
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
    P0088A
    No outputB
B
SYSTEM IS OK
A
REPLACE ECM
LEXUS IS250, IS220d / GSE20 ALE20
2AD-FHV ENGINE CONTROL SYSTEM
Lexus IS250 IS220d GSE20 ALE20
ECD SYSTEM