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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT SUPPLY PUMP ASSEMBLY

CHECK HARNESS AND CONNECTOR (SCV - ECM)

CHECK IF DTC OUTPUT REOCCURS (SEE IF DTC P0627 IS OUTPUT AGAIN)

DTC P0627 Fuel Pump Control Circuit / Open

DESCRIPTION

DTC No.DTC Detection ConditionTrouble Area
P0627 Open or short in suction control valve circuit for more than 0.5 seconds
(1 trip detection logic)
Open or short in suction control valve circuit
Suction control valve
ECM
  • HINT:
For more information on the supply pump (suction control valve) and the common rail system, refer to the system description .
When DTC P0627 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
2,500 rpm (No engine load)Approximately 60 to 66 MPa

WIRING DIAGRAM

Dtc P0627 Fuel Pump Control Circuit / Open. 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.INSPECT SUPPLY PUMP ASSEMBLY
Dtc P0627 Fuel Pump Control Circuit / Open. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E70 suction control 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
2.CHECK HARNESS AND CONNECTOR (SCV - ECM)
Dtc P0627 Fuel Pump Control Circuit / Open. 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
3.CHECK IF DTC OUTPUT REOCCURS (SEE IF DTC P0627 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
    P0627A
    No outputB
B
CHECK FOR INTERMITTENT PROBLEMS
A
REPLACE ECM
LEXUS IS250, IS220d / GSE20 ALE20
2AD-FHV ENGINE CONTROL SYSTEM
Lexus IS250 IS220d GSE20 ALE20
ECD SYSTEM