Sfi System Fuel Pump Control Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING GTS (FUEL PUMP)

INSPECT CIRCUIT OPENING RELAY (C/OPN)

INSPECT CIRCUIT OPENING RELAY (C/OPN) (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - ECU, FUEL PUMP ECU)

CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)

INSPECT FUEL PUMP

CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND)

REPLACE FUEL PUMP ECU

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - IGN FUSE, NO. 1 INTEGRATION RELAY)

SFI SYSTEM - Fuel Pump Control Circuit


DESCRIPTION

The fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump ECU. Based on the signal sent from the ECM, the fuel pump ECU adjusts the fuel pump operation speed among 3 settings.

WIRING DIAGRAM

Refer to DTC P0230 (LandCruiser RM000000T8X0EWX_02.html).

INSPECTION PROCEDURE

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to Problem Symptoms Table (LandCruiser RM000000PDG103X.html).
1.PERFORM ACTIVE TEST USING GTS (FUEL PUMP)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

  1. Check whether the fuel pump operating sound occurs when performing the Active Test on the GTS.

    OK:
    Operating sounds can be heard from fuel pump.


NG
Go to step 2
OK

PROCEED TO PROBLEM SYMPTOMS TABLE (LandCruiser RM000000PDG103X.html)

2.INSPECT CIRCUIT OPENING RELAY (C/OPN)

  1. Inspect the circuit opening relay (C/OPN) (LandCruiser RM000003BLB03QX_01_0010.html).



NG
REPLACE CIRCUIT OPENING RELAY (C/OPN)
OK


3.INSPECT CIRCUIT OPENING RELAY (C/OPN) (POWER SOURCE VOLTAGE)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Remove the circuit opening relay (C/OPN) from the engine room relay block.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C/OPN relay terminal 2 - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    C/OPN relay terminal 5 - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    Text in Illustration
    *1
    		Engine Room Relay Block
    *2
    		Circuit Opening Relay (C/OPN)

  1. Reinstall the circuit opening relay (C/OPN).



NG
Go to step 10
OK


4.CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - ECU, FUEL PUMP ECU)

  1. Remove the circuit opening relay (C/OPN) from the engine room relay block.

  1. Disconnect the fuel pump ECU connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 1 - G55-5(FC)
    		Always
    		Below 1 Ω
    C/OPN relay terminal 3 - S8-4 (+B)
    		Always
    		Below 1 Ω
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 1 - G56-8(FC)
    		Always
    		Below 1 Ω
    C/OPN relay terminal 3 - S8-4 (+B)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 1 or G55-5 (FC) - Body ground
    		Always
    		10 kΩ or higher
    C/OPN relay terminal 3 or S8-4 (+B) - Body ground
    		Always
    		10 kΩ or higher
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 1 or G56-8 (FC) - Body ground
    		Always
    		10 kΩ or higher
    C/OPN relay terminal 3 or S8-4 (+B) - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the circuit opening relay (C/OPN).

  1. Reconnect the fuel pump ECU connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)

  1. Disconnect the fuel sender gauge connector.

  1. Disconnect the fuel pump ECU connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    S5-4 (B2) - S9-1 (FP)
    		Always
    		Below 1 Ω
    S5-5 (E2) - S9-2 (FP-)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    S5-4 (B2) or S9-1 (FP) - Body ground
    		Always
    		10 kΩ or higher
    S5-5 (E2) or S9-2 (FP-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the fuel sender gauge connector.

  1. Reconnect the fuel pump ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT FUEL PUMP

  1. Inspect the fuel pump (for Single Tank Type) (LandCruiser RM0000045QR00TX.html).

  1. Inspect the fuel pump (for Double Tank Type) (LandCruiser RM0000045QV009X.html).

Result
Test Result
Proceed to
OK
A
NG (for Single Tank Type)
B
NG (for Double Tank Type)
C
HINT:
for Automatic Transmission
Perform "Inspection After Repair" after replacing the fuel pump (LandCruiser RM000004NJC03SX.html).


B
REPLACE FUEL PUMP (LandCruiser RM0000045QT00YX.html)

C
REPLACE FUEL PUMP (LandCruiser RM0000045QX00BX.html)
A


7.CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND)

  1. Disconnect the fuel pump ECU connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    S8-1 (FPC) - G55-4 (FPC)
    		Always
    		Below 1 Ω
    S8-2 (DI) - G55-14 (DI)
    		Always
    		Below 1 Ω
    S8-3 (E) - Body ground
    		Always
    		Below 1 Ω
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    S8-1 (FPC) - G55-3 (FPC)
    		Always
    		Below 1 Ω
    S8-2 (DI) - G56-26 (DI)
    		Always
    		Below 1 Ω
    S8-3 (E) - Body ground
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    S8-1 (FPC) or G55-4 (FPC) - Body ground
    		Always
    		10 kΩ or higher
    S8-2 (DI) or G55-14 (DI) - Body ground
    		Always
    		10 kΩ or higher
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    S8-1 (FPC) or G55-3 (FPC) - Body ground
    		Always
    		10 kΩ or higher
    S8-2 (DI) or G56-26 (DI) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the fuel pump ECU connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.REPLACE FUEL PUMP ECU

  1. Replace the fuel pump ECU (LandCruiser RM0000045D4011X.html).


NEXT


9.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Check the fuel pump operation.

    OK:
    Malfunction has been repaired successfully.


NG
REPLACE ECM (LandCruiser RM00000329203TX.html)
OK

END

10.CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - IGN FUSE, NO. 1 INTEGRATION RELAY)

  1. Remove the circuit opening relay (C/OPN) from the engine room relay block.

  1. Remove the No. 1 integration relay from the engine room relay block.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 2 - 1A-5
    		Always
    		Below 1 Ω
    C/OPN relay terminal 5 - 1B-4
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 2 or 1A-5 - Body ground
    		Always
    		10 kΩ or more
    C/OPN relay terminal 5 or 1B-4 - Body ground
    		Always
    		10 kΩ or more

  1. Reinstall the circuit opening relay (C/OPN).

  1. Reinstall the No. 1 integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

GO TO ECM POWER SOURCE CIRCUIT (LandCruiser RM000001DN80BOX.html)