Sfi System Fuel Pump Control Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING GTS (OPERATE C/OPN RELAY)

INSPECT CIRCUIT OPENING RELAY (C/OPN)

CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)

CHECK HARNESS AND CONNECTOR (C/OPN RELAY - NO. 1 INTEGRATION RELAY (EFI RELAY, IG2 RELAY))

CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP)

CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

INSPECT FUEL PUMP

CHECK ECM POWER SOURCE CIRCUIT

SFI SYSTEM - Fuel Pump Control Circuit


DESCRIPTION

When the engine is cranked, current flows from terminal ST1 of the ignition switch to the starter relay coil and current also flows to terminal STA of the ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned on, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr on (circuit opening relay on) and the fuel pump continues operating.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System.Sfi System Fuel Pump Control Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING GTS (OPERATE C/OPN RELAY)

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Check whether the fuel pump operation sound occurs when performing the Active Test on the tester.

    OK:
    Fuel pump operating sound occurs.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000000PDG10AX.html)

2.INSPECT CIRCUIT OPENING RELAY (C/OPN)

  1. Inspect the circuit opening relay (C/OPN) (LandCruiser RM000003BLB03PX_01_0010.html).



NG
REPLACE CIRCUIT OPENING RELAY (C/OPN)
OK


3.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)

  1. Disconnect the ECM connector.

  1. Remove the C/OPN relay from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 1 - G181-5 (FC)
    		Always
    		Below 1 Ω
    C/OPN relay terminal 1 or G181-5 (FC) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - ECM)
OK


4.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - NO. 1 INTEGRATION RELAY (EFI RELAY, IG2 RELAY))

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

  1. Remove the C/OPN relay from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 5 - 1B-4
    		Always
    		Below 1 Ω
    C/OPN relay terminal 2 - 1A-5
    		Always
    		Below 1 Ω
    C/OPN relay terminal 5 or 1B-4 - Body ground
    		Always
    		10 kΩ or higher
    C/OPN relay terminal 2 or 1A-5 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - NO. 1 INTEGRATION RELAY (EFI MAIN RELAY, IG2 RELAY))
OK


5.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP)

  1. Disconnect the fuel pump connector.

  1. Remove the C/OPN relay from the engine room relay block.

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

    Standard Resistance:
    for 5 Door
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 3 - S5-4 (B2)
    		Always
    		Below 1 Ω
    C/OPN relay terminal 3 or S5-4 (B2) - Body ground
    		Always
    		10 kΩ or higher
    for 3 Door
    Tester Connection
    		Condition
    		Specified Condition
    C/OPN relay terminal 3 - R38-1
    		Always
    		Below 1 Ω
    C/OPN relay terminal 3 or R38-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - FUEL PUMP)
OK


6.CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

  1. Disconnect the fuel pump connector.

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

    Standard Resistance:
    for 5 Door
    Tester Connection
    		Condition
    		Specified Condition
    S5-5 (E2) - Body ground
    		Always
    		Below 1 Ω
    for 3 Door
    Tester Connection
    		Condition
    		Specified Condition
    R38-2 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - BODY GROUND)
OK


7.INSPECT FUEL PUMP

  1. Inspect the fuel pump.

  1. for 5 Door (LandCruiser RM0000045QJ00BX.html).
  2. for 3 Door (LandCruiser RM0000045QN006X.html).
Result:
Result
Proceed to
OK
A
NG (for 5 Door)
B
NG (for 3 Door)
C


B
REPLACE FUEL PUMP (LandCruiser RM0000045QL00FX.html)

C
REPLACE FUEL PUMP (LandCruiser RM0000045QP00AX.html)
A


8.CHECK ECM POWER SOURCE CIRCUIT

  1. Check the ECM power source circuit (LandCruiser RM0000027690EIX.html).



NG
REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT
OK

REPLACE ECM (LandCruiser RM000000VW203EX.html)