Fuel Pump Control Circuit 1GR-FE

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FUEL PUMP)

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

REPLACE FUEL PUMP ECU

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

INSPECT CIRCUIT OPENING RELAY (C/OPN)

INSPECT CIRCUIT OPENING RELAY (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, INTEGRATION RELAY)

SFI system - Fuel Pump Control Circuit

Description. Fuel Pump Control Circuit

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 between 3 settings.

Wiring diagram

Refer to DTC P0230.

Inspection procedure

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to the Problem Symptoms Table .

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FUEL PUMP)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

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

  1. Check whether operating sounds can be heard while operating the relay using the tester.

    OK:

    Operating sounds can be heard from relay.

  NG  
Go to step 5
 
OK  
   

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

Disconnect the fuel pump ECU connector. SFI system - Fuel Pump Control Circuit. Land Cruiser 1GR-FE

  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 LHD
    Tester Connection Condition Specified Condition
    N2-5 (FPC) - C45-59 (FPC) Always Below 1 ?
    N2-4 (DI) - A38-19 (DI) Always Below 1 ?
    N2-6 (E) - Body ground Always Below 1 ?
    for RHD
    Tester Connection Condition Specified Condition
    N2-5 (FPC) - C46-59 (FPC) Always Below 1 ?
    N2-4 (DI) - A52-19 (DI) Always Below 1 ?
    N2-6 (E) - Body ground Always Below 1 ?

    Standard Resistance (Check for Short):

    for LHD
    Tester Connection Condition Specified Condition
    N2-1 (FP-) - Body ground Always 10 k? or higher
    N2-5 (FPC) or C45-59 (FPC) - Body ground Always 10 k? or higher
    N2-4 (DI) or A38-19 (DI) - Body ground Always 10 k? or higher
    for RHD
    Tester Connection Condition Specified Condition
    N2-1 (FP-) - Body ground Always 10 k? or higher
    N2-5 (FPC) or C46-59 (FPC) - Body ground Always 10 k? or higher
    N2-4 (DI) or A52-19 (DI) - Body ground Always 10 k? or higher
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   

3.REPLACE FUEL PUMP ECU

  1. Replace the fuel pump ECU .

NEXT  
   

4.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Check the fuel pump operation.

    OK:

    Malfunction has been repaired successfully.

  NG  
REPLACE ECM
 
OK  
   
END

5.INSPECT CIRCUIT OPENING RELAY (C/OPN)

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

  NG  
REPLACE CIRCUIT OPENING RELAY (C/OPN)
 
OK  
   

6.INSPECT CIRCUIT OPENING RELAY (POWER SOURCE VOLTAGE)

Remove the circuit opening relay (C/OPN) from the engine room relay block. SFI system - Fuel Pump Control Circuit. Land Cruiser 1GR-FE

  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 (2) - Body ground Ignition switch ON 11 to 14 V
    C/OPN relay (5) - Body ground Ignition switch ON 11 to 14 V
  NG  
Go to step 13
 
OK  
   

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

Remove the circuit opening relay (C/OPN) from the engine room relay block. SFI system - Fuel Pump Control Circuit. Land Cruiser 1GR-FE

  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 LHD
    Tester Connection Condition Specified Condition
    C/OPN relay (1) - A38-7 (FC) Always Below 1 ?
    C/OPN relay (3) - N2-3 (+B) Always Below 1 ?
    for RHD
    Tester Connection Condition Specified Condition
    C/OPN relay (1) - A52-7 (FC) Always Below 1 ?
    C/OPN relay (3) - N2-3 (+B) Always Below 1 ?

    Standard Resistance (Check for Short):

    for LHD
    Tester Connection Condition Specified Condition
    C/OPN relay (1) or A38-7 (FC) - Body ground Always 10 k? or higher
    C/OPN relay (3) or N2-3 (+B) - Body ground Always 10 k? or higher
    for RHD
    Tester Connection Condition Specified Condition
    C/OPN relay (1) or A52-7 (FC) - Body ground Always 10 k? or higher
    C/OPN relay (3) or N2-3 (+B) - Body ground Always 10 k? or higher
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   

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

Disconnect the fuel sender gauge connector. SFI system - Fuel Pump Control Circuit. Land Cruiser 1GR-FE

  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
    N1-4 (B2) - N2-2 (FP) Always Below 1 ?
    N1-5 (E2) - N2-1 (FP-) Always Below 1 ?

    Standard Resistance (Check for Short):

    Tester Connection Condition Specified Condition
    N1-4 (B2) or N2-2 (FP) - Body ground Always 10 k? or higher
    N1-5 (E2) or N2-1 (FP-) - Body ground Always 10 k? or higher
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   

9.INSPECT FUEL PUMP

  1. Inspect the fuel pump .

Result
Test Result Proceed to
OK A
NG (for Single Tank Type) B
NG (for Double Tank Type) C
  B  
REPLACE FUEL PUMP
 
  C  
REPLACE FUEL PUMP
 
A  
   

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

SFI system - Fuel Pump Control Circuit. Land Cruiser 1GR-FE

  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 LHD
    Tester Connection Condition Specified Condition
    N2-5 (FPC) - C45-59 (FPC) Always Below 1 ?
    N2-4 (DI) - A38-19 (DI) Always Below 1 ?
    N2-6 (E) - Body ground Always Below 1 ?
    for RHD
    Tester Connection Condition Specified Condition
    N2-5 (FPC) - C46-59 (FPC) Always Below 1 ?
    N2-4 (DI) - A52-19 (DI) Always Below 1 ?
    N2-6 (E) - Body ground Always Below 1 ?

    Standard Resistance (Check for Short):

    for LHD
    Tester Connection Condition Specified Condition
    N2-5 (FPC) or C45-59 (FPC) - Body ground Always 10 k? or higher
    N2-4 (DI) or A38-19 (DI) - Body ground Always 10 k? or higher
    for RHD
    Tester Connection Condition Specified Condition
    N2-5 (FPC) or C46-59 (FPC) - Body ground Always 10 k? or higher
    N2-4 (DI) or A52-19 (DI) - Body ground Always 10 k? or higher
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   

11.REPLACE FUEL PUMP ECU

  1. Replace the fuel pump ECU .

NEXT  
   

12.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Check the fuel pump operation.

    OK:

    Malfunction has been repaired successfully.

  NG  
REPLACE ECM
 
OK  
   
END

13.CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - IGN FUSE, INTEGRATION RELAY)

Remove the circuit opening relay (C/OPN) from the engine room relay block. SFI system - Fuel Pump Control Circuit. Land Cruiser 1GR-FE

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

  1. Remove the IGN fuse from the engine room relay block.

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the 1B integration relay connector.

  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 (2) - IGN fuse (2) Always Below 1 ?
    C/OPN relay (5) - 1B-4 Always Below 1 ?

    Standard Resistance (Check for Short):

    Tester Connection Condition Specified Condition
    C/OPN relay (2) or IGN fuse (2) - Body ground Always 10 k? or more
    C/OPN relay (5) or 1B-4 - Body ground Always 10 k? or more
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   
GO TO ECM POWER SOURCE CIRCUIT