Sfi System (For Sedan) Fuel Pump Control Circuit

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

INSPECT MAIN BODY ECU (C/OPN RELAY INPUT VOLTAGE)

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY)

INSPECT MAIN BODY ECU (C/OPN RELAY)

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)

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

INSPECT FUEL PUMP

READ VALUE USING TECHSTREAM (STARTER SIGNAL)

READ VALUE USING TECHSTREAM (ENGINE SPEED)

SFI SYSTEM (for Sedan) - Fuel Pump Control Circuit


DESCRIPTION

When the engine is cranked, the starter relay drive signal output from the STAR terminal of the ECM is input into the STA terminal of the ECM, and NE signal generated by the crankshaft position sensor is also input into the NE+ terminal. Thus, the ECM interprets that the engine is cranked, and turns the transistor Tr1 in the ECM internal circuit ON. The current flows to the C/OPN (Circuit Opening) relay by turning the Tr1 ON. Then, the fuel pump operates.
While the NE signal is input into the ECM, when engine is running, the ECM turns the Tr1 on continuously.

Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Fuel Pump Control Circuit


WIRING DIAGRAM


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) 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 TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream 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 perform the Active Test on the Techstream.

    OK:
    Fuel pump operating sound occurs.
    Result
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
Go to step 8
A


2.INSPECT MAIN BODY ECU (C/OPN RELAY INPUT VOLTAGE)


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Fuel Pump Control Circuit

  1. Measure the voltage between the terminal of the main body ECU and the body ground when the ignition switch is turned to ON and OFF.

    Standard voltage:
    Tester Connections
    		Switch Conditions
    		Specified Conditions
    4B-11 - Body ground
    		Ignition switch off
    		Below 1 V
    4F-4 - Body ground
    4B-11 - Body ground
    		Ignition switch ON
    		11 to 14 V
    4F-4 - Body ground
    Result
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
Go to step 4
A


3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Fuel Pump Control Circuit

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

  1. Disconnect the main body ECU connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    1B-4 - 4F-4
    		Below 1 Ω
    1A-4 - 4B-11
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    4F-4 - Body ground
    		10 kΩ or higher
    4B-11 - Body ground

  1. Reinstall the integration relay.

  1. Reconnect the main body ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

GO TO ECM POWER SOURCE CIRCUIT (YARIS_NCP93 RM000001DN805UX.html)

4.INSPECT MAIN BODY ECU (C/OPN RELAY)


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Fuel Pump Control Circuit

  1. Remove the main body ECU.

  1. Check the C/OPN relay resistance.

    Standard resistance:
    Tester Connections
    		Specified Conditions
    4B-11 - 4A-8
    		10 kΩ or higher
    Below 1 Ω
    (when battery voltage is applied to terminals 4F-4 and 4E-5)
    HINT:
    Relay coil circuit between 4F-4 and 4E-5 is not through IGN fuse.

  1. Reinstall the main body ECU.



NG
REPLACE MAIN BODY ECU
OK


5.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Fuel Pump Control Circuit

  1. Disconnect the A21 ECM connector.

  1. Disconnect the 4E connector from main body ECU.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    Main Body ECU (4E-5) - FC (A21-7)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    Main body ECU (4E-5) or FC (A21-7) - Body ground
    		10 kΩ or higher

  1. Reconnect the main body ECU and the ECM connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP - BODY GROUND)


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Fuel Pump Control Circuit

  1. Check the harness and the connectors between the main body ECU and the fuel pump.

    1. Disconnect the 4A main body ECU connector.

    2. Disconnect the J5 fuel pump connector.

    3. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      Main body ECU (4A-8) - Fuel pump (J5-4)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      Main body ECU (4A-8) or Fuel pump (J5-4) - Body ground
      		10 kΩ or higher

  1. Check the harness and the connectors between the fuel pump and the body ground.

    1. Disconnect the J5 fuel pump connector.

    2. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      Fuel pump (J5-5) - Body ground
      		Below 1 Ω

  1. Reconnect the main body ECU connector.

  1. Reconnect the fuel pump connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.INSPECT FUEL PUMP


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Sedan) Fuel Pump Control Circuit

  1. Inspect fuel pump resistance.

    1. Measure the resistance between the terminals.

      Standard resistance:
      0.2 to 3.0 Ω at 20°C (68°F)

  1. Inspect fuel pump operation.

    1. Apply the battery voltage to both the terminals. Check that the pump operates.

      NOTICE:
      1. These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
      2. Keep the fuel pump as far away from the battery as possible.
      3. Always switch at the battery side.


NG
REPLACE FUEL PUMP (YARIS_NCP93 RM000001JUN00MX.html)
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

8.READ VALUE USING TECHSTREAM (STARTER SIGNAL)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

  1. Check the result when the ignition switch is turned to ON and START.

    OK:
    Ignition Switch Position
    		Starter Signal
    ON
    		Close (Starter signal OFF)
    START
    		Open (Starter signal ON)


NG
REPAIR OR REPLACE STARTING SYSTEM (YARIS_NCP93 RM000000WZ3082X.html)
OK


9.READ VALUE USING TECHSTREAM (ENGINE SPEED)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.

  1. Read the values displayed on the Techstream while cranking.

    OK:
    Values are displayed continuously.


NG
REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR CIRCUIT (YARIS_NCP93 RM000000TCW0MCX.html)
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)