Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

1Gr-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Check fuel pump operation

  5. Perform active test by intelligent tester (operation of circuit opening relay)

  6. Inspect circuit opening relay

  7. Inspect ecm (fc voltage)

  8. Inspect ecm power source circuit

  9. Inspect fuel pump relay

  10. Inspect fuel pump assembly

  11. Check harness and connector (fuel pump - fuel pump relay relay, fuel pump - body ground)

  12. Check harness and connector (circuit opening relay - fuel pump relay)

  13. Inspect fuel pump relay

  14. Inspect fuel pump resistor (resistance)

  15. Check harness and connector (fuel pump relay - fuel pump)

SFI SYSTEM > Fuel Pump Control Circuit


​

DESCRIPTION

Refer to DTC P0230 (Click here)

WIRING DIAGRAM

Refer to DTC O0230 (Click here)

INSPECTION PROCEDURE

1.CHECK FUEL PUMP OPERATION

  1. Check if there is pressure in the fuel inlet hose (Click here).

    HINT:
    If there is fuel pressure, you will hear the sound of fuel flowing sound.


OKnext
Go to step 10
NG
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2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATION OF CIRCUIT OPENING RELAY)

  1. Connect the intelligent tester to the DLC3.

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

  1. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP/ SPD.

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

    OK:
    Operating sounds can be heard from the relay.


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Go to step 5
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3.INSPECT CIRCUIT OPENING RELAY
  1. Remove the circuit opening relay from the engine room R/B. 4Runner

  2. Remove the circuit opening relay from the engine room R/B.

  1. Check the circuit opening relay resistance.

    Standard resistance:
    Tester Connections
    		Specified Conditions
    3 - 5
    		10 kΩ or higher
    3 - 5
    		Below 1 Ω
    (when battery voltage applied to terminals 1 and 2)

  1. Reinstall the circuit opening relay.



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REPLACE CIRCUIT OPENING RELAY
OK
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4.INSPECT ECM (FC VOLTAGE)
  1. Turn the ignition switch on. 4Runner

  2. Turn the ignition switch on.

  1. Measure the voltage between the terminals of the E6 and E8 ECM connectors.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    FC (E8-10) - E1 (E6-1)
    		9 to 14 V


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REPLACE ECM
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CHECK AND REPLACE HARNESS OR CONNECTOR (ECM - IGNITION SWITCH)

5.INSPECT ECM POWER SOURCE CIRCUIT
HINT:
Refer to "ECM POWER SOURCE CIRCUIT" (Click here).


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REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT
OK
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6.INSPECT FUEL PUMP RELAY
  1. Remove the fuel pump relay the engine room R/B. 4Runner

  2. Remove the fuel pump relay the engine room R/B.

  1. Check the fuel pump relay resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 4
    		Below 1 Ω
    3 - 5
    		10 kΩ or higher
    3 - 4
    		10 kΩ or higher
    (when battery voltage applied to terminal 1 and 2)
    3 - 5
    		Below 1 Ω
    (when battery voltage applied to terminal 1 and 2)

  1. Reinstall the fuel pump relay.



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REPLACE FUEL PUMP RELAY
OK
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7.INSPECT FUEL PUMP ASSEMBLY
  1. Inspect fuel pump resistance.Disconnect the F14 fuel pump connector.Measure the resistance between terminals 4 and 5.Standard resistance:0.2 to 3.0 Ω at 20°C (68°F) 4Runner

  2. Inspect fuel pump resistance.

    1. Disconnect the F14 fuel pump connector.

    2. Measure the resistance between terminals 4 and 5.

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

  1. Inspect fuel pump operation.

    1. Apply battery voltage to both terminals. Check that the fuel 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.


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REPLACE FUEL PUMP ASSEMBLY
OK
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8.CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY RELAY, FUEL PUMP - BODY GROUND)
  1. Check the harness and connector between the fuel pump and circuit opening relay.Disconnect the F14 fuel pump connector.Remove the Fuel pump relay from the engine room R/B.Measure the resistance between the terminals of the fuel pump relay and fuel pump connector.Standard resistance (Check for open):Tester ConnectionsSpecified ConditionsFuel pump (F14-4) - Fuel pump relay (4)Below 1 ΩStandard resistance (Check for short):Tester ConnectionsSpecified ConditionsFuel pump (F14-4) or Fuel pump relay (4) - Body ground10 kΩ or higherReconnect the fuel pump connector.Reinstall the engine room junction block. 4Runner

  2. Check the harness and connector between the fuel pump and circuit opening relay.

    1. Disconnect the F14 fuel pump connector.

    2. Remove the Fuel pump relay from the engine room R/B.

    3. Measure the resistance between the terminals of the fuel pump relay and fuel pump connector.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      Fuel pump (F14-4) - Fuel pump relay (4)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      Fuel pump (F14-4) or Fuel pump relay (4) - Body ground
      		10 kΩ or higher

    4. Reconnect the fuel pump connector.

    5. Reinstall the engine room junction block.

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

    1. Disconnect the fuel pump connector.

    2. Measure the resistance between the terminal of the fuel pump connector and body ground.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      Fuel pump (F14-5) - Body ground
      		Below 1 Ω

    3. Reconnect the fuel pump connector.



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REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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9.CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP RELAY)
  1. Remove the circuit opening relay from the engine room R/B. 4Runner

  2. Remove the circuit opening relay from the engine room R/B.

  1. Remove the fuel pump relay from the engine room R/B.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    Circuit opening relay (3) - Fuel pump relay (3)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    Circuit opening relay (3) or Fuel pump relay (3) - Body ground
    		10 kΩ or higher

  1. Reinstall the circuit opening relay.

  1. Reinstall the fuel pump relay.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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CHECK AND REPLACE HARNESS OR CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY)

10.INSPECT FUEL PUMP RELAY
  1. Remove the fuel pump relay from the engine room R/B. 4Runner

  2. Remove the fuel pump relay from the engine room R/B.

  1. Check the fuel pump relay resistance.

    Standard resistance:
    Tester Connections
    		Specified Conditions
    3 - 4
    		Below 1 Ω
    3 - 5
    		10 kΩ or higher
    3 - 4
    		10 kΩ or higher
    (when battery voltage applied to terminal 1 and 2)
    3 - 5
    		Below 1 Ω
    (when battery voltage applied to terminal 1 and 2)

  1. Reinstall the fuel pump relay.



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REPLACE FUEL PUMP RELAY
OK
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11.INSPECT FUEL PUMP RESISTOR (RESISTANCE)
  1. Inspect the fuel pump resistor resistance.Measure the resistance.Standard resistance:0.70 to 0.76 Ω at 20°C (68°F) 4Runner

  2. Inspect the fuel pump resistor resistance.

    1. Measure the resistance.

      Standard resistance:
      0.70 to 0.76 Ω at 20°C (68°F)


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REPLACE FUEL PUMP RESISTOR
OK
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12.CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP)
  1. Check the harness and connector between the fuel pump relay and fuel pump resistor.Remove the fuel pump relay from the engine room R/B.Disconnect the F8 fuel pump resistor connector.Check the resistance.Standard resistance (Check for open):Tester ConnectionsSpecified ConditionsFuel pump relay (5) - Fuel pump relay resistor (F8-1)Below 1 ΩStandard resistance (Check for short):Tester ConnectionsSpecified ConditionsFuel pump relay (5) - or Fuel pump resistor (F8-1) - Body ground10 kΩ or higherReinstall the fuel pump relayReconnect the fuel pump resistor connector. 4Runner

  2. Check the harness and connector between the fuel pump relay and fuel pump resistor.

    1. Remove the fuel pump relay from the engine room R/B.

    2. Disconnect the F8 fuel pump resistor connector.

    3. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      Fuel pump relay (5) - Fuel pump relay resistor (F8-1)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      Fuel pump relay (5) - or Fuel pump resistor (F8-1) - Body ground
      		10 kΩ or higher

    4. Reinstall the fuel pump relay

    5. Reconnect the fuel pump resistor connector.

  1. Check the harness and connector between the fuel pump resistor and fuel pump.

    1. Disconnect the F18 fuel pump resistor connector.

    2. Disconnect the F14 fuel pump connector.

    3. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      Fuel pump resistor (F8-2) - Fuel pump (F14-4)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      Fuel pump resistor (F8-2) or Fuel pump (F14-4) - Body ground
      		10 kΩ or higher

    4. Reconnect the fuel pump resistor connector.

    5. Reconnect the fuel pump connector.



OKnext
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG
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REPAIR OR REPLACE HARNESS OR CONNECTOR