Sfi System - Fuel Pump Control Circuit

Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

2Uz-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 (operate circuit opening relay)

  6. Inspect circuit opening relay (marking: c/opn)

  7. Inspect ecm (fc voltage)

  8. Check ecm power source circuit

  9. Inspect fuel pump relay

  10. Inspect fuel pump

  11. Check harness and connector (fuel pump - fuel pump 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 resistor, fuel pump resistor - fuel pump)

SFI SYSTEM > Fuel Pump Control Circuit


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DESCRIPTION

Refer to DTC P0230 (Click here).

WIRING DIAGRAM

Refer to DTC P0230 (Click here).

INSPECTION PROCEDURE

1.CHECK FUEL PUMP OPERATION

  1. Check if there is pressure in the fuel inlet hose.

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


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

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.

  1. Check the relay operation when it is operated by the intelligent tester.

    Standard:
    Operating sound can be heard from the relay.


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Go to step 5
NG
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3.INSPECT CIRCUIT OPENING RELAY (Marking: C/OPN)
  1. Remove the circuit opening relay from the engine room relay block. 4Runner

  2. Remove the circuit opening relay from the engine room relay block.

  1. Measure the resistance of the circuit opening relay.

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

  1. Reinstall the circuit opening relay.



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REPLACE CIRCUIT OPENING RELAY
OK
next down

4.INSPECT ECM (FC VOLTAGE)
  1. Turn the ignition switch ON. 4Runner

  2. Turn the ignition switch ON.

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

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


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REPLACE ECM
NG
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CHECK AND REPAIR HARNESS OR CONNECTOR (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION SWITCH)

5.CHECK ECM POWER SOURCE CIRCUIT

  1. Check the ECM Power Source Circuit (Click here).



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REPAIR OR REPLACE
OK
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6.INSPECT FUEL PUMP RELAY
  1. Remove the fuel pump relay from the engine room relay block. 4Runner

  2. Remove the fuel pump relay from the engine room relay block.

  1. Measure the resistance of the fuel pump relay.

    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 is applied to terminals 1 and 2)
    3 - 5
    		Below 1 Ω
    (when battery voltage is applied to terminals 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

  1. Check fuel pump operation (Click here).



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REPLACE FUEL PUMP
OK
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8.CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY, FUEL PUMP - BODY GROUND)
  1. Check the harness and connector between the fuel pump and fuel pump relay.Disconnect the F14 fuel pump connector.Remove the fuel pump relay from the engine room R/B.Measure the resistance between the wire harness side connectors.Standard resistance (Check for open):Tester ConnectionSpecified ConditionFuel pump (F14-4) - Engine room R/B (Fuel pump relay terminal 4)Below 1 ΩStandard resistance (Check for short):Tester ConnectionSpecified ConditionFuel pump (F14-4) or Engine room R/B (Fuel pump relay terminal 4) - Body ground10 kΩ or higher 4Runner

  2. Check the harness and connector between the fuel pump and fuel pump 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 wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Fuel pump (F14-4) - Engine room R/B (Fuel pump relay terminal 4)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      Fuel pump (F14-4) or Engine room R/B (Fuel pump relay terminal 4) - Body ground
      		10 kΩ or higher

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

    1. Disconnect the F14 fuel pump connector.

    2. Measure the resistance between the wire harness side connector and body ground.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Engine room R/B (Fuel pump relay terminal 5) - Body ground
      		Below 1 Ω


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

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. Measure the resistance between the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    Circuit opening relay (3) - Engine room R/B (Fuel pump relay terminal 3)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    Circuit opening relay (3) or Engine room R/B (Fuel pump relay terminal 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 REPAIR HARNESS OR CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY)

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

  2. Remove the fuel pump relay from the engine room relay block.

  1. Measure the resistance of the fuel pump relay.

    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 is applied to terminals 1 and 2)
    3 - 5
    		Below 1 Ω
    (when battery voltage is applied to terminals 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 of the terminals.Resistance:0.70 to 0.76 Ω at 20°C (68°F) 4Runner

  2. Inspect the fuel pump resistor resistance.

    1. Measure the resistance of the terminals.

      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 RESISTOR, FUEL PUMP RESISTOR - 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 between the wire harness side connectors.Standard resistance (Check for open):Tester ConnectionSpecified ConditionEngine room R/B (Fuel pump relay terminal 5) - Fuel pump resistor (F8-1)Below 1 ΩStandard resistance (Check for short):Tester ConnectionSpecified ConditionEngine room R/B (Fuel pump relay terminal 5) or Fuel pump resistor (F8-1) - Body ground10 kΩ or higherReinstall the fuel pump relay.Reconnect 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 between the wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Engine room R/B (Fuel pump relay terminal 5) - Fuel pump resistor (F8-1)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      Engine room R/B (Fuel pump relay terminal 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 F8 fuel pump resistor connector.

    2. Disconnect the F14 fuel pump connector.

    3. Check the resistance between the wire harness side connectors.

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

  1. Reconnect the fuel pump resistor connector.

  1. 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