Sfi System - Fuel Pump Control Circuit

Brand:

Toyota

Model Name:

Camry ACV40 GSV40

Manual:

Repair Manual

Section:

2Az-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Perform active test using intelligent tester (operate c/opn relay)

  5. Check ecm power source circuit

  6. Inspect engine room j/b (c/opn relay)

  7. Inspect ecm (fc voltage)

  8. Inspect fuel pump

  9. Check harness and connector (c/opn relay - fuel pump - body ground)

SFI SYSTEM > Fuel Pump Control Circuit


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DESCRIPTION

In the diagram below, when the engine is cranked, current flows from terminal ST1 (STR) of the ignition switch (power source control ECU) to the starter relay (Marking: ST) coil and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit opening relay (Marking: C/OPN), 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 also keeps operating.

Connect the intelligent tester to the DLC3. Camry


WIRING DIAGRAM


Connect the intelligent tester to the DLC3. Camry


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE C/OPN RELAY)

  1. Connect the intelligent tester to the DLC3.

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

  1. Select the following menu items: 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.


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Go to step 2
OK
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PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.CHECK ECM POWER SOURCE CIRCUIT


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REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT
OK
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3.INSPECT ENGINE ROOM J/B (C/OPN RELAY)
  1. Remove the engine room J/B from the engine room R/B. Camry

  2. Remove the engine room J/B from the engine room R/B.

  1. Inspect the C/OPN relay.

    1. Measure the C/OPN relay resistance.

      Standard resistance:
      Tester Connection
      		Specified Condition
      1E-7 - 1E-13
      		10 kΩ or higher
      Below 1 Ω
      (Apply battery voltage between terminals 1D-12 and 1E-8)

  1. Reinstall the engine room J/B.



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REPLACE ENGINE ROOM J/B
OK
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4.INSPECT ECM (FC VOLTAGE)
  1. Disconnect the A24 and C24 ECM connectors. Camry

  2. Disconnect the A24 and C24 ECM connectors.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage between the terminals of the A24 and C24 ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    FC (A24-7) - E1 (C24-104)
    		9 to 14 V

  1. Reconnect the ECM connectors.



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REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BATTERY)
OK
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5.INSPECT FUEL PUMP


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REPLACE FUEL PUMP
OK
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6.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP - BODY GROUND)
  1. Check the harness and the connectors between the engine room J/B and the fuel pump.Remove the engine room J/B from the engine room R/B.Disconnect the 1E engine room J/B connector.Disconnect the N10 fuel pump connector.Measure the resistance between the terminals.Standard resistance (Check for open):Tester ConnectionSpecified Condition1E-13 - Fuel pump (N10-4)Below 1 ΩStandard resistance (Check for short):Tester ConnectionSpecified Condition1E-13 or Fuel pump (N10-4) - Body ground10 kΩ or higher Camry

  2. Check the harness and the connectors between the engine room J/B and the fuel pump.

    1. Remove the engine room J/B from the engine room R/B.

    2. Disconnect the 1E engine room J/B connector.

    3. Disconnect the N10 fuel pump connector.

    4. Measure the resistance between the terminals.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      1E-13 - Fuel pump (N10-4)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      1E-13 or Fuel pump (N10-4) - Body ground
      		10 kΩ or higher

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

    1. Disconnect the N10 fuel pump connector.

    2. Measure the resistance between the terminals.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Fuel pump (N10-5) - Body ground
      		Below 1 Ω

  1. Reconnect the fuel pump connector.

  1. Reconnect the engine room J/B connector.

  1. Reinstall the engine room J/B.



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REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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REPLACE ECM