LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2007 >> Corolla CE, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System (1ZZ-FE) >> SFI System >> Fuel Pump Control Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

When using intelligent tester: 

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATION OF CIRCUIT OPENING RELAY) 
    1. Connect an intelligent tester to the DLC3.
    2. Turn the ignition switch to ON and turn the tester ON.
    3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP/ SPD.
    4. Check whether operating sounds can be heard while operating the relay using the tester.

    OK: 

    Operating sounds can be heard from relay. 

    OK:  Go to step  7

    NG: Go to next step 

  2. INSPECT ECM POWER SOURCE CIRCUIT 
    1. Inspect the ECM power source circuit (See ECM POWER SOURCE CIRCUIT ).

    NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 

    OK: Go to next step 

  3. INSPECT CIRCUIT OPENING RELAY 
    1. Remove the C/OPN relay from the instrument panel J/B.
      Fig 1: Identifying C/OPN Relay Connector Terminals
      G05192682Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Check the C/OPN relay resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the circuit opening relay.

    NG: REPLACE CIRCUIT OPENING RELAY 

    OK: Go to next step 

  4. INSPECT ECM (FC VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E3 and E6 ECM connectors.
      Fig 2: Identifying E3 And E6 Connectors Terminals
      G05192683Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connections Specified Conditions
    FC (E6-10) - E1 (E3-5) Between 9 V and 14 V

    OK: REPLACE ECM 

    NG: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - CIRCUIT OPENING RELAY) 
    1. Disconnect the 110 ignition switch connector.
    2. Remove the C/OPN relay from the instrument panel J/B.
      Fig 3: Identifying C/OPN relay And I10 Connectors Terminals
      G05192684Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      IG2 (I10-6) - Instrument panel J/B (Circuit opening relay terminal 1) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      IG2 (I10-6) or Instrument panel J/B (Circuit opening relay terminal 1) - Body ground 10 kΩ or higher
    4. Reinstall the C/OPN relay.
    5. Reconnect the ignition switch connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY) 
    Fig 4: Checking Harness And Connector (ECM - Circuit Opening Relay)
    G05192685Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    1. Disconnect the E6 ECM connector.
    2. Remove the C/OPN relay from the instrument panel J/B.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      FC (E6-10) - Instrument panel J/B (Circuit opening relay terminal 2) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      FC (E6-10) or Instrument panel J/B (Circuit opening relay terminal 2) - Body ground 10 kΩ or higher
    4. Reinstall the C/OPN relay.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

  7. INSPECT FUEL PUMP 
    1. Inspect the fuel pump (See INSPECTION ).

    NG: REPLACE FUEL PUMP 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) 
    1. Remove the C/OPN relay from the instrument panel J/B.
    2. Disconnect the F10 fuel pump connector.
      Fig 5: Identifying Circuit Opening Relay And F10 Connectors Terminals
      G05192686Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      Instrument panel J/B (Circuit opening relay terminal 3) - Fuel pump (F10-4) Below 1 Ω
      Fuel pump (F10-5) - Body ground Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      Instrument panel J/B (Circuit opening relay terminal 3) or Fuel pump (F10-4) - Body ground 10 kΩ or higher
    4. Reconnect the fuel pump connector.
    5. Reinstall the C/OPN relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK AND REPAIR HARNESS AND CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) 

When Using OBD II Scan Tool: 

  1. CHECK FUEL PUMP (OPERATION) 
    1. Turn the ignition switch to ON.
    2. Connect terminals FC and E1 of the ECM connector.
      Fig 6: Identifying E3 And E6 Connectors Terminals
      G05192687Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Check for fuel pressure in the fuel inlet hose when it is pinched off.

    OK: 

    There is pressure in fuel inlet hose. 

    HINT:

    At this time, operating sounds can be heard from the fuel pump.

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

    NG: Go to next step 

  2. INSPECT ECM POWER SOURCE CIRCUIT 
    1. Inspect the ECM power source circuit (See ECM POWER SOURCE CIRCUIT ).

    NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 

    OK: Go to next step 

  3. INSPECT CIRCUIT OPENING RELAY 
    1. Remove the C/OPN relay from the instrument panel J/B.
    2. Check the C/OPN relay resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
    3. Reinstall the circuit opening relay.
      Fig 7: Identifying Circuit Opening Relay Connector Terminals
      G05192688Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPLACE CIRCUIT OPENING RELAY 

    OK: Go to next step 

  4. INSPECT ECM (FC VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E3 and E6 ECM connectors.
      Fig 8: Identifying E3 And E6 Connectors Terminals
      G05192683Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connections Specified Conditions
    FC (E6-10) - E1 (E3-5) Between 9 V and 14 V

    OK: REPLACE ECM 

    NG: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - CIRCUIT OPENING RELAY) 
    1. Disconnect the 110 ignition switch connector.
    2. Remove the C/OPN relay from the instrument panel J/B.
      Fig 9: Identifying C/OPN Relay And I10 Connectors Terminals
      G05192684Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      IG2 (I10-6) - Instrument panel J/B (Circuit opening relay terminal 1) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      IG2 (I10-6) or Instrument panel J/B (Circuit opening relay terminal 1) - Body ground 10 kΩ or higher
    4. Reinstall the C/OPN relay.
    5. Reconnect the ignition switch connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY) 
    1. Disconnect the E6 ECM connector.
    2. Remove the C/OPN relay from the instrument panel J/B.
      Fig 10: Identifying C/OPN Relay And E6 Connectors Terminals
      G05192691Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      FC (E6-10) - Instrument panel J/B (Circuit opening relay terminal 2) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      FC (E6-10) or Instrument panel J/B (Circuit opening relay terminal 2) - Body ground 10 kΩ or higher
    4. Reinstall the C/OPN relay.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. INSPECT FUEL PUMP 
    1. Inspect the fuel pump (See INSPECTION ).

    NG: REPLACE FUEL PUMP 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) 
    1. Remove the circuit opening relay from the instrument panel J/B.
    2. Disconnect the F10 fuel pump connector.
      Fig 11: Identifying Circuit Opening Relay And F10 Connectors Terminals
      G05192686Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      Instrument panel J/B (Circuit opening relay terminal 3) - Fuel pump(F10-4) Below 1 Ω
      Fuel pump (F10-5) - Body ground Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      Instrument panel J/B (Circuit opening relay terminal 3) or Fuel pump (F10-4) - Body ground 10 kΩ or higher
    4. Reconnect the fuel pump connector.
    5. Reinstall the C/OPN relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK AND REPAIR HARNESS AND CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) 

scientia non olet · About LEMON Manuals