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Home >> Toyota >> 2004 >> ECHO 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Diagnostics >> DTC Tests >> Fuel Pump Control Circuit >> Inspection Procedure >> When not using hand-held tester:

When not using hand-held tester:

  1. Check operation of fuel pump. 

    PREPARATION: 

    1. (a) Turn the ignition switch ON. 
    2. (b) Connect between terminals FC and E01 of the E4 and E6 ECM connectors. 

    CHECK: 

    Check for fuel pressure in the fuel inlet hose when it is pinched off.

    RESULT: 

    There is pressure in fuel inlet hose.

    Fig 1: Connecting Between Terminals FC And E01 Of E4 And E6 ECM Connectors
    G02905410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    At this time, you will hear the fuel flowing sound.

    Fig 2: Checking Fuel Pressure In Fuel Inlet Hose
    G02905411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 

    NG: Go to next step. 

  2. Check ECM power source circuit (See  ECM POWER SOURCE CIRCUIT  ). 

    NG: Repair or replace power source circuit. 

    OK: Go to next step. 

  3. Check circuit opening relay. 

    PREPARATION: 

    Remove the circuit opening relay from the instrument panel J/B.

    CHECK: 

    Inspect the circuit opening relay.

    OK: 

    Fig 3: Inspecting Circuit Opening Relay
    G02905412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Specified Condition Table
    G02905413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Replace circuit opening relay. 

    OK: Go to next step. 

  4. Check voltage between terminal FC of E01 of ECM. 

    PREPARATION: 

    Turn the ignition switch ON.

    CHECK: 

    Measure the voltage between the specified terminals of the E4 and E6 ECM connectors.

    OK: 

    SPECIFIED CONDITION

    Tester Connection Specified Condition
    FC (E4-10) - E01 (E6-7) 9 to 14 V
    Fig 5: Checking Voltage Between Terminal FC Of E01 Of ECM
    G02905414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step   7 . 

    OK: Go to next step. 

  5. Check for open and short in harness and connector between EFI relay and circuit opening relay. 

    PREPARATION: 

    1. Remove the EFI relay from the engine room R/B. 
    2. Remove the circuit opening relay from the instrument panel J/B. 

    CHECK: 

    Measure the resistance between the wire harness side connectors.

    OK: 

    Standard (Check for open): 

    Fig 6: Removing EFI Relay From Engine Room R/B
    G02905415Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 7: Removing Circuit Opening Relay From Instrument Panel J/B
    G02905416Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for short): 

    Fig 8: Specified Condition Table (Check For Open)
    G02905417Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 9: Specified Condition Table (Check For Short)
    G02905418Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Repair or replace harness or connector. 

    OK: Go to next step. 

  6. Check for open and short in harness and connector between ECM and circuit opening relay. 

    PREPARATION: 

    1. Disconnect the E4 ECM connector. 
    2. Remove the circuit opening relay from the instrument panel J/B. 

    CHECK: 

    Measure the resistance between the wire harness side connectors.

    Fig 10: Identifying FC ECM Connector
    G02905419Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    Standard (Check for open): 

    SPECIFIED CONDITION

    Tester Connection Specified Condition
    FC (E4-10) - Circuit opening relay terminal 2 of J/B Below 1 Ω
    Fig 11: Removing Circuit Opening Relay From Instrument Panel J/B
    G02905420Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for short): 

    SPECIFIED CONDITION

    Tester Connection Specified Condition
    FC (E4-10) or Circuit opening relay terminal 2 of J/B - Body ground 10 kΩ or higher

    NG: Repair or replace harness or connector. 

    OK: Replace ECM (See  COMPONENTS  ). 

  7. Check fuel pump assy (See  ON-VEHICLE INSPECTION  ). 

    NG: Repair or replace fuel pump assy. 

    OK: Go to next step. 

  8. Check for open and short in harness and connector between circuit opening relay and fuel pump, fuel pump and body ground. 

    PREPARATION: 

    1. (a) Remove the circuit opening relay from the instrument panel J/B. 
    2. (b) Disconnect the F10 fuel pump connector. 

    CHECK: 

    Measure the resistance between the wire harness side connectors.

    OK: 

    Standard (Check for open): 

    Fig 12: Removing Circuit Opening Relay From Instrument Panel J/B
    G02905421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 13: Identifying F10 Fuel Pump Connector
    G02905422Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for short): 

    SPECIFIED CONDITION

    Tester Connection Specified Condition
    Circuit opening relay terminal 3 of J/B or Fuel pump (F10-4) - Body ground 10 kΩ or higher
    Fig 14: Specified Condition Table
    G02905423Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Repair or replace harness or connector. 

    OK: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 

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