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Home >> Toyota >> 2005 >> ECHO 2D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine - Diagnostics >> Circuit Inspection >> Fuel Pump Control Circuit >> Inspection Procedure

Inspection Procedure

Hand-held tester: 

  1. Connect the hand-held tester and check operation of fuel pump. 

    PREPARATION:

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch to ON and turn the hand-held tester ON.
    3. Select the following menu items; DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP /SPD.

    CHECK:

    Check the relay operation while operating it with the hand-held tester.

    Standard: Operating noise can be heard from the relay. 

    1. OK Proceed to next circuit inspection shown in  PROBLEM SYMPTOMS TABLE  . 
    2. NG GO TO NEXT STEP 
  2. Check ECM power source circuit (See  ECM POWER SOURCE CIRCUIT  ). 
    1. NG Repair or replace power source circuit. 
    2. OK GO TO NEXT STEP 
  3. Check circuit opening relay. 

    PREPARATION:

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

    CHECK:

    Check the circuit opening relay resistance.

    OK:

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    3-5 10 kΩ or higher
    3-5 Below 1 Ω (Apply battery voltage to terminals 1 and 2)
    Fig 1: Identifying EFI Relay Terminals And Circuit
    G02590749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Replace circuit opening relay. 
    2. OK GO TO NEXT STEP 
  4. Check voltage between terminals FC and E01 of ECM. 

    PREPARATION:

    Turn the ignition switch to ON.

    CHECK:

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

    OK:

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    FC (E4-10)-E01 (E6-7) 9 to 14 V
    Fig 2: Identifying ECM Connectors Terminals E4 And E6
    G02590750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK Go to   7 . 
    2. NG GO TO NEXT STEP 
  5. Check for open and short in harness and connectors 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:

    Check the resistance.

    OK:

    Fig 3: Identifying EFI Relay Terminals
    G02590751Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Tester Connection Specified Condition
    EFI relay terminal 3 of R/B - Circuit opening relay terminal 1 of J/B Below 1 Ω
    EFI relay terminal 3 of R/B - Circuit opening relay terminal 5 of J/B Below 1 Ω

    Standard (Check for short): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    EFI relay terminal 3 of R/B or Circuit opening relay terminal 1 of J/B - Body ground 10 kΩ or higher
    EFI relay terminal 3 of R/B or Circuit opening relay terminal 5 of J/B - Body ground
    Fig 4: Identifying Circuit Opening Relay Terminals
    G02590752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Repair or replace harness or connector. 
    2. OK GO TO NEXT STEP 
  6. Check for open and short in harness and connectors 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:

    Check the resistance.

    OK:

    Fig 5: Disconnecting E4 ECM Connector
    G02590753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Tester Connection Specified Condition
    FC (E4-10) - Circuit opening relay terminal 2 of J/B Below 1 Ω
    FC (E4-10) - Circuit opening relay terminal 5 of J/B

    Standard (Check for short): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    FC (E4-10) or Circuit opening relay terminal 2 of J/B - Body ground 10 kΩ or higher
    FC (E4-10) or Circuit opening relay terminal 2 of J/B - Body ground
    Fig 6: Identifying Circuit Opening Relay Terminals
    G02590754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Repair or replace harness or connector. 
    2. OK Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
  7. Check fuel pump (See  FUEL PUMP  ). 
    1. NG Repair or replace fuel pump. 
    2. 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. Remove the circuit opening relay from the instrument panel J/B.
    2. Disconnect the F10 fuel pump connector.

    CHECK:

    Check the resistance.

    OK:

    Fig 7: Identifying Circuit Opening Relay Terminals
    G02590755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Tester Connection Specified Condition
    Circuit opening relay terminal 3 of J/B - Fuel pump (F10-4) Below 1 Ω
    Fuel pump (F10-5) - Body ground

    Standard (Check for short): 

    TESTER CONNECTION AND 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 8: Identifying F10 Fuel Pump Connector
    G02590756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Repair or replace harness or connector. 
    2. OK Proceed to next circuit inspection shown  PROBLEM SYMPTOMS TABLE  . 

OBD II scan tool (excluding the hand-held tester): 

  1. Check operation of fuel pump. 

    PREPARATION:

    1. Turn the ignition switch to ON.
    2. 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 9: Identifying ECM Connectors Terminals FC And E01 Of E4 And E6
    G02590757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE: At this time, you will hear the fuel flowing sound.
    Fig 10: Checking Fuel Pressure In Fuel Inlet Hose
    G02590758Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK Proceed to next circuit inspection shown in  PROBLEM SYMPTOMS TABLE  . 
    2. NG GO TO NEXT STEP 
  2. Check ECM power source circuit (See  ECM POWER SOURCE CIRCUIT  ). 
    1. NG Repair or replace power source circuit. 
    2. OK GO TO NEXT STEP 
  3. Check circuit opening relay. 

    PREPARATION:

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

    CHECK:

    Check the circuit opening relay resistance.

    OK:

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    3-5 10 kΩ higher
    3-5 Below 1 Ω (when battery voltage applied to terminals 1 and 2)
    Fig 11: Identifying Circuit Opening Relay Terminals And Circuit
    G02590759Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Replace circuit opening relay. 
    2. OK GO TO NEXT STEP 
  4. Check voltage between terminal FC of E01 of ECM. 

    PREPARATION:

    Turn the ignition switch to ON.

    CHECK:

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

    OK:

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    FC (E4-10)-E01 (E6-7) 9 to 14 V
    Fig 12: Identifying ECM Connectors Terminals E4 And E6
    G02590760Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK Go to   7 . 
    2. NG 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:

    Check the resistance.

    OK:

    Fig 13: Identifying EFI Relay Terminals
    G02590761Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Tester Connection Specified Condition
    EFI relay terminal 3 of R/B - Circuit opening relay terminal 1 of J/B Below 1 Ω
    EFI relay terminal 3 of R/B - Circuit opening relay terminal 5 of J/B
    Fig 14: Identifying Circuit Opening Relay Terminals
    G02590762Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for short): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    EFI relay terminal 3 of R/B or Circuit opening relay terminal 1 of J/B - Body ground 10 kΩ or higher
    EFI relay terminal 3 of R/B or Circuit opening relay terminal 5 of J/B - Body ground
    1. NG Repair or replace harness or connector. 
    2. OK GO TO NEXT STEP 
  6. Check for open and short in harness and connectors 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:

    Check the resistance.

    OK:

    Fig 15: Disconnecting E4 ECM Connector
    G02590763Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Tester Connection Specified Condition
    FC (E4-10) - Circuit opening relay terminal 2 of J/B Below 1 Ω

    Standard (Check for short): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    FC (E4-10) or Circuit opening relay terminal 2 of J/B - Body ground 10 kΩ or higher
    Fig 16: Identifying Circuit Opening Relay Terminals
    G02590764Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Repair or replace harness or connector. 
    2. OK Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
  7. Check fuel pump assy (See  FUEL PUMP  ). 
    1. NG Repair or replace fuel pump assy. 
    2. OK GO TO NEXT STEP 
  8. Check for open and short in harness and connectors between circuit opening relay and fuel pump, fuel pump and body ground. 

    PREPARATION:

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

    CHECK:

    Check the resistance.

    Fig 17: Identifying Circuit Opening Relay Terminals
    G02590765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Tester Connection Specified Condition
    Circuit opening relay terminal 3 of J/B - Fuel pump (F10-4) Below 1 Ω
    Fuel pump (F10-5) - Body ground Below 1 Ω
    Fig 18: Identifying F10 Fuel Pump Connector Terminals
    G02590766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for short): 

    BRAKE PEDAL AND 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
    1. NG Repair or replace harness or connector. 
    2. OK Proceed to next circuit inspection shown in  PROBLEM SYMPTOMS TABLE  . 
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