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                                                                                                               DI-141
                                           DIAGNOSTICS      -   ENGINE
                                                                                                                DI6VR-02




 Fuel Pump Control Circuit

CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay 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, 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.




                                                  EFI Main Relay Circuit Opening Relay           Fuel Pump
                  EFI

                         IG Switch

                                            IGN                                                     ECM

                  MAIN                                                                            FC
                                                                                                          Tr
                                                                         Starter Relay Starter
                         AM2
              MAIN
              FL                                ST
                                                                         From
                                                 ST
                                     Ignition         Park/Neutral       Crankshaft    (NE Signal) NE
                                     Switch           Position Switch    Position Sensor
               Battery
                                                                                      (STA Signal) STA




                                                                                                                 FI7241




 2002 ECHO (RM884U)

                                                                        Author :                 Date :         311
DI-142
                                                           DIAGNOSTICS       -   ENGINE

WIRING DIAGRAM
                     I10 Ignition Switch
              W-R         5              6   B-R
                               AM1 IG2


   1O 1                                            1O 6
                 Instrument                                Instrument
                 Panel J/B                                 Panel J/B                                                        ECM

      1A 7                                         1A 3
                               B-Y
          W-R                                B-R


      1               1                            1       1         Engine Room
                                                                     R/B No. 1
          2               2                            1   5
              AM2             EFI        EFI                                 Instrument Panel JB
                                         Relay                                      Circuit Opening
          1               1                            2    3                       Relay
                                                                                                    9               14     FC
                                                                                  1           2              G
                                                   1                                               1H               E4
      1                                                    1
B-L                 Engine Room                                         11                            6
                    R/B No. 1                                  B-Y                5            3            B-R
      F6 2                                                              1A                           1T
                 Fusible Link
          MAIN   Block
                                             W-B                                                             4
                                                                                                     F10
                                                                                                     Fuel
                                                                                                     Pump     5
              Battery
                                                   EC                                                       BG


                 A09141                                                                                                           A17562




2002 ECHO (RM884U)

                                                                                          Author :                Date :          312
                                                                                       DI-143
                                DIAGNOSTICS   -   ENGINE

INSPECTION PROCEDURE

TOYOTA hand-held tester:

  1     Connect the TOYOTA hand-held tester and check operation of fuel pump (See
        page DI-3 ).


                                       OK         Proceed to next circuit inspection shown on
                                                  problem symptoms table (See page DI-21 ).


  NG



  2     Check for ECM power source circuit (See page DI-138 ).


                                       NG         Repair or replace.


  OK



  3     Check circuit opening relay (Marking: CIR OPN) (See page SF-48 ).


                                       NG         Replace circuit opening relay.


  OK




2002 ECHO (RM884U)

                                                       Author :           Date :         313
DI-144
                                     DIAGNOSTICS   -   ENGINE



   4      Check voltage between terminal FC of ECM and body ground.

         ON                  FC            PREPARATION:
                                           (a) Remove the connector cover from the ECM.
                                           (b) Turn the ignition switch ON.
                                           CHECK:
                                           Measure voltage between terminal FC of the ECM and body
                                           ground.
                 (-)   (+)                 OK:
                                                Voltage 9 - 14 V
                                  A09047

                                             NG        Check for open in harness and connector be-
                                                       tween EFI main relay and circuit opening relay
                                                       and ECM (See page IN-29 ).


  OK



   5      Check fuel pump (See page SF-6 ).


                                             NG        Repair or replace fuel pump.


  OK



   6      Check for open in harness and connector between circuit opening relay (Mark-
          ing: CIR OPN) and fuel pump and body ground (See page IN-29 ).


                                             NG        Repair or replace harness or connector.


  OK



  Check and replace ECM (See page IN-29 ).




2002 ECHO (RM884U)

                                                                Author :        Date :           314
                                                                                                      DI-145
                                          DIAGNOSTICS   -   ENGINE

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

   1      Check operation of fuel pump.

         ON                  FC                 PREPARATION:
                                                (a) Remove the connector cover from the ECM.
                                                (b) Turn the ignition switch ON.
                                                CHECK:
                                                (a) Connect between terminal FC of the ECM connector and
                                                      body ground.
                                                (b) 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, you will hear a fuel return flowing noise.




                                                  OK        Proceed to next circuit inspection shown on
BE6653               Fuel Inlet Hose                        problem symptoms table (See page DI-21 ).
A09047
B09224                                 A09116




  NG



   2      Check for ECM power source circuit (See page DI-138 ).


                                                  NG        Repair or replace.


  OK



   3      Check circuit opening relay (Marking: CIR OPN) (See page SF-48 ).


                                                  NG        Replace circuit opening relay.


  OK




2002 ECHO (RM884U)

                                                                 Author :           Date :             315
DI-146
                                  DIAGNOSTICS   -   ENGINE



   4     Check voltage between terminal FC of ECM and body ground (See page
         DI-141 ).


                                         NG         Check for open in harness and connector be-
                                                    tween EFI main relay and circuit opening relay
                                                    and ECM (See page IN-29 ).


  OK



   5     Check fuel pump (See page SF-6 ).


                                         NG         Repair or replace fuel pump.


  OK



   6     Check for open in harness and connector between circuit opening relay (Mark-
         ing: CIR OPN) and fuel pump and body ground (See page IN-29 ).


                                         NG         Repair or replace harness or connector.


  OK



  Check and replace ECM (See page IN-29 ).




2002 ECHO (RM884U)

                                                             Author :        Date :           316



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