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                                                                                                                    DI-231
                                                DIAGNOSTICS   -    ANTI-LOCK BRAKE SYSTEM
                                                                                                                     DI6ST-04




 ABS Warning Light Circuit

CIRCUIT DESCRIPTION
If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At
this time, the ECU records a DTC in memory.
Connect terminals Tc and CG of the DLC3 make the ABS warning light blink and output the DTC.

WIRING DIAGRAM


                                                                                                          ABS Actuator
                                                                                                          with ECU



                                 Combination Meter
                                                            17                     5               30
                                                                        P               P
                                                            C13                   ID3              A4     WA
                                   ABS
                                   Warning
                         2         Light                    14
          R-B                                                                    W-B
                        C14                                 C14



                        Instrument Panel J/B
                                                            Ignition Switch
                   13         GAUGE             4
                                                      B-Y
                   1G                           1O
                                                            2 IG1 AM1 1



                    1           AM1              8
                                                                  W-L
                   1G                           1O
                            1          2



                                                      Instrument Panel J/B
       B (*1)                                           2                   12
       B-G (*2)                            W-B
                                                       1O                   1F




                 FL Block
                                      Battery
                4 ALT

                                                                                            ID


         *1: Puerto Pico
         *2: Except Puerto Pico
                                                                                                                         F09222
                                                                                                                              F07
 2002 ECHO (RM884U)

                                                                            Author :             Date :              401
DI-232
                                       DIAGNOSTICS   -   ANTI-LOCK BRAKE SYSTEM

INSPECTION PROCEDURE
Troubleshoot in accordance with the table below for each trouble symptom.
ABS warning light does not light up                                               *1
ABS warning light remains on                                                      *2
*1: Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 2 in
case of not using TOYOTA hand-held tester.
*2: After inspection with step 3, start the inspection from step 4 in case of using the TOYOTA hand-held
tester and start from step 5 in case of not using TOYOTA hand-held tester.

   1       Check operation of the ABS warning light.

PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Check that "ON" and "OFF" of the ABS warning light can be shown on the combination meter by the
TOYOTA hand-held tester.

                                              OK         Check and replace ABS actuator assembly.


   NG




   2       Check ABS warning light.

See combination meter troubleshooting on page BE-2 .

                                              NG         Replace bulb or combination meter assembly.


   OK



  Check for open circuit in harness and connector between GAUGE fuse and ABS warning light.
  (See page IN-29 ).




2002 ECHO (RM884U)

                                                               Author :                Date :        402
                                                                                             DI-233
                                  DIAGNOSTICS   -   ANTI-LOCK BRAKE SYSTEM



   3    Check that the ECU connectors are securely connected to the ECU.


                                         NO         Connect the connector to the ECU.


  YES




   4    Check operation of the ABS warning light (See step 1).


                                         OK         Check and replace ABS actuator assembly.


  NG




   5    Is DTC output?

Check DTC on page DI-201 .

                                        YES         Repair circuit indicated by the code output.


  NO



 Check for short circuit in harness and connector between ABS warning light, DLC3 and ABS ECU
 (See page IN-29 ).




2002 ECHO (RM884U)

                                                          Author :           Date :            403



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