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                                                                                                                          DI-229
                                                     DIAGNOSTICS        -   ANTI-LOCK BRAKE SYSTEM
                                                                                                                           DI6SS-02




  DTC                  Always ON                           ABS ECU Malfunction

CIRCUIT DESCRIPTION
   DTC No.                           DTC Detecting Condition                                               Trouble Area
                                                                                 S Battery
                    Detection of any conditions in 1. and 2.:                    S Charging system
   Always ON        1. ABS ECU internal malfunction is detected.                 S Power source circuit
                    2. There is a malfunction in the ECU internal circuit        S ABS ECU
                                                                                 S ABS warning light circuit


INSPECTION PROCEDURE

   1     Check that the ABS ECU connectors are securely connected to the ABS ECU.


                                                                NO          Connect the connector to the ABS ECU.


  YES



   2     Is DTC output?

Check DTC on page DI-201 .

                                                               YES          Repair circuit indicated by the code output.


  NO



   3     Check voltage between terminals IG1 (3) and GND (1, 23) of ABS ECU connector.

                                                            PREPARATION:
         ON                                                 Disconnect ABS ECU connector.
                             3                              CHECK:
               1                                            (a) Turn the ignition switch ON.
   (+)                                                      (b) Measure voltage between terminals 3 and 1, 23 of ABS
                                                                 ECU harness side connector.
                                                            OK:
   (-)
               23                                                Voltage: 10 - 14 V
                                                  F08558



                                                                NG          Check for open and short circuit in harness and
                                                                            connector between ECU-IG fuse and ABS ECU
                                                                            (See page IN-29 ).

2002 ECHO (RM884U)

                                                                                  Author :                     Date :      399
DI-230
                                      DIAGNOSTICS   -   ANTI-LOCK BRAKE SYSTEM


  OK



   4     Check ABS warning light.

In case of using the TOYOTA hand-held tester:
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.
In case of not using the TOYOTA hand-held tester:
                                          PREPARATION:
        ON                                Disconnect ABS ECU connector.
                                          CHECK:
                                          (a) Using service wire, connect terminal WA (30) and GND (1,
           1
    (+)                                          23) of ABS ECU harness side connector.
                                          (b) Turn the ignition switch ON.
    (-)    23                             OK:
                                                 ABS warning light go off
                           30
                                   F10040

                                            OK          Check and replace ABS actuator assembly.


  NG



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




2002 ECHO (RM884U)

                                                              Author :           Date :            400



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