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DI-218
                                                DIAGNOSTICS       -   ANTI-LOCK BRAKE SYSTEM
                                                                                                                                   DI6SN-04




  DTC           C0273 / 13, C0274 / 14                ABS Motor Relay Circuit

CIRCUIT DESCRIPTION
The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switches
the ABS motor relay ON and operates the ABS pump motor.
    DTC No.                      DTC Detecting Condition                                                   Trouble Area
                 Detection of any conditions in 1. and 2.:
                 1. When ABS motor relay is ON, relay contact is OFF for
   C0273 / 13       0.2 sec. or longer.
                 2. When ABS motor relay is turned ON, relay contact is
                    OFF for 0.5 sec. or longer.                                S ABS motor relay
                                                                               S ABS motor relay circuit
                                                                                       t     l    i it
                 Detection of any conditions in 1. and 2.:
                                                                               S ABS motor voltage
                 1. When ABS motor relay is OFF, relay contact is ON for
   C0274 / 14       0.2 sec. or longer.
                 2. When ABS motor relay is turned OFF, relay contact is
                    ON for 2 sec. or longer.


WIRING DIAGRAM

                                                                                                           ABS Actuator with ECU

                                              Fusible Link Block
                                                ALT           ABS                                      24
                                                                           5             B
                                                                                                       A4       +BM

                                                                                                       2
                                                                                             B
                                                                                                       A4 +BS




                                                                                                       1
                                                                                             BR
                                                                                                       A4 GND1

                                                                                                       23
                                                                                           W-B
                                                                                                       A4       GND2

                Battery
                                                      EC



                                                                                                                                    F09225




2002 ECHO (RM884U)

                                                                                 Author :                       Date :               388
                                                                                                   DI-219
                                        DIAGNOSTICS   -   ANTI-LOCK BRAKE SYSTEM

INSPECTION PROCEDURE
HINT:
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.

   1      Check ABS motor relay operation.

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 the operation sound of the ABS motor individually when operating it with the TOYOTA hand-held
tester.
OK:
      The operation sound of the ABS motor should be heard.

                                                NG        Check and replace ABS actuator assembly.


   OK



   2      Check voltage between terminals +BM (24) and GND (1, 23) of ABS ECU connec-
          tor.

                                              PREPARATION:
          LOCK                                Disconnect the ABS ECU connector.
                                              CHECK:
            1                                 Measure the voltage between terminals 24 and 1, 23 of ABS
    (+)                                       ECU harness side connector.
                                              OK:
                                                   Voltage: 10 - 14 V
    (-)
             23       24
                                     F08557

                                                NG        Check and replace ABS fuse.
                                                          Check and repair harness or connector.


   OK



  If the same code is still output after the DTC is deleted, check the contact condition of each con-
  nection. If the connection is normal, the ECU may be defective.




2002 ECHO (RM884U)

                                                                Author :           Date :            389



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