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DI-220
                                                  DIAGNOSTICS        -   ANTI-LOCK BRAKE SYSTEM
                                                                                                                                    DI6SO-04




  DTC           C0278 / 11, C0279 / 12                  ABS Solenoid Relay Circuit

CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
    DTC No.                       DTC Detecting Condition                                                  Trouble Area
                 With IG1 terminal voltage at 8.5 V -19 V, when solenoid
   C0278 / 11    relay is turned ON, relay contact is OFF*1 for 0.2 sec. or       S ABS solenoid valve relay
                 longer.                                                          S ABS solenoid valve relay circuit
                 Immediately after IG1 is turned ON, when solenoid relay is       S Valve supply voltage
   C0279 / 12
                 turned OFF, relay contact is ON*2 for 0.2 sec. or longer.

*1 Relay contact OFF condition: When all solenoid supplied voltage are below 2.5 V.
*2 Relay contact ON condition: Any of voltage supplied by solenoid is 6 V or more.

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 :               390
                                                                                                   DI-221
                                        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 the TOYOTA hand-held tester.

   1     Check ABS solenoid 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 solenoid relay when operating it with the TOYOTA hand-held tester.
OK:
    The operation sound of the ABS solenoid relay should be heard.

                                                NG        Check and replace ABS actuator assembly.


   OK



   2     Check voltage between terminals +BS (2) and GND (1, 23) of ABS ECU.

                                              PREPARATION:
         LOCK                                 Disconnect the ABS ECU connector.
                                              CHECK:
           1                                  Measure the voltage between terminals 2 and 1, 23 of ABS
   (-)                                        ECU harness side connector.
                                              OK:
                                                   Voltage: 10 - 14 V
   (+)
           23
                     2               F08556




                                                NG        Check and replace ECU-IG 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 :            391



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