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cic1241


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DI-222
                                                       DIAGNOSTICS       -       ANTI-LOCK BRAKE SYSTEM
                                                                                                                                            DI6SP-04




  DTC                      C1241 / 41                       IG Power Source Circuit

CIRCUIT DESCRIPTION
This is the power source for the ECU, hence for the CPU, and ABS actuator.
    DTC No.                            DTC Detecting Condition                                                Trouble Area
                      Detection of any of conditions from 1. through 3.
                      1. With vehicle speed at 3 km/h or more, IG1 or +BS termi-
                         nal voltage is 8.5 V or below for 10 sec. or longer.
                                                                                     S Battery
                      2. With IG1 terminal voltage at 8.5 V or below, ABS sole-
   C1241 / 41                                                                        S Charging system
                         noid relay open, ABS motor relay open, solenoid fault
                                                                                     S Power source circuit
                         detecting condition are established.
                      3. +BS terminal voltage is 19 V or above for 1 sec. or long-
                         er


WIRING DIAGRAM

                                                                                                                             ABS Actuator
                                                           Instrument Panel J/B                                              with ECU
                      Ignition Switch
                                                      4          ECU-IG              3                               3
                   1                   2 B-Y                                                          B-L
                                                     1O                              1B                             A4 IG
                        AM1      IG1                             2           1

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


         4                                                B (*1)
                                    FL Block              B-G (*2)


                ALT         ABS

                                                                                                                     2
                       5                                                     B
                                                                                                                    A4 +BS
                                                                                                                    24
                                                                             B
                                                                                                                    A4 +BM


                                                                                                 BR                 1
                                                                                                                    A4 GND1
                                                                                                                    23
                                                                                                W-B                          GND2
                 Battery                                                                                            A4

                                                                                     EC
                            *1: Puerto Rico
                            *2: Except Puerto Rico
                                                                                                                                             F09224




2002 ECHO (RM884U)

                                                                                          Author :                 Date :                     392
                                                                                                DI-223
                                      DIAGNOSTICS   -   ANTI-LOCK BRAKE SYSTEM

INSPECTION PROCEDURE

   1      Check ECU-IG fuse.

            Instrument Panel J/B            PREPARATION:
                                            Remove ECU-IG fuse from Instrument Panel J/B.
                                            CHECK:
                                            Check continuity of ECU-IG fuse.
                                            OK:
                                                Continuity




  ECU-IG

                                   F08570

                                              NG        Check for short circuit in all the harness and
                                                        components connected to ECU-IG fuse (See at-
                                                        tached wiring diagram).


  OK



   2      Check battery positive voltage.

OK:
       Voltage: 10 - 14 V

                                              NG        Check and repair the charging system
                                                        (See page IN-29 ).

  OK



   3      Check voltage of the ECU IG power source.

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 DATALIST mode on the TOYOTA hand-held tester.
CHECK:
Check the voltage condition output from the ECU displayed on the TOYOTA hand-held tester.
OK:
     "Normal" is displayed.
2002 ECHO (RM884U)

                                                              Author :           Date :           393
DI-224
                                   DIAGNOSTICS   -   ANTI-LOCK BRAKE SYSTEM

In case of not using the TOYOTA hand-held tester:
                                      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



                                           OK        Check or replace ABS actuator assembly.


  NG



   4      Check continuity between terminals GND (1, 23) of ABS ECU connector and
          body ground.

                                         CHECK:
          LOCK                           Measure resistance between terminals 1 and 23 of ABS ECU
                  1                      harness side connector and body ground.
                                         OK:
    (+)                                       Resistance: 1  or less


    (-)
             23
                                F08559



                                           NG        Repair or replace harness or connector.


  OK



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




2002 ECHO (RM884U)

                                                           Author :           Date :           394



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