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05-488
                                                  DIAGNOSTICS        -   ABS WITH EBD & BA & TRAC & VSC SYSTEM              05CC8-04




    DTC           C1232/32 MALFUNCTION IN DECELERATION SENSOR

    DTC           C1234/34 MALFUNCTION IN YAW RATE SENSOR

    DTC           C1243/43 MALFUNCTION IN DECELERATION SENSOR

    DTC           C1244/44 OPEN OR SHORT IN DECELERATION
                           SENSOR CIRCUIT

    DTC           C1245/45 MALFUNCTION IN DECELERATION SENSOR

    DTC           C1381/97 MALFUNCTION IN POWER SUPPLY
                           VOLTAGE YAW/DECELERATION SENSOR

CIRCUIT DESCRIPTION
The yaw rate sensor signal is sent to the skid control ECU through CAN communication system. When there
is malfunction in communication, it will be detected by the diagnosis function.
    DTC No.                       DTC Detecting Condition                                                    Trouble Area
                While vehicle speed becomes 0 km/h (0 mph) from 30 km/h
                (18 mph), and the condition that GL1 and GL2 signals of
   C1232/32
                ECU terminals did not change 40 mV or less continued in a
                sequence 16 times.

   C1234 / 34   The      t           lf
                Th yaw rate sensor malfunction signal i received
                                          ti    i   l is    i d
                While vehicle speed becomes 0 km/h (0 mph) from 30 km/h
                (18 mph) or more, the condition that both GL1 and GL2
   C1243 / 43
                signals of ECU terminals do not change 2 LSB or more
                continued in a sequence 16 times.
                                                                                 S Y rate sensor
                                                                                   Yaw t
                S With vehicle speed at 0 km/h, after the difference of output
                                                                                 S Yaw rate sensor circuit
                  absolute value of G conversion value between decelera-         S Wire harness
                  tion sensor terminals GL1 and GL2 becomes 0.6 G or
   C1244 / 44
                  more, and the condition that does not become 0.4 G con-
                  tinues for 60 sec. or more.
                S Deceleration sensor malfunction signal is received.

                At the vehicle speed of 30 km/h (18 mph), the acceleration
                and deceleration values calculated from the deceleration
   C1245 / 45   sensor values and from vehicle speed are different, and the
                condition that the difference exceeds 0.35 G continues for
                60 sec. or more.
                With vehicle speed at 3 km/h or more, malfunction signal of
                                                                                 S Yaw rate sensor
   C1381 / 97   deceleration sensor terminal IG1 is received for 10 sec. or
                                                                                 S Yaw rate sensor power source circuit
                more.




2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                                   Author :                       Date :      671
                                                                                                                                 05-489
                                                  DIAGNOSTICS    -    ABS WITH EBD & BA & TRAC & VSC SYSTEM

WIRING DIAGRAM
   Y1                                                                                                                 Skid Control ECU
                                                               J17
   Yaw Rate Sensor                                                                                                    with Actuator
                             16 J/C 8                          J/C                    15    J/C   1                   11
                        B                            B                    B                                 B
        CANH                 J32    J31                                               J6          J5                  S3 CANH
                   3                                       C         C
                              8         16                                            1           15                  25
                       W                             W                    W                                  W
        CANL                 J32        J31                                           J6           J5                 S3 CANL
                  2                                      E            E
                             15          7
                       B-R                                                B-R
           IG                J32        J31
                   5                                                                       J42 J/C
           GND                                                  W-B                                   W-B
                   1                                                                   A          A
                              Driver Side J/B
                                                                                            J18
                                 IG1 Relay
                  1                               ECU-IG         23                         J/C
       W                                                                        B-R                B-R
                 1A                                              1L
                             5               3                                        87          8
                 29                                              16
       B-Y                                                                                   W-B
                 1H                                              1L
                             2               1
                                                                                      I15 Ignition SW
                                                   AM1           10
                                                                           W-L
                                                                 1H
                                                                                    1 AM1             IG1    2
                                                                              B-Y

                             FL Block
                       1                      1                                            W-B
           W
                       F7                    F6
                                 ALT                                                                         W-B
                             FL MAIN             W


                                                                          IE                                BL
                 Battery



                                                                                                                                   F45126



INSPECTION PROCEDURE
HINT:
When U0121/94, U0123/62, U0124/95 or U0126/63 are output accompanied with C1210/36 or C1336/39,
inspect and repair the trouble areas indicated by U0121/94, U0123/62, U0124/95 or U0126/63 first.
   1    CHECK SENSOR INSTALLATION(YAW RATE SENSOR)

                                                         NG           YAW  RATE                   SENSOR           IS     INSTALLED
                                                                      CORRECTLY

  OK




2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                                 Author :                    Date :               672
05-490
                                            DIAGNOSTICS   -   ABS WITH EBD & BA & TRAC & VSC SYSTEM

      2      CHECK TERMINAL VOLTAGE(IG AND GND OF YAW RATE SENSOR
             CONNECTOR)

                                                  (a)   Disconnect the yaw rate sensor connector.
                                    IG            (b)   Turn the ignition switch ON.
                                                  (c)   Measure the voltage between terminal IG and GND of the
                                                        yaw rate sensor connector.
                                                        OK:
                                                        Voltage: 10 to 14 V


            GND
                                         F45082
                                                    OK        REPLACE ABS & TRACTION ACTUATOR ASSY
                                                              (See page 32-46 )

      NG

      3      CHECK HARNESS AND CONNECTOR(YAW RATE SENSOR - ECU-IG FUSE, YAW
             RATE SENSOR - BODY GROUND)

(a)       Check for an open or short circuit in harness and connector between the yaw rate sensor and skid
          control ECU (See page 01-37 ).
                                                    NG        REPAIR OR         REPLACE         HARNESS   OR
                                                              CONNECTOR

      OK

  REPLACE YAW RATE SENSOR




 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                     Author :             Date :          673



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