Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 abswebdb cic12373

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DI-306
                                                DIAGNOSTICS       -   ABS WITH EBD & BA & TRAC & VSC SYSTEM
                                                                                                                   DI6O5-02




  DTC              C1237 / 37                        Wrong Number of Teeth at 1 of 4 Wheels

CIRCUIT DESCRIPTION
    DTC No.                      DTC Detecting Condition                                            Trouble Area
                Detection of any of conditions from 1. through 4.:
                1. When the ignition switch is ON, the speed difference
                   between the rear right and rear left wheels is 5 km/h
                   (3mph) or more (vehicle speed: 100 km/h (62 mph) or
                   less).
                2. When the ignition switch is ON, the slip difference be-   S Tire size
   C1237 / 37
                   tween the reference wheel and any other wheels is 6 %     S Speed sensor rotor
                   or more (vehicle speed: 100 km/h (62 mph) or more).
                3. Continuous ABS control for 60 sec. or more.
                4. Interference on 1 or more wheels for 20 sec. with the
                   brake pedal depressed, or for 5 sec. when the brake
                   pedal is not depressed.


INSPECTION PROCEDURE

   1      Check tire size.


                                                           NG         Replace tires so that all 4 tires are the same in
                                                                      size.


  OK



   2      Check sensor rotor (See page DI-275 ).


                                                           NG         Replace speed sensor rotor.


  OK



   3      Check speed sensor (See page DI-275 ).


                                                           NG         Replace speed sensor.


  OK



2001 SIENNA (RM787U)

                                                                               Author :                  Date :      460
                                                                                           DI-307
                                 DIAGNOSTICS   -   ABS WITH EBD & BA & TRAC & VSC SYSTEM



  4     Check for open and short circuit in harness and connector between front speed
        sensors, rear speed sensors and skid control ECU (See page IN-31 ).


                                        NG         Repair or replace harness and connector.


  OK



 Check and replace skid control ECU.




2001 SIENNA (RM787U)

                                                         Author :              Date :         461

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