THEFT DETERRENT SYSTEM, Diagnostic DTC:B276A

DTC Code DTC Name
B276A Short to GND in Tilt Sensor Signal Circuit

DESCRIPTION

This DTC is stored when terminal CSIF of the tilt sensor (yaw rate and acceleration sensor) has not received a signal for 5 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area
B276A Short to GND in Tilt Sensor Signal Circuit Terminal CSIF of tilt sensor (yaw rate and acceleration sensor) has not received signal for 5 seconds or more

  • Tilt sensor (Yaw rate and acceleration sensor)

  • Main body ECU (Multiplex network body ECU)

  • Wire harness or connector

WIRING DIAGRAM

B003YQNE02
*a from Auxiliary Battery
*b MPX-B NO. 2
*c Tilt Sensor (Yaw Rate and Acceleration Sensor)
*d Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

  • When replacing the tilt sensor (yaw rate and acceleration sensor), perform zero point calibration.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK TILT SENSOR (YAW RATE AND ACCELERATION SENSOR)


    1. Using an oscilloscope, check the waveform.

      B003XOOC04
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

      		 *b CSIF Initial Signal
      *c CSIF Initial Response *d Approximately 1.0 Second
      *e Initial Diagnosis *f Approximately 1.0 to 1.6 Seconds
      *g Approximately 0.05 Seconds *h Approximately 5.5 Seconds
      *i Disarmed State *j Arming Preparation State
      Measurement Condition
      Item Content
      Tester Connection K1-6 (GCS) - Body ground
      Tool Setting 2 V/DIV., 100 ms./DIV.
      Condition Theft deterrent system is set (system changes from disarmed state to arming preparation state)

      Tech Tips


      • If the tilt sensor (yaw rate and acceleration sensor) is normal, an initial response is output in response to the HI input from the main body ECU (multiplex network body ECU).

      • If the waveform output remains LO, there may be a problem with the main body ECU (multiplex network body ECU), as there is no input from the main body ECU (multiplex network body ECU).

      OK
      The waveform is output properly (HI is 6.5 V or higher and LO is below 1 V).
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK TILT SENSOR (YAW RATE AND ACCELERATION SENSOR)


    1. Disconnect the K85 tilt sensor (yaw rate and acceleration sensor) connector.

    2. Measure the voltage according to the value(s) in the table below.

      Measurement Condition
      Item Content
      Tester Connection K85-5 (CSIF) - K85-1 (GND)
      Condition Immediately after theft deterrent system is set
      Result
      Result Proceed to
      CSIF voltage is below 1 V when theft deterrent system is set A
      CSIF voltage is 6.5 V or higher when theft deterrent system is set B

    B

    REPLACE TILT SENSOR (YAW RATE AND ACCELERATION SENSOR) Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - TILT SENSOR (YAW RATE AND ACCELERATION SENSOR))


    1. Disconnect the K1 main body ECU (multiplex network body ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K1-6 (GCS) - K85-5 (CSIF) Always Below 1 Ω
      K1-6 (GCS) - Body ground Always 10 kΩ or higher
      K85-5 (CSIF) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR