THEFT DETERRENT SYSTEM, Diagnostic DTC:B2769

DTC Code DTC Name
B2769 Tilt Sensor Signal Circuit Malfunction

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
B2769

If one of the following is detected:


  • Tilt sensor (yaw rate sensor) power supply malfunction

  • Tilt sensor (yaw rate sensor) open malfunction

  • EEPROM malfunction

  • Tilt sensor (yaw rate sensor)

  • Certification ECU

  • Harness or connector

WIRING DIAGRAM

A000TSOE33
*a from Auxiliary Battery
*b Tilt Sensor (Yaw Rate Sensor)
*c Certification ECU

CAUTION / NOTICE / HINT

Note


  • If the certification ECU is replaced, refer to the Service Bulletin.

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

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TILT SENSOR [YAW RATE SENSOR] - BATTERY AND BODY GROUND)


    1. A000W0GE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Tilt Sensor [Yaw Rate Sensor])

      Disconnect the tilt sensor (yaw rate sensor) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L71-6 (+B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L71-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - TILT SENSOR [YAW RATE SENSOR])


    1. Disconnect the L16 certification ECU connector.

    2. Disconnect the L71 tilt sensor (yaw rate sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L16-21 (INCS) - L71-5 (CSIF) Always Below 1 Ω
      L16-21 (INCS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK TILT SENSOR (YAW RATE SENSOR) (CSIF)


    1. Using an oscilloscope, check the waveform.

      A000WJFE02
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU)

      		 *b CSIF Initial Signal
      *c CSIF Initial Response *d Approximately 1.0 seconds
      *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
      Tester Connection Content
      Tester Connection L16-21 (INCS) - 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 sensor) is normal, an initial response is output in response to the HI input from the certification ECU.

      • If the waveform output remains LO, there may be a problem with the certification ECU, as there is no input from the certification ECU.

      OK
      The waveform displays properly (HI is 6.5 V or higher and LO is below 1 V).
      Result
      Result Proceed to
      NG (Waveform output remains LO) A
      NG (There is no initial response and the waveform output remains HI) B
      OK (There is an initial response) C

    A

    REPLACE CERTIFICATION ECU

    B

    REPLACE TILT SENSOR (YAW RATE SENSOR) Click here

    C

    USE SIMULATION METHOD TO CHECK Click here