ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1381/97

DTC Code DTC Name
C1381/97 Acceleration Sensor Power Supply Voltage Malfunction

DESCRIPTION

This DTC is stored when the skid control ECU (brake booster with master cylinder assembly) receives a sensor supply voltage malfunction signal from the yaw rate and acceleration sensor (airbag ECU assembly). This DTC may also be stored due to a temporary power source voltage drop.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1381/97

Acceleration Sensor Power Supply Voltage Malfunction

601

While acceleration sensor communication is enabled, a supply voltage malfunction signal is received from the sensor for 10 seconds.

  • Acceleration sensor (Airbag ECU assembly) supply voltage shut down

  • Acceleration sensor (Airbag ECU assembly)

  • Skid control ECU (Brake booster with master cylinder assembly)

ABS DTC

WIRING DIAGRAM

C270520E57

CAUTION / NOTICE / HINT

Note:

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

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

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (IG2 TERMINAL)

    Note:

    • After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work.

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    • When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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    1. Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

    3. C233304C01

      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Airbag ECU Assembly))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    4. Disconnect the G92 yaw rate and acceleration sensor (airbag ECU assembly) connector.

    5. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

    6. Turn the power switch on (IG).

    7. Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G92-21 (IG2) - Body ground

      Power switch on (IG)

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (E TERMINAL)

    1. C233304C02

      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Airbag ECU Assembly))

      Turn the power switch off.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G92-25 (E1) - Body ground

      Always

      Below 1 Ω

      G92-26 (E2) - Body ground

      Always

      Below 1 Ω
      Note:

      Check the yaw rate and acceleration sensor signal after replacement.

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      Tip:

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.

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    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (E CIRCUIT)

    OK

  3. RECONFIRM DTC

    1. Reconnect the G92 yaw rate and acceleration sensor (airbag ECU assembly) connector.

    2. Clear the DTC.

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    3. Turn the power switch off.

    4. Turn the power switch on (READY).

    5. Perform a road test.

    6. Check if the same DTC is recorded.

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    Chassis > ABS/VSC/TRC > Clear DTCs

    Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1381/97 is not output

    A

    DTC C1381/97 is output

    B
    A

    USE SIMULATION METHOD TO CHECK

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    B

    REPLACE AIRBAG ECU ASSEMBLY

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