ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1243,C1245,C1279 and C1418

DTC Code DTC Name
C1243 Deceleration Sensor
C1245 Malfunction in Deceleration Sensor
C1279 Abnormal Output Voltage in Deceleration Sensor (Test Mode DTC)
C1418 Open or Short in Deceleration Sensor

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the deceleration sensor. If the sensor functions abnormally, the ABS warning light turns on.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1243

Deceleration Sensor

While vehicle speed decreases from 30 km/h (18 mph) to 0 km/h (0 mph), sensor signal does not change 16 times or more.

  • Deceleration sensor

  • Deceleration sensor circuit

  • Skid control ECU (Brake actuator assembly)

C1245

Malfunction in Deceleration Sensor

At vehicle speed of 30 km/h (18 mph) or more, difference between back and forth G value calculated using G sensor signals and back and forth G value calculated using vehicle speed, exceeds 0.35 G for 60 seconds or more.

  • Deceleration sensor installation

  • Deceleration sensor

  • Deceleration sensor circuit

  • Skid control ECU (Brake actuator assembly)

C1279

Abnormal Output Voltage in Deceleration Sensor (Test Mode DTC)

Detected only during Test Mode.

  • Deceleration sensor installation

  • Deceleration sensor

C1418

Open or Short in Deceleration Sensor

One of the following conditions is met when the voltage at terminal IG1 is 9.5 V or higher:

  • The power supply voltage of the deceleration sensor is outside the range of 4.4 to 5.6 V for 1.2 seconds or more.

  • The value of GL1 is outside the range of -1.5 to 1.5 G for 1.2 seconds or more.

  • A deceleration sensor open circuit occurs 7 times or more.

  • Deceleration sensor installation

  • Deceleration sensor

  • Deceleration sensor circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A285528E09

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly) or deceleration sensor, perform deceleration sensor zero point calibration and CVT oil pressure calibration (for continuously variable transaxle).

K111:Click here

K111F:Click here

PROCEDURE

  1. CHECK DECELERATION SENSOR INSTALLATION

    1. Check that the deceleration sensor is installed properly.

      Click here

    Result

    Result

    Proceed to

    The sensor is tightened to the specified torque and the sensor is not tilted.

    A

    The sensor is not tightened to the specified torque or the sensor is tilted.

    B
    B

    DECELERATION SENSOR INSTALLATION

    Click here

    A

  2. READ VALUE USING GTS (DECELERATION SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    5. According to the display on the GTS, read the Data List.

    6. Check that the deceleration value of the deceleration sensor displayed on the GTS changes when the vehicle is tilted.

      OK

      Deceleration value changes.

      Result

      Proceed to

      OK

      NG

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Measurement Item

    Range

    Normal Condition

    Diagnostic Note

    Deceleration Sensor

    Deceleration sensor reading

    Min.: -18.525 m/s2, Max.: 18.387 m/s2

    -

    During deceleration/acceleration:

    Changes continuously

    for 2WD:

    The item is displayed on the GTS but not used.

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Deceleration Sensor
    NG

    INSPECT DECELERATION SENSORClick here

    OK

  3. RECONFIRM DTC

    1. Clear the DTC.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Drive the vehicle at a speed of 30 km/h (19 mph) or more for at least 60 seconds or more.

    4. Check if the same DTCs are recorded.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Proceed to

      DTC is output

      DTC is not output
    DTC is not output

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick here

    DTC is output

  4. INSPECT DECELERATION SENSOR

    1. Turn the ignition switch off.

    2. Remove the deceleration sensor.

      Click here

    3. Inspect the deceleration sensor.

      Click here

      Result

      Proceed to

      OK

      NG
    NG

    REPLACE DECELERATION SENSOR

    Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - DECELERATION SENSOR)

    1. Disconnect the A63 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A63-3 (GL1) - N5-1 (GL1)

      Always

      Below 1 Ω

      A63-26 (VGS) - N5-3 (VGS)

      Always

      Below 1 Ω

      A63-15 (GGND) - N5-2 (GGND)

      Always

      Below 1 Ω

      A63-3 (GL1) or N5-1 (GL1) - Body ground

      Always

      10 kΩ or higher

      A63-26 (VGS) or N5-3 (VGS) - Body ground

      Always

      10 kΩ or higher

      A63-15 (GGND) or N5-2 (GGND) - Body ground

      Always

      10 kΩ or higher

      Result

      Proceed to

      OK

      NG
    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR