ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1243/43, C1244/44, C1245/45, C1279/79

DTC Code DTC Name
C1243/43 Acceleration Sensor Stuck Malfunction
C1244/44 Open or Short in Deceleration Sensor Circuit
C1245/45 Acceleration Sensor Output Malfunction
C1279/79 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)

DESCRIPTION

This sensor detects vehicle deceleration. The sensor signal is used in ABS control. If the sensor functions abnormally, the ABS warning light turns ON.

DTC C1279/79 can be deleted when the deceleration sensor sends a deceleration sensor signal or the test mode ends. DTC C1279/79 is output only in the test mode.

DTC No. DTC Detection Condition Trouble Area
C1243/43

Following condition repeats 16 times:

GL1 does not change when vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph)

  • Deceleration sensor

  • Deceleration sensor circuit
C1244/44

When one of following (1 to 3) is detected:

1. Deceleration G calculated by ECU based on GL1 signal is not within -1.5 and 1.5 G for 1.2 sec.

2. When sensor operating voltage is not within 4.75 to 5.25 V

3. Deceleration sensor malfunction signal occurs more than 7 times

  • Deceleration sensor

  • Deceleration sensor circuit
C1245/45 Difference between value calculated from deceleration sensor value and vehicle speed exceeds 0.35 G for at least 60 seconds

  • Deceleration sensor

  • Deceleration sensor circuit
C1279/79 Detected only during test mode

  • Deceleration sensor

  • Sensor installation

WIRING DIAGRAM

A01J3EUE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHOOSE DIAGNOSIS METHOD


    1. Choose the diagnosis method.

      Method
      Method Proceed to
      Using intelligent tester A
      Not using intelligent tester B

    B

    INSPECT DECELERATION SENSOR Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (DECELERATION SENSOR 1)


    1. Check the Data List for proper functioning of the deceleration sensor.

      Skid control ECU
      Item Measurement Item / Range (Display) Normal Condition Diagnostic Note
      Deceleration Sensor 1

      Deceleration sensor 1

      reading / min.: -1.869 G, max.: 1.869 G

      		 Approx. 0 +-0.13 G when vehicle is not moving Reading changes when vehicle is shaken
      OK
      Deceleration value changes.

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY

    NG

  3. INSPECT DECELERATION SENSOR

    A01J5G5E01

    1. Remove the console box and deceleration sensor.

    2. Connect 3 dry cell batteries of 1.5 V in series.

      Tech Tips

      Do not apply 6 V or more to terminals 3 (VGS) and 2 (GGND).

    3. Check the output voltage of terminal 1 (GL1) when the sensor is tilted forward and rearward.

      Standard voltage
      Tester Connection Sensor Position Specified Condition
      1 (GL1) - Battery's negative (-) lead Horizontal Approx. 2.25 V
      1 (GL1) - Battery's negative (-) lead Tilted forward Approx. 0.45 to 2.25 V
      1 (GL1) - Battery's negative (-) lead Tilted rearward Approx. 2.25 to 4.05 V

      Tech Tips


      • If the sensor is tilted too much, it may output the wrong value.

      • If the voltage drops, the sensor should be replaced with a new one.

      • When replacing the sensor, it should not be placed upside down.


    NG

    REPLACE DECELERATION SENSOR

    OK

  4. CHECK WIRE HARNESS (SKID CONTROL ECU - DECELERATION SENSOR)

    A01J6LGE02

    1. Disconnect the S2 ECU connector.

    2. Disconnect the A29 sensor connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      S2-4 (GL1) - A29-1 (GL1) Below 1 Ω
      S2-7 (GGND) - A29-2 (GGND) Below 1 Ω
      S2-28 (VGS) - A29-3 (VGS) Below 1 Ω
      A29-1 (GL1) - Body ground 10 kΩ or higher
      A29-2 (GGND) - Body ground 10 kΩ or higher
      A29-3 (VGS) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  5. CHECK FOR DTC


    1. Install the deceleration sensor to the vehicle.

    2. Clear the DTCs.

    3. Drive the vehicle at 6 km/h (4 mph) or more.

    4. Check for DTCs.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY