ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1243, C1245, C1279, C1381, C1418

DTC Code DTC Name
C1243 Acceleration Sensor Stuck Malfunction
C1245 Acceleration Sensor Output Malfunction
C1279 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)
C1381 Acceleration Sensor Power Supply Voltage Malfunction
C1418 Open or Short in Acceleration Sensor Circuit

DESCRIPTION

The skid control ECU (master cylinder solenoid) receives signals from the deceleration sensor. If the sensor functions abnormally, the ABS warning light turns on.

DTC Code DTC Detection Condition Trouble Area
C1243

The following condition repeats 16 times.


  • Sensor signal do not change when the vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph).

  • Deceleration sensor

  • Harness or connector

  • Skid control ECU (Master cylinder solenoid)
C1245

The following condition continues for at least 60 seconds.


  • The difference between the values calculated from the deceleration sensor value and vehicle speed exceeds 0.35 G.
C1381 At a vehicle speed of more than 3 km/h (2 mph), the deceleration sensor power source malfunction signal is received for 10 seconds or more.
C1418

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.
C1279 Stored during test mode.

WIRING DIAGRAM

A015DP1E02

INSPECTION PROCEDURE

Note

After replacing the deceleration sensor, perform zero point calibration Click here.

PROCEDURE


  1. CHECK DECELERATION SENSOR INSTALLATION


    1. Check that the deceleration sensor is installed properly.

      Result
      Result Proceed to

      The sensor is tightened to the specified torque.

      The sensor is not tilted.

      		 A

      The sensor is not tightened to the specified torque.

      Or the sensor is tilted.

      		 B

    B

    INSTALL DECELERATION SENSOR CORRECTLY Click here

    A

  2. READ VALUE USING GTS (DECELERATION SENSOR)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

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

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Deceleration Sensor

      Deceleration sensor reading / min.: -18.525 m/s2, max.: 18.387 m/s2

      Approximately -1.28 to 1.27 m/s2while stationary

      		 The reading changes when the vehicle is bounced.

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

      OK
      Deceleration value changes.

    NG

    INSPECT DECELERATION SENSOR Click here

    OK

  3. CHECK DTC


    1. Install the deceleration sensor to the vehicle.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

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

    5. Check if the same DTCs are output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  4. INSPECT DECELERATION SENSOR


    1. A015BFKE01
      Text in Illustration
      *a

      Component without harness connected

      (Deceleration Sensor)
      *b Front
      *c Tilted forward
      *d Tilted rearward

      Remove the deceleration sensor Click here.

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

      Note

      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 Condition Specified Condition
      1 (GL1) - Battery negative (-) lead Horizontal Approximately 2.5 V
      Tilted forward Approximately 0.5 to 2.5 V
      Tilted rearward Approximately 2.5 to 4.5 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 Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - DECELERATION SENSOR)


    1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

    2. Disconnect the E88 deceleration sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-39 (GL1) - E88-1 (GL1) Always Below 1 Ω
      A24-23 (GGND) - E88-2 (GGND) Always Below 1 Ω
      A24-22 (VGS) - E88-3 (VGS) Always Below 1 Ω
      E88-1 (GL1) - Body ground Always 10 kΩ or higher
      E88-2 (GGND) - Body ground Always 10 kΩ or higher
      E88-3 (VGS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK DTC


    1. Install the deceleration sensor to the vehicle.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

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

    5. Check if the same DTCs are output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here