Dtc C1243 Acceleration Sensor Stuck Malfunction

Brake. Land Cruiser. Urj200, 202 Grj200 Vdj200
Brake Control Dynamic Control Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DECELERATION SENSOR INSTALLATION

READ VALUE USING GTS (DECELERATION SENSOR)

CHECK DTC

INSPECT DECELERATION SENSOR

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

CHECK DTC

DTC C1243 Acceleration Sensor Stuck Malfunction

DTC C1245 Acceleration Sensor Output Malfunction

DTC C1279 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)

DTC C1381 Acceleration Sensor Power Supply Voltage Malfunction

DTC 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.
  1. Sensor signal do not change when the vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph).
  1. Deceleration sensor
  2. Harness or connector
  3. Skid control ECU (Master cylinder solenoid)
C1245
The following condition continues for at least 60 seconds.
  1. 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:
  1. 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.
  2. The value of GL1 is outside the range of -1.5 to 1.5 G for 1.2 seconds or more.
  3. A deceleration sensor open circuit occurs 7 times or more.
C1279
Stored during test mode.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1243 Acceleration Sensor Stuck Malfunction


INSPECTION PROCEDURE

NOTICE:
After replacing the deceleration sensor, perform zero point calibration (Click here).
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.

  1. Connect the GTS to the DLC3.

  1. Start the engine.

  1. Turn the GTS on.

  1. 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/s2 while stationary
    		The reading changes when the vehicle is bounced.

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

    OK:
    Deceleration value changes.


NG
Go to step 4
OK


3.CHECK DTC

  1. Install the deceleration sensor to the vehicle.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

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

  1. 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
Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1243 Acceleration Sensor Stuck Malfunction

  1. Remove the deceleration sensor (Click here).

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

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

  1. 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
    Text in Illustration
    *a
    		Component without harness connected
    (Deceleration Sensor)
    *b
    		Front
    *c
    		Tilted forward
    *d
    		Tilted rearward
    HINT:
    1. If the sensor is tilted too much, it may output the wrong value.
    2. If the voltage drops, the sensor should be replaced with a new one.
    3. 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.

  1. Disconnect the E88 deceleration sensor connector.

  1. 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.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

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

  1. 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)