Dtc C1243/43 Acceleration Sensor Stuck Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHOOSE DIAGNOSIS METHOD

READ VALUE USING INTELLIGENT TESTER (DECELERATION SENSOR 1)

INSPECT DECELERATION SENSOR

CHECK WIRE HARNESS (SKID CONTROL ECU - DECELERATION SENSOR)

CHECK FOR DTC

DTC C1243/43 Acceleration Sensor Stuck Malfunction

DTC C1244/44 Open or Short in Deceleration Sensor Circuit

DTC C1245/45 Acceleration Sensor Output Malfunction

DTC 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)
  1. Deceleration sensor
  2. 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
  1. Deceleration sensor
  2. 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
  1. Deceleration sensor
  2. Deceleration sensor circuit
C1279/79
Detected only during test mode
  1. Deceleration sensor
  2. Sensor installation

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System. Dtc C1243/43 Acceleration Sensor Stuck Malfunction


INSPECTION PROCEDURE

1.CHOOSE DIAGNOSIS METHOD

  1. Choose the diagnosis method.

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


B
Go to step 3
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
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System. Dtc C1243/43 Acceleration Sensor Stuck Malfunction

  1. Remove the console box and deceleration sensor.

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

    HINT:
    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
    		Sensor Position
    		Specified Condition
    1 (GL1) - Battery's negative (-) lead
    		Horizontal
    		Approx. 2.5 V
    1 (GL1) - Battery's negative (-) lead
    		Tilted forward
    		Approx. 0.5 to 2.5 V
    1 (GL1) - Battery's negative (-) lead
    		Tilted rearward
    		Approx. 2.5 to 4.5 V
    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
OK


4.CHECK WIRE HARNESS (SKID CONTROL ECU - DECELERATION SENSOR)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System. Dtc C1243/43 Acceleration Sensor Stuck Malfunction

  1. Disconnect the S2 ECU connector.

  1. Disconnect the A29 sensor connector.

  1. 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.

  1. Clear the DTCs.

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

  1. Check for DTCs.

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


B
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY