Dtc C1243/43 Acceleration Sensor Stuck Malfunction

Brake. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Brake Control. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (DECELERATION SENSOR)

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
While vehicle speed decreases from 30 km/h (18 mph) to 0 km/h (0 mph), condition that ECU terminal GL1 value does not change to 0.0294 G or more occurs 16 times consecutively.
  1. Deceleration sensor
  2. Deceleration sensor circuit
  3. Brake actuator (Skid control ECU)
C1244/44
When one of following conditions is met:
  1. ECU terminal GL1 value of -1.5 G or less or 1.5 G or more continues for 1.2 seconds or more.
  2. Deceleration sensor terminal VGS voltage of 4.4 V or less or 5.6 V or more continues for 1.2 seconds or more.
  3. Deceleration sensor signal momentary open occurs 7 times or more.
  1. Deceleration sensor
  2. Deceleration sensor circuit
  3. Brake actuator (Skid control ECU)
C1245/45
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.
  1. Deceleration sensor
  2. Deceleration sensor circuit
  3. Brake actuator (Skid control ECU)
C1279/79
Detected only during test mode
  1. Deceleration sensor
  2. Sensor installation

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1243/43 Acceleration Sensor Stuck Malfunction


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (DECELERATION SENSOR)

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

    Skid control ECU
    Tester Display
    		Measurement Item / Range
    		Normal Condition
    		Diagnostic Note
    Deceleration Sensor
    		Deceleration sensor reading / Min.: -18.52 m/s2, Max.: 18.39 m/s2
    		-
    		Reading changes when vehicle is shaken
    OK:
    Deceleration value changes.


NG
Go to step 2
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200OX.html)

2.INSPECT DECELERATION SENSOR


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1243/43 Acceleration Sensor Stuck Malfunction

  1. Remove the 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. 2.3 V
    1 (GL1) - Battery's negative (-) lead
    		Tilted forward
    		Approx. 0.4 to 2.3 V
    1 (GL1) - Battery's negative (-) lead
    		Tilted rearward
    		Approx. 2.3 to 4 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 (RAV4_ACA30 RM000001XVQ009X.html)
OK


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


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1243/43 Acceleration Sensor Stuck Malfunction

  1. Disconnect the A27 ECU connector.

  1. Disconnect the K7 sensor connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    A27-4 (GL1) - K7-1 (GL1)
    		Below 1 Ω
    A27-7 (GGND) - K7-2 (GGND)
    		Below 1 Ω
    A27-28 (VGS) - K7-3 (VGS)
    		Below 1 Ω
    K7-1 (GL1) - Body ground
    		10 kΩ or higher
    K7-2 (GGND) - Body ground
    		10 kΩ or higher
    K7-3 (VGS) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.CHECK FOR DTC

  1. Install the deceleration sensor to the vehicle.

  1. Clear the DTCs (RAV4_ACA30 RM000000ONJ02UX.html).

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

  1. Check for DTCs (RAV4_ACA30 RM000000ONJ02UX.html).

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


B
USE SIMULATION METHOD TO CHECK (RAV4_ACA30 RM00000135201PX.html)
A

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200OX.html)