DTC    C1234/34    Yaw Rate Sensor Malfunction

DTC    C1243/43    Acceleration Sensor Stuck Malfunction

DTC    C1244/44    Open or Short in Acceleration Sensor Circuit

DTC    C1245/45    Acceleration Sensor Output Malfunction

DTC    C1279/79    Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)

DTC    C1381/97    Acceleration Sensor Power Supply Voltage Malfunction

for Preparation Click here


DESCRIPTION

The skid control ECU receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).
If there are any problems in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTCs U0123/62 (Lost Communication with Yaw Rate Sensor Module) and U0124/95 (Lost Communication with Lateral Acceleration Sensor Module) are stored.
These DTCs are also output when calibration has not been completed.
DTC C1279/79 will be cleared when the yaw rate and acceleration sensor (airbag sensor assembly) sends a yaw rate and/or acceleration signal or when Test Mode ends. DTC C1279/79 is output only in Test Mode.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
C1234/34
711
While yaw rate sensor communication is enabled, a malfunction signal output is received during the sensor self-check (Sensor 1 (GL1) malfunction).
Yaw rate and acceleration sensor (Airbag sensor assembly) internal malfunction
↑
712
While yaw rate sensor communication is enabled, a malfunction signal output is received during the sensor self-check (Sensor 2 (GL2) malfunction).
↑
↑
713
While yaw rate sensor communication is enabled, a malfunction signal output is received during the sensor self-check (Zero point calibration malfunction).
↑
↑
714
While yaw rate sensor communication is enabled, a malfunction signal output is received during the sensor self-check (Two-value comparison malfunction).
↑
C1243/43
561
An acceleration sensor malfunction occurs 16 times or more when the vehicle speed drops from above 30 km/h (19 mph) to 0 km/h (0 mph).
Yaw rate and acceleration sensor (Airbag sensor assembly) internal stuck malfunction
↑
562
563
564
565
A stuck acceleration sensor value is determined.
↑
C1244/44
571
Either of the following is detected:
  1. Difference between GL1 and GL2 does not become less than 0.4 G for 60 seconds or more after reaching 0.6 G when the vehicle is stopped.
  2. A malfunction signal from the acceleration sensor is received.
  1. Yaw rate and acceleration sensor (Airbag sensor assembly) installed improperly
  2. Yaw rate and acceleration sensor (Airbag sensor assembly)
C1245/45
581
Difference between longitudinal G calculated from the acceleration sensor value and that calculated from the vehicle speed exceeds 0.35 G for 60 seconds or more.
  1. Yaw rate and acceleration sensor (Airbag sensor assembly) installed improperly
  2. Yaw rate and acceleration sensor (Airbag sensor assembly)
C1381/97
601
While yaw rate and acceleration sensor communication is enabled, a supply voltage malfunction signal is received from the sensor for 10 seconds.
  1. Yaw rate and acceleration sensor (Airbag sensor assembly) supply voltage shut down
  2. Yaw rate and acceleration sensor (Airbag sensor assembly)
  3. Skid control ECU (Brake booster with master cylinder assembly)
C1279/79
-
Detected only during Test Mode.
  1. Sensor installation
  2. Yaw rate and acceleration sensor (Airbag sensor assembly)

WIRING DIAGRAM


C246787E06


INSPECTION PROCEDURE

NOTICE:
When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration (Click here).

HINT:
When U0123/62 and/or U0124/95 is output together with C1234/34, C1243/43, C1244/44, C1245/45, and/or C1381/97, inspect and repair the trouble areas indicated by U0123/62 and/or U0124/95 first (Click here).
1.CHECK DTC

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON (READY).

  1. Drive the vehicle at a speed of 30 km/h (19 mph) or more, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.

  1. Turn the ignition switch to ON (IG) again and check that no CAN communication system DTC is output (Click here).

  1. Check if DTC C1210/36 (Zero Point Calibration of Yaw Rate Sensor Undone) or C1336/98 (Zero Point Calibration of Acceleration Sensor Undone) is output (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1210/36, C1336/98 and CAN communication system DTC) are not output.
    		A
    CAN communication system DTC is output.
    		B
    DTCs C1210/36 and/or C1336/98 are output.
    		C


B
INSPECT CAN COMMUNICATION SYSTEM (Click here)

C
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (Click here)
A


2.CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

  1. Turn the ignition switch off.

  1. Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly (Click here).

    OK:
    The sensor is tightened to the specified torque.
    The sensor is not tilted.


NG
INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY (Click here)
OK


3.CHECK HARNESS AND CONNECTOR (IG2 TERMINAL)


    C239271E09

  1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

  1. Disconnect the yaw rate and acceleration sensor (airbag sensor assembly) connector.

  1. Turn the ignition switch to ON (IG).

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G18-21 (IG2) - Body ground
    		Ignition switch ON (IG)
    		11 to 14 V
    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)
OK


4.CHECK HARNESS AND CONNECTOR (E TERMINAL)


    C239271E10

  1. Turn the ignition switch off.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G18-25 (E1) - Body ground
    		Always
    		Below 1 Ω
    G18-26 (E2) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

    NOTICE:
    Check the yaw rate and acceleration sensor signal after replacement (Click here).

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (E CIRCUIT)
OK

REPLACE AIRBAG SENSOR ASSEMBLY (Click here)