RM38T0EC _54 Brake _112606 BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS _0608077 ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for HEV Model) C

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS  ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for HEV Model)  C11781C  Multi-axis Acceleration Sensor Module "A" Circuit Voltage Out of Range  C117828  Multi-axis Acceleration Sensor Module "A" Signal Bias Level Out of Range / Zero Adjustment Failure  


DESCRIPTION

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition.

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag ECU assembly) via CAN communication.

HINT:
These DTCs may be stored if one of the following occurs:
·

Yaw rate and acceleration sensor (airbag ECU assembly) installation abnormality.

·

Yaw rate and acceleration sensor signal malfunction.



DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from Note
C11781C Multi-axis Acceleration Sensor Module "A" Circuit Voltage Out of Range
·

The value (forward and rearward G) of the acceleration sensor is less than -14.6 m/s2 or more than 14.6 m/s2 for 3 seconds or more.

·

When the vehicle is being driven and the stop light switch assembly is OFF, the value (longitudinal) of the acceleration sensor (airbag ECU assembly) is less than -4.0 m/s2 or more than 4.0 m/s2 for 20 seconds or more.

·

When the vehicle is being driven, the difference in the acceleration value (longitudinal) calculated using the speed sensors and the acceleration value of the acceleration sensor (airbag ECU assembly) is less than -3.5 m/s2 or more than 3.5 m/s2 for 4 seconds or more.

·

When the vehicle is stopped, the value (lateral) of the acceleration sensor is less than -7 m/s2 or more than 7 m/s2 for 0.4 seconds or more.


·

Acceleration sensor (airbag ECU assembly) installation

·

Acceleration sensor (airbag ECU assembly)


Does not come on Brake/EPB Output ECU: Skid control ECU (brake actuator assembly)
C117828 Multi-axis Acceleration Sensor Module "A" Signal Bias Level Out of Range / Zero Adjustment Failure
·

When the vehicle is being driven, the offset of the acceleration sensor is less than -2.25 m/s2 or more than 2.25 m/s2.

·

The value (lateral) of the acceleration sensor is less than -14.6 m/s2 or more than 14.6 m/s2 for 0.8 seconds or more.


·

Acceleration sensor (airbag ECU assembly) installation

·

Acceleration sensor (airbag ECU assembly)


Does not come on Brake/EPB Output ECU: Skid control ECU (brake actuator assembly)

PROCEDURE

1.CHECK FREEZE FRAME DATA (LATERAL G AND FORWARD AND REARWARD G)
a.

Select a DTC to display the Freeze Frame Data.


b.

Read the freeze frame data of DTC C11781C or C117828.

Chassis > Brake/EPB
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Lateral G Lateral G Min.: -25.105 m/s2, Max.: 24.908 m/s2 Turning right: -25.105 to 0.000 m/s2
Turning left: 0.000 to 24.908 m/s2 		During turning: Changes in proportion with lateral acceleration
Forward and Rearward G Forward and rearward G Min.: -25.105 m/s2, Max.: 24.908 m/s2 During deceleration: -25.105 to 0.000 m/s2
During acceleration: 0.000 to 24.908 m/s2 		During acceleration/deceleration: Changes in proportion with acceleration
Chassis > Brake/EPB > DTC(C11781C) > Freeze Frame Data
Tester Display
Lateral G
Forward and Rearward G
50040 435 25,26 C11781C
Chassis > Brake/EPB > DTC(C117828) > Freeze Frame Data
Tester Display
Lateral G
Forward and Rearward G
50040 435 25,26 C117828

Result:
Result Proceed to
The value of Lateral G or Forward and rearward G is less than -14.6 m/s2 or more than 14.6 m/s2. A
Other than above. B



A

REPLACE AIRBAG ECU ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL


B

2.CHECK FREEZE FRAME DATA (LATERAL G AND VEHICLE SPEED)
2.CHECK FREEZE FRAME DATA (LATERAL G AND VEHICLE SPEED)
a.

Select a DTC to display the Freeze Frame Data.


b.

Read the freeze frame data of DTC C11781C or C117828.

Chassis > Brake/EPB
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Lateral G Lateral G Min.: -25.105 m/s2, Max.: 24.908 m/s2 Turning right: -25.105 to 0.000 m/s2
Turning left: 0.000 to 24.908 m/s2 		During turning: Changes in proportion with lateral acceleration
Vehicle Speed Vehicle speed (vehicle speed used for each control) Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
Chassis > Brake/EPB > DTC(C11781C) > Freeze Frame Data
Tester Display
Lateral G
Vehicle Speed
50040 435 25,51 C11781C
Chassis > Brake/EPB > DTC(C117828) > Freeze Frame Data
Tester Display
Lateral G
Vehicle Speed
50040 435 25,51 C117828

Result:
Result Proceed to
The value of Vehicle speed is 0 km/h (0 mph) and the value of Lateral G is less than -7 m/s2 or more than 7 m/s2, or the value of Lateral G is less than -14.6 m/s2 or more than 14.6 m/s2. A
Other than above. B



A

REPLACE AIRBAG ECU ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL


B

3.CHECK AIRBAG ECU ASSEMBLY INSTALLATION
3.CHECK AIRBAG ECU ASSEMBLY INSTALLATION
a.

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

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>INSTALLATION

OK:

The yaw rate and acceleration sensor (airbag ECU assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag ECU assembly) is not installed in a tilted position.



Result:
Proceed to
OK
NG



OK

REPLACE AIRBAG ECU ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL


NG

INSTALL AIRBAG ECU ASSEMBLY CORRECTLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>INSTALLATION