C1234, C1243, C1244, C1245, C1279

DTC Code	DTC Name
C1234	Yaw Rate Sensor
C1243	Deceleration Sensor Stuck
C1244	Open or Short Circuit in Deceleration Sensor Circuit
C1245	Abnormal Output in Deceleration Sensor
C1279	Abnormal Output Voltage in Deceleration Sensor

DESCRIPTION

The skid control ECU assembly receives signals from the yaw rate and acceleration sensor via CAN communication.

The yaw rate and acceleration sensor detects the vehicle condition using 2 circuits (GL1, GL2).

If there are malfunctions in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, DTCs U0123 (Lost Communication With Yaw Rate Sensor Module) and U0124 (Lost Communication With Lateral Acceleration Sensor Module) will be stored.

These DTCs are also output when zero point calibration has not been completed.

DTC C1279 will be cleared when the yaw rate and acceleration sensor sends a yaw rate and/or acceleration signal or when Test Mode ends. DTC C1279 is output only in Test Mode.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1234	Yaw Rate Sensor	- 333 334 335 337	INF Code: - Either of the following is detected: Signal of malfunction that is detected at sensor self-check is received when communication with the sensors is valid. Yaw rate sensor (GL1 or GL2 circuit) open or short. INF Code: 333 While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Sensor 1 (GL1) malfunction). INF Code: 334 While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Sensor 2 (GL2) malfunction). INF Code: 335 While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Zero point calibration malfunction). INF Code: 337 While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Two-value comparison malfunction).	INF Code: - Yaw rate sensor (Yaw rate and acceleration sensor) INF Code: 333, 334, 335, 337 Yaw rate sensor (Yaw rate and acceleration sensor) internal malfunction	VSC DTC
C1243	Deceleration Sensor Stuck	311 312 317 323	INF Code: 311 A stuck acceleration sensor (GL1) value is determined. INF Code: 312 A stuck acceleration sensor (GL2) value is determined. INF Code: 317 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). INF Code: 323 The values of both GL1 and GL2 are 1.4 G or more or -1.4 G or less for 60 seconds or more.	INF Code: 311, 312 Acceleration sensor (Yaw rate and acceleration sensor) internal stuck malfunction INF Code: 317, 323 Acceleration sensor (Yaw rate and acceleration sensor) internal stuck malfunction Skid control ECU assembly	ABS DTC
C1244	Open or Short Circuit in Deceleration Sensor Circuit	314	Either of the following is detected: 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. A malfunction signal from the acceleration sensor is received.	Zero point calibration undone Acceleration sensor (Yaw rate and acceleration sensor) installed improperly Acceleration sensor (Yaw rate and acceleration sensor) Skid control ECU assembly	ABS DTC
C1245	Abnormal Output in Deceleration Sensor	313	At a vehicle speed of 30 km/h (19 mph) or more, 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.	Acceleration sensor (Yaw rate and acceleration sensor) internal malfunction	ABS DTC
C1279	Abnormal Output Voltage in Deceleration Sensor	-	Detected only during Test Mode.	Zero point calibration undone Improperly connected connector, deformation or corrosion of terminals Acceleration sensor (Yaw rate and acceleration sensor) internal stuck malfunction Acceleration sensor (Yaw rate and acceleration sensor) installed improperly	ABS Test Mode DTC

CAUTION / NOTICE / HINT

Note

When replacing the yaw rate and acceleration sensor, perform initialization and calibration of the linear solenoid valve.

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Tech Tips

When U0123 and/or U0124 is output together with C1234, C1243, C1244 and/or C1245, inspect and repair the trouble areas indicated by U0123 and/or U0124 first.

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PROCEDURE

CHECK DTC

Clear the DTCs.

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Chassis > ABS/VSC/TRC > Clear DTCs
Turn the power switch off.
Turn the power switch on (READY).
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.
Turn the power switch on (IG) again and check that no CAN communication system DTCs are output.

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Check if DTC C1210 (Zero Point Calibration of Yaw Rate Sensor undone) or C1336 (Zero Point Calibration of Deceleration Sensor undone) is output.

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Chassis > ABS/VSC/TRC > Trouble Codes

Result

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

B

INSPECT CAN COMMUNICATION SYSTEM Click here

C

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

A

CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

Turn the power switch off.

Check that the yaw rate and acceleration sensor has been installed properly.

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OK
The yaw rate and acceleration sensor is tightened to the specified torque.
The yaw rate and acceleration sensor is not tilted.

Note

Check the yaw rate and acceleration sensor signal after replacement.

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Tech Tips

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.

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Result

Proceed to
OK
NG

OK

REPLACE YAW RATE AND ACCELERATION SENSOR Click here

NG

INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY Click here

ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1234, C1243, C1244, C1245, C1279