DTC    C1234/34    Yaw Rate Sensor Malfunction

DTC    C0371/71    Yaw Rate Sensor (Test Mode 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    Deceleration Sensor Output Voltage Malfunction (Test Mode DTC)

DTC    C1381/97    Yaw Rate and / or Acceleration Sensor Power Supply Voltage Malfunction

for Preparation Click here


DESCRIPTION

The skid control ECU receives signals from the yaw rate and acceleration sensor via the CAN communication system.
The yaw rate sensor has a built-in acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).
If there is trouble in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, the DTC U0123/62 (malfunction in CAN communication with yaw rate sensor) and U0124/95 (malfunction in CAN communication with acceleration sensor) are output.
These DTCs are also output when the calibration has not been completed.
DTCs C0371/71 and C1279/79 can be deleted when the yaw rate and acceleration sensor sends a yaw rate and/or acceleration signal or the Test Mode ends. DTCs C0371/71 and C1279/79 are output only in the Test Mode.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
C1234/34
331
332
Signal of malfunction that is detected at sensor self-check is received when communication with the sensors is valid.
Yaw rate and acceleration sensor
↑
333
Yaw rate sensor malfunction (GL1 circuit).
↑
↑
334
Yaw rate sensor malfunction (GL2 circuit).
↑
↑
335
Yaw rate sensor zero point malfunction.
↑
↑
337
2 yaw rate sensor (GL1, GL2) malfunctions.
↑
C1243/43
311
312
317
Sensor sticking can be seen 16 times or more in a series at a speed between 18 mph (30 km/h) or more and 0 mph (0km/h).
  1. Yaw rate and acceleration sensor
  2. Skid control ECU
C1244/44
314
When either of the following conditions is detected:
  1. Both of the following conditions continue for at least 60 seconds.
    1. Vehicle is stopped.
    2. Difference between GL1 and GL2 does not drop below 0.4 G once it reaches 0.6 G or more.
  2. Data malfunction signal is received from acceleration sensor.
  1. Zero point calibration undone
  2. Sensor installation
  3. Yaw rate and acceleration sensor
  4. Skid control ECU
C1245/45
313
When the following condition continues for at least 60 seconds:
  1. At a vehicle speed of 19 mph (30 km/h) or more, the difference between the forward and backward G calculated from the G sensor and that calculated from the vehicle speed sensors exceeds 0.35 G.
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor circuit
  3. Skid control ECU
C1381/97
315
Acceleration sensor power source malfunction signal is received for at least 10 seconds at a speed of more than 2 mph (3 km/h).
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor power source circuit
  3. Skid control ECU

WIRING DIAGRAM


C109389E01


INSPECTION PROCEDURE

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

HINT:
When U0123/62, U0124/95 or U0126/63 is output together with C1234/34, C1243/43, C1244/44, C1245/45 or C1381/97, inspect and repair the trouble areas indicated by U0123/62, U0124/95 or U0126/63 first.

1.CHECK DTC

  1. Clear the DTC (Click here).

  1. Turn the engine switch off.

  1. At a speed of 18 mph (30 km/h) or more, drive the vehicle, turn the steering wheel, and accelerate (depress the brake pedal).

  1. Turn the engine switch on (IG) again and check that no CAN communication system DTC is output.

  1. Check that no DTCs for zero point calibration of the yaw rate sensor undone (C1210/36) and for zero point calibration of the acceleration sensor undone (C1336/98) are output.

    Result:

    Condition
    		Proceed To
    DTCs (C1210/36, C1336/98, and CAN communication system malfunction) are not output.
    		A
    CAN communication system DTC is output.
    		B (Click here)
    C1210/36 and C1336/98 are output.
    		C (Click here)



B
REPAIR CAN COMMUNICATION SYSTEM ACCORDING TO OUTPUT CODE

C
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A


2.CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

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

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



NG
INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY
OK


3.INSPECT YAW RATE AND ACCELERATION SENSOR (IG TERMINAL)


    G026359E12

  1. Disconnect the yaw rate and acceleration sensor connector.

  1. Turn the engine switch on (IG).

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

    Voltage:
    Tester Connection
    		Specified Condition
    L35-5 (IG) - Body ground
    		10 to 14 V



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


4.INSPECT YAW RATE AND ACCELERATION SENSOR (GND TERMINAL)


    G026359E13

  1. Disconnect the yaw rate and acceleration sensor connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    L35-1 (GND) - Body ground
    		Below 1 Ω

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

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



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

REPLACE YAW RATE AND ACCELERATION SENSOR