Diagnostic code C0371 C1234 C1243 C1244 C1245 C1279 C1381 Lexus IS250 IS220D

Description

Wiring diagram

Inspection procedure

CHECK DTC

CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

INSPECT YAW RATE AND ACCELERATION SENSOR (IG TERMINAL)

INSPECT YAW RATE AND ACCELERATION SENSOR (GND TERMINAL)

DTC C0371/71 Yaw Rate Sensor (Test Mode DTC)

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 Yaw Rate and / or Acceleration Sensor Power Supply Voltage Malfunction

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 DTCs U0123/62 (malfunction in CAN communication with the yaw rate sensor) and U0124/95 (malfunction in CAN communication with the 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. DTC Detection Condition Trouble Area
C1234/34 Sensor malfunction signal is received from the yaw rate sensor.
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor circuit
C1243/43 While the vehicle speed changes from 19 mph (30 km/h) to 0 mph (0 km/h), the condition that the values of GL1 and GL2 do not change occurs 16 times or more.
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor circuit
C1244/44 When either of the following is detected:
  1. A data malfunction signal is received from the acceleration sensor.
  2. After the difference between GL1 and GL2 becomes 0.6 G or more with the vehicle stationary, the difference remains 0.4 G or more for 60 seconds or more.
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor circuit
C1245/45 At a vehicle speed of 19 mph (30 km/h) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed sensor exceeds 0.35 G for 60 seconds or more.
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor circuit
C1381/97 At a vehicle speed of more than 2 mph (3 km/h), the acceleration sensor power source malfunction signal is received for 10 seconds or more.
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor power source circuit

Wiring diagram

Wiring diagram. Diagnostic code C0371 C1234 C1243 C1244 C1245 C1279 C1381 Lexus IS250 IS220D

Inspection procedure

NOTICE:

When replacing the yaw rate and acceleration sensor, perform zero point calibration .

HINT:

When U0123/62, U0124/95 or U0126/63 is output together with C1232/32, 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 .

  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 decelerate (depress the brake pedal).

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

  1. Check if DTCs for zero point calibration of the yaw rate sensor undone (C1210/36) or for zero point calibration of the acceleration sensor undone (C1336/98) are output.

Result:

Condition Proceed to
DTCs (C1210/36, C1336/98, and/or 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
 
  C  
REPAIR CIRCUIT INDICATED BY OUTPUT DTC
 
A  
   

2.CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

  1. Turn the engine switch off.

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

    OK:

    The sensor is tightened 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)

Disconnect the yaw rate and acceleration sensor connector. Diagnostic code C0371 C1234 C1243 C1244 C1245 C1279 C1381 Lexus IS250 IS220D

  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.

Standard voltage:

Tester Connection Condition Specified Condition
J41-5 (IG) - Body ground Engine switch on (IG) 10 to 14 V
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT)
 
OK  
   

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

Turn the engine switch off. Diagnostic code C0371 C1234 C1243 C1244 C1245 C1279 C1381 Lexus IS250 IS220D

  1. Turn the engine switch off.

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

Standard resistance:

Tester Connection Condition Specified Condition
J41-1 (GND) - Body ground Always Below 1 ?

NOTICE:

Check the yaw rate and acceleration sensor signal after replacement .

HINT:

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

  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
 
OK  
   
REPLACE YAW RATE AND ACCELERATION SENSOR