Dtc C1381 Acceleration Sensor Power Supply Voltage Malfunction

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK TERMINAL VOLTAGE (IG2 TERMINAL)

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

RECONFIRM DTC

DTC C1381 Acceleration Sensor Power Supply Voltage Malfunction


DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and deceleration sensor (airbag sensor assembly) via the CAN communication system.
The yaw rate and deceleration sensor (airbag sensor assembly) has a built-in deceleration 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 deceleration sensor (airbag sensor assembly) and the CAN communication system, the DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) is output.
These DTCs are also output when calibration has not been completed.

DTC No.
DTC Detection Condition
Trouble Area
C1381
At a vehicle speed of more than 3 km/h (2 mph), the acceleration sensor power source malfunction signal is received for 10 seconds or more.
  1. Yaw rate and deceleration sensor (Airbag sensor assembly))
  2. Yaw rate and deceleration sensor (Airbag sensor assembly) power source circuit

WIRING DIAGRAM

Refer to DTCs C1232, C1243, C1245 and C1473 (YARIS_NCP93 RM000001RFV0BJX_02.html).

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR078X.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK TERMINAL VOLTAGE (IG2 TERMINAL)


    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1381 Acceleration Sensor Power Supply Voltage Malfunction

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

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D112-21 (IG2) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Yaw Rate and Deceleration Sensor (Airbag Sensor Assembly))

  1. Turn the ignition switch off.



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


2.CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1381 Acceleration Sensor Power Supply Voltage Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D112-25 (E1) - Body ground
    		Always
    		Below 1 Ω
    D112-26 (E2) - Body ground
    		Always
    		Below 1 Ω
    NOTICE:
    Check the yaw rate and deceleration sensor (airbag sensor assembly) signal after replacement (YARIS_NCP93 RM000000XHT098X.html).
    HINT:
    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0BRX.html).
Text in Illustration
*a
Front view of wire harness connector
(to Yaw Rate and Deceleration Sensor (Airbag Sensor Assembly))

  1. Reconnect the yaw rate and deceleration sensor (airbag sensor assembly) connector.



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


3.RECONFIRM DTC

  1. Clear the DTC (YARIS_NCP93 RM000000XHV0CQX.html).

  1. Start the engine.

  1. Perform a road test.

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0CQX.html).

Result
Result
Proceed to
DTC C1381 is not output
A
DTC C1381 is output
B


B
REPLACE YAW RATE AND DECELERATION SENSOR (AIRBAG SENSOR ASSEMBLY) (YARIS_NCP93 RM000000V6U02AX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS0ANX.html)