DTC    C1381    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 DTCs U0123 (malfunction in CAN communication with the yaw rate sensor) and U0124 (malfunction in CAN communication with the acceleration sensor) are output.
These DTCs are also output when calibration has not been completed.

DTC Code
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 acceleration sensor
  2. Yaw rate and acceleration sensor power source circuit

WIRING DIAGRAM

Refer to DTCs C1232, C1243 and C1245 (Click here).

INSPECTION PROCEDURE

NOTICE:
When replacing the yaw rate and deceleration sensor, perform the following procedures:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
For the VSC system, clear and then reobtain the zero point calibration (Click here).
For the CVT system, perform "Reset Memory", "Deceleration Sensor zero Point Calibration", and "CVT Oil Pressure Calibration" (for K41A Click here, for K41B Click here).

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


    C156491E30

  1. Disconnect the yaw rate and acceleration sensor connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Yaw Rate and Acceleration Sensor)

  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
    D58-4 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V

    Result 
    Result
    		Proceed to
    OK
    		A
    NG (w/ Stop and Start System)
    		B
    NG (w/o Stop and Start System)
    		C



B
GO TO STOP AND START SYSTEM (Click here)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT)
A


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


    C156491E31

  1. Turn the ignition switch off.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Yaw Rate and Acceleration Sensor)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D58-1 (GND) - Body ground
    		Always
    		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


3.RECONFIRM DTC

  1. Reconnect the yaw rate and acceleration sensor connector.

  1. Clear the DTC (Click here).

  1. Start the engine.

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

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


NG
REPLACE YAW RATE AND ACCELERATION SENSOR (Click here)
OK

CHECK FOR INTERMITTENT PROBLEMS (Click here)