BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS  VEHICLE STABILITY CONTROL SYSTEM  C1381  Acceleration Sensor Power Supply Voltage Malfunction  


DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) receives a sensor supply voltage malfunction signal from the yaw rate and acceleration sensor (airbag ECU assembly).

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1381 Acceleration Sensor Power Supply Voltage Malfunction At a vehicle speed of more than 3 km/h (2 mph), an acceleration sensor power source malfunction signal is received for 10 seconds or more.
·

Acceleration sensor power source circuit

·

Acceleration sensor (airbag ECU assembly)



WIRING DIAGRAM

C270520E84
0.813,0.719 1.427,0.917 0.615,0.198 10 false CANL 6.052,0.708 6.667,0.906 0.615,0.198 10 false CANL 0.802,1.333 1.417,1.531 0.615,0.198 10 false CANH 6.052,1.333 6.667,1.531 0.615,0.198 10 false CANH 0.958,1.938 1.417,2.135 0.458,0.198 10 false IG2 2.25,2.094 2.781,2.313 0.531,0.219 10 false A/BAG 3.927,1.927 4.917,2.135 0.99,0.208 10 false from IG2 Relay 1,2.552 1.313,2.75 0.313,0.198 10 false E1 1,3.167 1.313,3.365 0.313,0.198 10 false E2 0.083,4.073 2.229,4.479 2.146,0.406 10 false Yaw Rate and Acceleration Sensor (Airbag ECU Assembly) 0.094,3.927 0.552,4.125 0.458,0.198 10 false E14 3.49,3.125 5.49,3.375 2,0.25 10 false : CAN Communication Line 5.531,4.083 7.073,4.469 1.542,0.385 10 false Skid Control ECU (Brake Actuator Assembly) 5.542,3.917 6,4.115 0.458,0.198 10 false A64 5.781,0.542 6.094,0.74 0.313,0.198 10 false 14 5.792,1.167 6.104,1.365 0.313,0.198 10 false 25 1.281,0.542 1.594,0.74 0.313,0.198 10 false 22 1.271,1.167 1.583,1.365 0.313,0.198 10 false 13 1.281,1.833 1.594,2.031 0.313,0.198 10 false 21 1.281,2.448 1.594,2.646 0.313,0.198 10 false 25 1.281,3.063 1.594,3.26 0.313,0.198 10 false 26 2.188,1.844 2.344,2.042 0.156,0.198 10 false 2 2.667,1.844 2.823,2.042 0.156,0.198 10 false 1

CAUTION / NOTICE / HINT

NOTICE:
·

When replacing the yaw rate and acceleration sensor (airbag ECU assembly), perform zero point calibration.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>CALIBRATION

·

When replacing the yaw rate and acceleration sensor (airbag ECU assembly), perform deceleration sensor zero point calibration and CVT oil pressure calibration.

Click hereDrivetrain>K313 CVT>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>INITIALIZATION

·

Inspect the fuses for circuits related to this system before performing the following procedure.



PROCEDURE

1.CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)
a.
C239271C14
0.25,0.708 0.729,1 0.479,0.292 1.031,2.188 0.573,2.792 false 0.385,0.781 0.729,1.198 0.344,0.417 10 E14 0.24,0.219 0.573,0.615 0.333,0.396 10 *a 0.385,2.823 0.677,3 0.292,0.177 10 IG2
*a Front view of wire harness connector
(to Yaw Rate and Acceleration Sensor (Airbag ECU Assembly))


Make sure that there is no looseness at the locking part and the connecting part of the connector.


b.

Disconnect the E14 yaw rate and acceleration sensor (airbag ECU assembly) connector.


c.

Turn the engine switch on (IG).


d.

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

Standard Voltage:
Tester Connection Condition Specified Condition
E14-21 (IG2) - Body ground Engine switch on (IG) 11 to 14 V



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

2.CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)
a.
C239271C15
0.25,0.708 0.729,1 0.479,0.292 1.635,2.188 1.198,2.813 false 1.802,2.188 2.271,2.813 false 0.385,0.771 0.844,1.031 0.458,0.26 10 E14 0.24,0.219 0.458,0.396 0.219,0.177 10 *a 1.052,2.844 1.281,3.021 0.229,0.177 10 E1 2.208,2.844 2.438,3.021 0.229,0.177 10 E2
*a Front view of wire harness connector
(to Yaw Rate and Acceleration Sensor (Airbag ECU Assembly))


Turn the engine switch off.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
E14-25 (E1) - Body ground Always Below 1 Ω
E14-26 (E2) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

3.RECONFIRM DTC

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

3.RECONFIRM DTC
a.

Reconnect the E14 yaw rate and acceleration sensor (airbag ECU assembly) connector.


b.

Clear the DTCs.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>DTC CHECK / CLEAR

Chassis > ABS/VSC/TRC > Clear DTCs
50002 105

c.

Turn the engine switch off.


d.

Start the engine.


e.

Perform a road test.


f.

Check if the same DTC is output.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>DTC CHECK / CLEAR

Chassis > ABS/VSC/TRC > Trouble Codes
50001 105
Result:
Result Proceed to
DTC C1381 is not output. A
DTC C1381 is output. B


NOTICE:

Check the yaw rate and acceleration sensor signal after replacement.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>TEST MODE PROCEDURE


HINT:

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

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>PROBLEM SYMPTOMS TABLE




A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

REPLACE AIRBAG ECU ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL