VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1381

DTC Code	DTC Name
C1381	Acceleration Sensor Power Supply Voltage Malfunction

DESCRIPTION

for Optitron Meter Type:

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.

The airbag sensor assembly has a built-in yaw rate and 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 (airbag sensor assembly) and the CAN communication system, the DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) is output.

The DTCs are also output when the calibration has not been completed.

for TFT Meter Type:

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor via the CAN communication system.

If there is trouble in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, the DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) is output.

The DTCs are also output when the calibration has not been completed.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
C1381	Acceleration Sensor Power Supply Voltage Malfunction	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.	Acceleration sensor (airbag sensor assembly) (for optitron meter type) Acceleration sensor (yaw rate and acceleration sensor) (for TFT meter type) Wire harness or connector Backup boost converter circuit (w/ stop and start system)	-

WIRING DIAGRAM

Figure 1. for Optitron Meter Type:


*a	from IG Circuit
*b	CAN Communication Line
*c	Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly)
*d	Skid Control ECU (Brake Actuator Assembly)

Figure 2. for TFT Meter Type:

CAUTION / NOTICE / HINT

Note

When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration and store system information (for optitron meter type).

When replacing the yaw rate and acceleration sensor, perform zero point calibration and store system information (for TFT meter type).

Click here
Inspect the fuses for circuits related to this system before performing the following procedure (w/o Stop and Start System).

PROCEDURE

CHECK VEHICLE

Check the combination meter assembly.

Click here

Result

Result	Proceed to
for optitron meter type	A
for TFT meter type	B

CHECK TERMINAL VOLTAGE (IG2 TERMINAL) Click here

CHECK TERMINAL VOLTAGE (IG2 TERMINAL)

Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Make sure that there is no looseness at the locking part and the connecting part of the connector.
*a
Front view of wire harness connector

(to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

Disconnect the J20 yaw rate and acceleration sensor (airbag sensor assembly) connector.
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
Turn the engine switch on (IG).
Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
J20-21 (IG2) - Body ground	Engine switch on (IG)	8 to 16 V

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

Turn the engine switch off.

*a	Front view of wire harness connector (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

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

Standard Resistance

Tester Connection	Condition	Specified Condition
J20-25 (E1) - Body ground	Always	Below 1 Ω
J20-26 (E2) - Body ground	Always	Below 1 Ω

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

RECONFIRM DTC

Reconnect the J20 yaw rate and acceleration sensor (airbag sensor assembly) connector.
Clear the DTC.

Click here

Chassis > ABS/VSC/TRC/EPB > Clear DTCs
Turn the engine switch off.
Start the engine.
Perform a road test.

Check if the same DTC is recorded.

Click here

Chassis > ABS/VSC/TRC/EPB > Trouble Codes

Result

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

Tech Tips

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.

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USE SIMULATION METHOD TO CHECK Click here

REPLACE AIRBAG SENSOR ASSEMBLY Click here

CHECK TERMINAL VOLTAGE (IG2 TERMINAL)

Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Make sure that there is no looseness at the locking part and the connecting part of the connector.
*a
Front view of wire harness connector

(to Yaw Rate and Acceleration Sensor)

Disconnect the J19 yaw rate and acceleration sensor connector.
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
Turn the engine switch on (IG).
Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
J19-4 (IG) - Body ground	Engine switch on (IG)	8 to 16 V

Result

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

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)

INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) Click here

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

Turn the engine switch off.

*a	Front view of wire harness connector (to Yaw Rate and Acceleration Sensor)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
J19-1 (GND) - Body ground	Always	Below 1 Ω

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)

RECONFIRM DTC

Reconnect the J19 yaw rate and acceleration sensor connector.
Clear the DTC.

Click here

Chassis > ABS/VSC/TRC/EPB > Clear DTCs
Turn the engine switch off.
Start the engine.
Perform a road test.

Check if the same DTC is recorded.

Click here

Chassis > ABS/VSC/TRC/EPB > Trouble Codes

Result

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

Tech Tips

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 here

USE SIMULATION METHOD TO CHECK Click here

REPLACE YAW RATE AND ACCELERATION SENSOR Click here