Toyota Tacoma (2015-2018) Service Manual: Acceleration Sensor Power Supply Voltage Malfunction (C1381)

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Acceleration Sensor Power Supply Voltage Malfunction (C1381)

DESCRIPTION

The skid control ECU (master cylinder solenoid) receives signals from the yaw rate and acceleration (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, DTCs U0123 (yaw rate sensor communication trouble) and U0124 (acceleration sensor communication trouble) are stored.

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.	ECU-IG fuse Yaw rate and acceleration sensor (airbag sensor assembly)

WIRING DIAGRAM

Refer to DTCs C1232, C1243 and C1245 (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform calibration (See page ).
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs (See page Result ).

Result

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

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

2.	CHECK HARNESS AND CONNECTOR (IG2, E1, E2 TERMINAL)

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

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A21-21 (IG2) - Body ground	Ignition switch ON	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
A21-25 (E1) - Body ground	Always	Below 1 Ω
A21-26 (E2) - Body ground	Always	Below 1 Ω

Text in Illustration

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	RECONFIRM DTC

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

(b) Clear the DTCs (See page (c) Start the engine. ).

(d) Perform a road test.

(e) Check if the same DTC is output (See page Result ).

Result

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

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG SENSOR ASSEMBLY

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