Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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 ).
  • 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

B

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

A

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

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

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))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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. ).

(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

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG SENSOR ASSEMBLY

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