Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Acceleration Sensor Stuck Malfunction (C1232,C1243,C1245,C1279)

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

C1232

At vehicle speed of 10 km/h (6 mph) or more, signal from either GL1 or GL2 does not change for 30 seconds or more.

  • A/BAG fuse
  • Sensor installation
  • Harness or connector
  • Yaw rate and acceleration sensor (airbag sensor assembly)
  • CAN communication system

C1243

Following condition repeats 16 times.

  • GL1 and GL2 do not change by more than 2LSB when vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph).

C1245

Following condition continues for at least 60 seconds.

  • Difference between values calculated from acceleration sensor value and vehicle speed exceeds 0.35 G.

C1279

Detected only during test mode

  • A/BAG fuse
  • Sensor installation
  • Harness or connector
  • Yaw rate and acceleration sensor (airbag sensor assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

When U0073, U0100, U0123, U0124 or U0126 are output together with C1232 or C1234, inspect and repair the trouble areas indicated by U0073, U0100, U0123, U0124 or U0126 first.

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs (See page ). (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(c) Check if DTCs U0073, U0123, C1210 and/or C1336 are output (See page Result Result ).

Result

Result

Proceed to

DTC U0073, U0123, C1210 and/or C1336 are not output

A

DTC U0073 and/or U0123 are output

B

DTC C1210 and/or C1336 are output

C

B

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

C

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

2.

CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Check that the yaw rate and acceleration sensor (airbag sensor assembly) is installed properly (See page ). OK: ).

OK:

The sensor is tightened to the specified torque.

The sensor is not tilted.

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

OK

3.

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))

Result

Result

Proceed to

OK (When troubleshooting in accordance with Diagnostic Trouble Code Chart)

A

OK (When troubleshooting in accordance with Problem Symptoms Table)

B

NG

C

A

REPLACE AIRBAG SENSOR ASSEMBLY

B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

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