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

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Acceleration Sensor Stuck Malfunction (C1232,C1243,C1245)

DESCRIPTION

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 acceleration sensor and detects the vehicle condition.

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 (malfunction in CAN communication with the acceleration sensor) is output.

These DTCs are also output when calibration has not been completed.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1232	Acceleration Sensor Stuck Malfunction	At a vehicle speed of 10 km/h (6 mph) or more, the acceleration sensor output value does not change for 30 seconds or more.	Acceleration sensor (Airbag sensor assembly) Acceleration sensor (Airbag sensor assembly) circuit Sensor installation
C1243	Acceleration Sensor Stuck Malfunction	Any of the following is detected: Output values of the acceleration sensor do not change 16 times or more while vehicle speed decreases from 30 km/h (19 mph) to 0 km/h (0 mph). Output values of the acceleration sensor are outside permitted output range for 60 seconds or more. Left and right output values of the acceleration sensor are outside permitted output range for 60 seconds or more.	Acceleration sensor (Airbag sensor assembly) Acceleration sensor (Airbag sensor assembly) circuit Sensor installation
C1245	Acceleration Sensor Output Malfunction	At a vehicle speed of 30 km/h (19 mph) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed exceeds 0.35 G for 60 seconds or more.	Acceleration sensor (Airbag sensor assembly) Acceleration sensor (Airbag sensor assembly) circuit Sensor installation

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page ).
When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration and store system information (See page ).

HINT:

When U0124 and/or U0126 is output together with C1232, C1243 and/or C1245, inspect and repair the trouble areas indicated by U0124 and/or U0126 first (See page PROCEDURE ).

PROCEDURE

CHECK DTC

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

(b) Turn the ignition switch off.

(d) At a speed of 30 km/h (19 mph) or more, drive the vehicle, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.

(e) Check that no CAN communication system DTC is output (See page (f) Check if DTCs for zero point calibration of the yaw rate sensor undone (C1210) ).

(f) Check if DTCs for zero point calibration of the yaw rate sensor undone (C1210) or for zero point calibration of the acceleration sensor undone (C1336) are output (See page Result Result ).

Result

Result	Proceed to
DTC (relating to yaw rate and acceleration sensor) is output	A
DTC (relating to CAN communication system) is output	B
DTC (C1210 and/or C1336) are output	C

CHECK CAN COMMUNICATION SYSTEM

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

2.	CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the ignition switch off.

(b) Check that the airbag sensor assembly has been installed properly (See page OK: OK: ).

OK:

The sensor should be tightened to the specified torque.

The sensor should not be tilted position.

REPLACE AIRBAG SENSOR ASSEMBLY

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

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