Toyota Tundra Service Manual: Acceleration Sensor Stuck Malfunction (C1243)

DESCRIPTION

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

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 U0123 (Lost Communication with Yaw Rate Sensor Module) is output.

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1243

Acceleration Sensor Stuck Malfunction

Any of the following is detected:

  • When the vehicle speed is over 70 km/h and the acceleration sensor value is 0.0 G.
  • When both the acceleration sensor value and the calculated absolute value of the acceleration sensor exceed 0.2 G at a vehicle speed of 70 km/h or more.
  • Acceleration sensor (airbag sensor assembly)
  • Acceleration sensor (airbag sensor assembly) circuit
  • Sensor installation

CAUTION / NOTICE / HINT

NOTICE:

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

Click here

HINT:

When U0073, U0123 and/or U0126 is output together with C1243, inspect and repair the trouble areas indicated by U0073, U0123 and/or U0126 first.

Click here

PROCEDURE

1.

CHECK BRAKE ACTUATOR ASSEMBLY

(a) Check if the brake actuator assembly had been replaced before the DTC was recorded.

Result

Proceed to

The brake actuator assembly is not replaced

A

The brake actuator assembly is replaced

B

B

GO TO STEP 3

A

2.

CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

for Column Shift Type: Click here

for Floor Shift Type: Click here

OK:

The airbag sensor assembly is tightened to the specified torque.

The airbag sensor assembly is not installed in a tilted position.

OK

REPLACE AIRBAG SENSOR ASSEMBLY

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

3.

PERFORM ACCELERATION SENSOR ZERO POINT CALIBRATION

(a) Perform acceleration sensor zero point calibration.

Click here

NEXT

4.

RECONFIRM DTC

(a) Clear the DTC.

Click here

(b) Check if the same DTC is recorded.

Click here

Result

Proceed to

DTC C1243 is not output

A

DTC C1243 is output

B

A

END

B

REPLACE BRAKE ACTUATOR ASSEMBLY

    Low Power Supply Voltage Malfunction (C1241)

    Master Cylinder Pressure Sensor Malfunction (C1246)

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