Toyota CH-R Service Manual: Acceleration Sensor Stuck Malfunction (C1243,C1245)

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.

HINT:

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

CAUTION / NOTICE / HINT

NOTICE:

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

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HINT:

When U0073, U0123 and/or U0126 is output together with, C1243 and/or C1245, inspect and repair the trouble areas indicated by U0073, U0123 and/or U0126 first.

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PROCEDURE

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

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OK:

The airbag sensor assembly is tightened to the specified torque.

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

NOTICE:

Check the yaw rate and acceleration sensor signal after replacement.

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HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

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OK

REPLACE AIRBAG SENSOR ASSEMBLY

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY