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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1243

Acceleration Sensor Stuck Malfunction

Any of the following is detected:

  • Output values of GL1 and GL2 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 GL1 and GL2 (front and rear, left and right) are outside permitted output range for 60 seconds or more.
  • Left and right output values of GL1 and GL2 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
DTC Detection Conditions: C1243
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

-

-

-

-

Malfunction Status

Output values of GL1 and GL2 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 GL1 and GL2 (front and rear, left and right) are outside permitted output range.

-

-

Left and right output values of GL1 and GL2 are outside permitted output range.

-

-

Detection Time

-

60 seconds or more

60 seconds or more

Number of Trips

1 trip

1 trip

1 trip

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

1.

CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(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

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