Toyota Avalon Service & Repair Manual: Zero Point Calibration of Deceleration Sensor undone (C1336)

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 a communication error with the yaw rate and acceleration sensor (airbag sensor assembly) is detected, DTCs U0123 (Lost Communication With Yaw Rate Sensor Module) and U0151 (Lost Communication With Restraints Control Module) are stored.

The DTCs are also stored when the calibration has not been completed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1336

Zero Point Calibration of Deceleration Sensor undone

Zero point calibration of acceleration sensor undone.

  • Acceleration sensor (airbag sensor assembly) installation
  • Acceleration sensor (airbag sensor assembly)
  • Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

    Click here

  • After replacing or reinstalling the yaw rate and acceleration sensor (airbag sensor assembly), perform system variant learning and acceleration sensor zero point calibration.

    Click here

HINT:

When U0123 and/or U0151 is output together with C1336, inspect and repair the trouble areas indicated by U0123 and/or U0151 first.

Click here

PROCEDURE

1.

PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR

(a) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Test Mode.

(b) Perform zero point calibration of the yaw rate and acceleration sensor.

Click here

Chassis > ABS/VSC/TRAC/EPB > Utility

Tester Display

Test Mode

NEXT

2.

PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

(a) Turn the engine switch off.

(b) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Signal Check.

(c) Using the Techstream, perform a Test Mode (Signal Check) inspection sensor check and check that all Test Mode (Signal Check) inspection items change from incomplete to complete.

Click here

Chassis > ABS/VSC/TRAC/EPB > Utility

Tester Display

Signal Check

OK:

All Test Mode (Signal Check) inspection items change from incomplete to complete

OK

END

NG

3.

CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the engine switch off.

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

Click here

OK:

The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

OK

4.

READ VALUE USING TECHSTREAM (ACCELERATION SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Deceleration Sensor

Acceleration sensor reading

Min.: -18.525 m/s2

Max.: 18.387 m/s2

-

During deceleration/acceleration: Changes continuously

Deceleration Sensor2

Acceleration sensor 2 reading

Min.: -18.525 m/s2

Max.: 18.387 m/s2

-

During deceleration/acceleration: Changes continuously

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display

Deceleration Sensor

Deceleration Sensor2

(d) Check the yaw rate and acceleration sensor (airbag sensor assembly) output value displayed on the Techstream.

OK:

The yaw rate and acceleration sensor (airbag sensor assembly) output value is normal.

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPLACE AIRBAG SENSOR ASSEMBLY

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