Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Zero Point Calibration of Yaw Rate Sensor undone (C1210,C1336)

DESCRIPTION

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

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

HINT:

If there are malfunctions in the bus lines between the yaw rate and acceleration sensor (airbag ECU assembly) and the CAN communication system, DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) will be stored.

If a DTC related to the CAN communication line is output, first troubleshoot the CAN communication line.

These DTCs (C1210 and C1336) will also be stored when zero point calibration has not been completed.

MONITOR DESCRIPTION

• The skid control ECU (brake booster with master cylinder assembly) monitors the acceleration sensor zero point calibration for successful completion. When the vehicle is being driven, if the acceleration sensor 1 or acceleration sensor 2 zero point range is outside the normal range, the skid control ECU (brake booster with master cylinder assembly) judges that the acceleration sensor zero point calibration is abnormal and illuminates the MIL and stores this DTC.

• The skid control ECU (brake booster with master cylinder assembly) monitors the acceleration sensor zero point calibration for successful completion. If the acceleration sensor 1 or acceleration sensor 2 zero point range is outside the normal range, the skid control ECU (brake booster with master cylinder assembly) judges that the acceleration zero point calibration is abnormal and illuminates the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights, blinks* the brake hold operated indicator light and stores this DTC.

  HINT:

  • *: The brake hold switch (electric parking brake switch assembly) is turned on under the following vehicle conditions.
    • Vehicle Conditions:
      1. The driver side door is closed.
      2. The driver side seat belt is fastened.
  • As the detection conditions slightly differ from SAE code C1336, the detection conditions for DTC C1336 (INF code 1138) is also provided.

MONITOR STRATEGY

HINT:

SAE code only.

TYPICAL ENABLING CONDITIONS

HINT:

SAE code only.

TYPICAL MALFUNCTION THRESHOLDS

HINT:

SAE code only.

COMPONENT OPERATING RANGE

HINT:

SAE code only.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the power switch off.
6. Turn the power switch on (IG).
7. Turn the Techstream on.
8. Enter Test Mode.

   Click here

9. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
10. Read the DTCs.

    HINT:

    • If a DTC is output, the system is malfunctioning.
    • If a DTC is not output, perform the following procedure.
11. If the DTCs are not output, perform a universal trip and check for permanent DTCs.

    Click here

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTCs are output, the system is normal.

CAUTION / NOTICE / HINT

NOTICE:

• After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

  Click here

• After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

  Click here

HINT:

When U0124 is output together with C1210 and/or C1336, inspect and repair trouble areas indicated by U0124 first.

Click here

PROCEDURE

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

Click here

NOTICE:

Make sure to perform linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization after performing "Reset Memory" as the data stored during linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization is cleared.

NEXT

(a) 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

OK:

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

OK

END

NG

(a) Turn the power switch off.

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

Click here

OK:

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

The yaw rate and acceleration sensor (airbag ECU assembly) is not tilted.

NG

INSTALL AIRBAG ECU ASSEMBLY CORRECTLY

OK

(a) Select the Data List on the Techstream.

Click here

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

OK:

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

OK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

NG

REPLACE AIRBAG ECU ASSEMBLY