Lexus ES manuals

Lexus ES: Zero Point Calibration of Yaw Rate Sensor undone (C1210,C1336)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hv Model) / 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.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1210

Zero Point Calibration of Yaw Rate Sensor undone

1139

Yaw rate sensor zero point calibration is incomplete.
  • Yaw rate sensor (airbag ECU assembly) installed improperly
  • Yaw rate sensor (airbag ECU assembly)
  • Skid control ECU (brake booster with master cylinder assembly)

Does not come on

VSC DTC

C1336

Zero Point Calibration of Deceleration Sensor undone

1138

Acceleration sensor zero point calibration is incomplete.
  • Acceleration sensor (airbag ECU assembly) installed improperly
  • Acceleration sensor (airbag ECU assembly)
  • Skid control ECU (brake booster with master cylinder assembly)

Only DTC C1336 (INF code 1138) is stored: Does not come on

SAE Code C1336 is stored: Comes on
  • INF Code 1138: SAE Code C1336
  • ABS DTC

MONITOR DESCRIPTION

SAE Code C1336:
  • 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.
C1336 (INF Code 1138):
  • 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 (No. 3 combination 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.

C1336

Related DTCs

C1336: Acceleration sensor exceeded learning limit

Required Sensors/Components(Main)

Skid control ECU (brake booster with master cylinder assembly)

Acceleration sensor (airbag ECU assembly)

Required Sensors/Components(Related)

Speed sensor

Skid control ECU (brake booster with master cylinder assembly)

Frequency of Operation

Continuous

Duration

-

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

HINT:

SAE code only.

C1336 (Case 1)

Monitor runs whenever the following DTCs are not stored

None

Both of the following conditions are met

-

Test Mode

Off

Vehicle speed

40 km/h (25 mph) or more
C1336 (Case 2)

Monitor runs whenever the following DTCs are not stored

None

Learning of zero point

Complete

TYPICAL MALFUNCTION THRESHOLDS

HINT:

SAE code only.

C1336 (Case 1)

Learning of zero point

Not complete
C1336 (Case 2)

Either of the following conditions is met

-

Acceleration sensor 1 zero point

-0.9 m/s2 or less, or 0.9 m/s2 or more

Acceleration sensor 2 zero point

-0.9 m/s2 or less, or 0.9 m/s2 or more

COMPONENT OPERATING RANGE

HINT:

SAE code only.

C1336 (Case 1 and 2)

Both of the following conditions are met

-

Acceleration sensor 1 zero point

Higher than -0.9 m/s2 to less than 0.9 m/s2

Acceleration sensor 2 zero point

Higher than -0.9 m/s2 to less than 0.9 m/s2

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

1.

PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR

(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.

Chassis > ABS/VSC/TRAC > Utility

Tester Display

Reset Memory
Chassis > ABS/VSC/TRAC > Utility

Tester Display

Test Mode
NEXT

2.

PERFORM TEST MODE (SIGNAL CHECK)

(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

Chassis > ABS/VSC/TRAC > Utility

Tester Display

Signal Check

OK:

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

OK

END
NG

3.

CHECK AIRBAG ECU ASSEMBLY INSTALLATION

(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

4.

READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION SENSOR)

(a) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Deceleration Sensor

Acceleration sensor 1

Min.: -18.525 m/s2, Max.: 18.387 m/s2

-

During deceleration/acceleration: Changes continuously

Deceleration Sensor2

Acceleration sensor 2

Min.: -18.525 m/s2, Max.: 18.387 m/s2

-

During deceleration/acceleration: Changes continuously

Yaw Rate Sensor

Yaw rate sensor 1

Min.: -128 degrees/s, Max.: 127 degrees/s

Vehicle stationary: 0 degrees/s

Turning right: -128 to 0 degrees/s

Turning left: 0 to 127 degrees/s

-

Yaw Rate Sensor2

Yaw rate sensor 2

Min.: -128 degrees/s, Max.: 127 degrees/s

Vehicle stationary: 0 degrees/s

Turning right: -128 to 0 degrees/s

Turning left: 0 to 127 degrees/s

-
Chassis > ABS/VSC/TRAC > Data List

Tester Display

Deceleration Sensor

Deceleration Sensor2

Yaw Rate Sensor

Yaw Rate Sensor2

(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

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