Lexus ES manuals

Lexus ES: Yaw Rate Sensor discrimination (C1240)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hv Model) / Yaw Rate Sensor discrimination (C1240)

DESCRIPTION

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

If the identification ID of the yaw rate and acceleration sensor (airbag ECU assembly) is different to that stored in the skid control ECU (brake booster with master cylinder assembly), DTC C1240 is stored.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1240

Yaw Rate Sensor discrimination

406

The identification ID sent from the yaw rate sensor is different to that stored in the skid control ECU (brake booster with master cylinder assembly) for 1 second or more.
  • Incorrect yaw rate sensor (airbag ECU assembly) installed
  • Skid control ECU (brake booster with master cylinder assembly)

Comes on
  • INF Code 406: SAE Code C1240
  • VSC DTC

MONITOR DESCRIPTION

When an incompatible yaw rate and acceleration sensor (airbag ECU assembly) is installed and the skid control ECU (brake booster with master cylinder assembly) receives a signal differing from the yaw rate and acceleration sensor that should be installed, the skid control ECU (brake booster with master cylinder assembly) judges that the signal is abnormal and illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C1240: Yaw rate and acceleration sensor incorrect

Required Sensors/Components(Main)

Yaw rate and acceleration sensor (airbag ECU assembly)

Required Sensors/Components(Related)

Skid control ECU (brake booster with master cylinder assembly)

Frequency of Operation

Continuous

Duration

1 second

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

Yaw rate and acceleration sensor ID (CAN communication data)

Not "4"

COMPONENT OPERATING RANGE

Yaw rate and acceleration sensor ID (CAN communication data)

"4"

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. Wait 1 second.
  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

PROCEDURE

1.

CHECK PART NUMBER (AIRBAG ECU ASSEMBLY)

(a) Check that the proper yaw rate and acceleration sensor (airbag ECU assembly) is installed.

OK:

Proper yaw rate and acceleration sensor (airbag ECU assembly) is installed.

NG

REPLACE AIRBAG ECU ASSEMBLY

OK

2.

RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(c) Turn the power switch on (IG).

(d) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Proceed to

DTC C1240 is output.

A

DTC C1240 is not output.

B
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

B

USE SIMULATION METHOD TO CHECK

READ NEXT:

 Low or High Power Supply Voltage (C1241)

DESCRIPTION If a malfunction is detected in the power supply circuit, the skid control ECU (brake booster with master cylinder assembly) power source voltage drops, or there is insufficient voltage to

 Low or High Power Supply Voltage (C1241)

DESCRIPTION If a malfunction is detected in the power supply circuit, the skid control ECU (brake booster with master cylinder assembly) power source voltage drops, or there is insufficient voltage to

 Open Circuit in IG1/IG2 Power Source Circuit (C1242)

DESCRIPTION Refer to DTC C1241. Click here DTC No. Detection Item INF Code DTC Detection Condition Trouble Area MIL Note C1242 Open Circuit in IG1/IG2 Power Source Circuit 11

SEE MORE:

 Replacement

REPLACEMENT PROCEDURE 1. REMOVE FRONT WHEEL OPENING EXTENSION PAD RH Click here 2. REMOVE FRONT WHEEL OPENING EXTENSION PAD LH Click here 3. REMOVE NO. 1 ENGINE UNDER COVER Click here 4. REMOVE NO. 2 ENGINE UNDER COVER ASSEMBLY Click here 5. REPLACE HYBRID TRANSAXLE FLUID Click here

 System Diagram

SYSTEM DIAGRAM ELECTRICAL REMOTE CONTROL MIRROR FUNCTION MIRROR HEATER FUNCTION AUTOMATIC GLARE-RESISTANT EC MIRROR FUNCTION Communication Table Sender Receiver Signal Communication Method Air Conditioning Control Assembly Air Conditioning Amplifier Assembly Mirror heater switch

© 2016-2024 Copyright www.lexguide.net