Lexus NX manuals

Lexus NX: Yaw Rate Sensor (C1234,C1243-C1245,C1279)

Lexus NX Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System / Yaw Rate Sensor (C1234,C1243-C1245,C1279)

DESCRIPTION

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.

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

If there are malfunctions in the bus lines between the yaw rate and acceleration sensor (airbag ECU assembly) and the CAN communication system, DTCs U0123 (Lost Communication With Yaw Rate Sensor Module) and U0124 (Lost Communication With Lateral Acceleration Sensor Module) will be stored.

These DTCs are also output when zero point calibration has not been completed.

DTC C1279 will be cleared when the yaw rate and acceleration sensor (airbag ECU assembly) sends a yaw rate and/or acceleration signal or when Test Mode ends. DTC C1279 is output only in Test Mode.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1234

Yaw Rate Sensor

711

712

713

714
  • INF Code: 711
    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Sensor 1 (GL1) malfunction).
  • INF Code: 712
    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Sensor 2 (GL2) malfunction).
  • INF Code: 713
    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Zero point calibration malfunction).
  • INF Code: 714
    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Two-value comparison malfunction).

Yaw rate sensor (Airbag ECU assembly) internal malfunction

-

C1243

Deceleration Sensor Stuck

561

562

563

564

565
  • INF Code: 561
    • An acceleration sensor malfunction occurs 16 times or more when the vehicle speed drops from above 30 km/h (19 mph) to 0 km/h (0 mph).
  • INF Code: 562, 563, 564, 565
    • A stuck acceleration sensor value is determined.

Acceleration sensor (Airbag ECU assembly) internal stuck malfunction

-

C1244

Open or Short Circuit in Deceleration Sensor Circuit

571

Either of the following is detected:

  • Difference between GL1 and GL2 does not become less than 0.4 G for 60 seconds or more after reaching 0.6 G when the vehicle is stopped.
  • A malfunction signal from the acceleration sensor is received.
  • Acceleration sensor (Airbag ECU assembly) installed improperly
  • Acceleration sensor (Airbag ECU assembly)

-

C1245

Abnormal Output in Deceleration Sensor

581

At a vehicle speed of 30 km/h (19 mph) or more, difference between longitudinal 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 ECU assembly) installed improperly
  • Acceleration sensor (Airbag ECU assembly)

-

C1279

Abnormal Output Voltage in Deceleration Sensor

-

Detected only during Test Mode.
  • Sensor installation
  • Acceleration sensor (Airbag ECU assembly)

-

CAUTION / NOTICE / HINT

NOTICE:

When replacing the yaw rate and acceleration sensor (airbag ECU assembly), perform zero point calibration.

Click here

HINT:

When U0123 and/or U0124 is output together with C1234, C1243, C1244, and/or C1245, inspect and repair the trouble areas indicated by U0123 and/or U0124 first.

Click here

PROCEDURE

1.

CHECK 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 (READY).

(d) Drive the vehicle at a speed of 30 km/h (19 mph) or more, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.

(e) Turn the power switch on (IG) again and check that no CAN communication system DTCs are output.

Click here

(f) Check if DTC C1210 (Zero Point Calibration of Yaw Rate Sensor undone) or C1336 (Zero Point Calibration of Deceleration Sensor undone) is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Proceed to

DTCs (C1210, C1336 and CAN communication system DTCs) are not output.

A

CAN communication system DTCs are output.

B

DTCs C1210 and/or C1336 are output.

C
B

INSPECT CAN COMMUNICATION SYSTEM

C

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

2.

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 airbag ECU assembly is tightened to the specified torque.

The airbag ECU assembly is not tilted.

NOTICE:

Check the yaw rate and acceleration sensor (airbag ECU assembly) signal after replacement.

Click here

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.

Click here

OK

REPLACE AIRBAG ECU ASSEMBLY

NG

INSTALL AIRBAG ECU ASSEMBLY CORRECTLY

READ NEXT:

 Foreign Object is Attached on Tip of Front Speed Sensor RH (C1235,C1236,C1238,C1239,C1275-C1278)

DESCRIPTION When foreign matter adheres to a speed sensor tip or speed sensor rotor, these DTCs are stored. The presence of foreign matter can be judged when an abnormal waveform is received from a se

 Low or High Power Supply Voltage (C1241,C1242)

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

 Master Cylinder Pressure Sensor (C1246,C1281,C1364)

DESCRIPTION The regulator pressure sensor and wheel cylinder pressure sensor are built into the brake actuator. They measure their respective pressures and send signals to the skid control ECU (brake

SEE MORE:

 Short in Curtain Shield Airbag (RH) Squib Circuit (B1830-B1833)

DESCRIPTION The curtain shield squib RH circuit consists of the airbag ECU assembly and curtain shield airbag assembly RH. The circuit instructs the SRS to deploy when deployment conditions are met. These DTCs are stored when a malfunction is detected in the curtain shield squib RH circuit. DTC N

 System Description

SYSTEM DESCRIPTION MULTI CHANNEL FUNCTION (a) The electrical key transmitter sub-assembly and door control receiver can operate on two different RF channels. When an electrical key transmitter sub-assembly is brought within an exterior detection area, key verification begins. If key verification fai

© 2016-2024 Copyright www.lexunx.com