Last Modified: 11-29-2007 1.6 C
Service Category: Brake Section: Brake Control/Dynamic Control System
Model Year: 2008 Model: Sequoia Doc ID: RM0000024WG005X
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

C0371/71

Yaw Rate Sensor (Test Mode DTC)

DTC

C1232/32

Stuck in Deceleration Sensor

DTC

C1234/34

Yaw Rate Sensor Malfunction

DTC

C1244/44

Open or Short in Deceleration Sensor Circuit

DTC

C1279/79

Deceleration Sensor Output Voltage Malfunction (Test Mode DTC)

DESCRIPTION

The skid control ECU receives signals from the yaw rate and deceleration sensor via the CAN communication system.

The yaw rate sensor has a built-in deceleration sensor.

If there is trouble in the bus lines between the yaw rate sensor and skid control ECU, DTC U0123/62 (malfunction in CAN communication with the yaw rate sensor) and U0124/69 (malfunction in CAN communication with the deceleration sensor) are output.

DTCs C0371/71 and C1279/79 are cleared when the yaw rate sensor sends a yaw rate and/or deceleration signal failure in test mode. DTCs C0371/71 and C1279/79 are using only in test mode.

DTC Code

DTC Detection Condition

Trouble Area

C0371/71

Detected only during test mode
  • Yaw rate sensor
  • Yaw rate sensor circuit
  • VSC actuator (skid control ECU)

C1232/32

When any of following conditions detected:

  1. Malfunctions in deceleration sensor detected through self-diagnosis.
  2. Malfunctions in deceleration sensor circuit detected.
  3. Power supply to deceleration sensor abnormal (less than 6.5 V or 18 V or more).
  4. When ignition switch turned ON, short between deceleration sensor power supply and either ground or battery.
  • Yaw rate sensor
  • Yaw rate sensor circuit
  • VSC actuator (skid control ECU)

C1234/34

Sensor malfunction signal received from yaw rate sensor
  • Yaw rate sensor
  • Yaw rate sensor circuit
  • VSC actuator (skid control ECU)

C1244/44

G sensor forward and backward operation is malfunctioning (4WD)
  • Yaw rate sensor
  • Yaw rate sensor circuit
  • Skid control ECU

C1279/79

Detected only during test mode
  • Yaw rate sensor
  • Yaw rate sensor circuit
  • VSC actuator (skid control ECU)

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When U0123/62, U0124/69 or U0126/63 is output together with C1232/32, C1234/34 or C1244/44, inspect and repair the trouble areas indicated by U0123/62, U0124/69 or U0126/63 first.

NOTICE:

When replacing the VSC actuator assembly, perform zero point calibration BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION (2008 Sequoia) .

PROCEDURE

1.

CHECK DTC

(a) Clear the DTC(s) BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON again and check that no CAN communication system DTC(s) is output.

(d) Drive the vehicle at a speed of 30 km/h (19 mph) or more and check that no DTCs are output.

Result

Result

Proceed to

DTC is output (relating to yaw rate and deceleration sensor)

A

DTC is output (relating to CAN communication system)

B

DTC is not output

C
A

2.

CHECK YAW RATE SENSOR INSTALLATION

(a) Check that the yaw rate sensor has been installed correctly.

Torque:

13 N*m (127 kgf*cm, 9 ft.*lbf)

OK:

The sensor is tightened to the specified torque.

The sensor is not tilted.

NOTICE:

Do not use an electric impact wrench to tighten the yaw rate sensor bolts because the sensor is sensitive to vibration.
OK

3.

INSPECT YAW RATE SENSOR

(a) Remove the 2 nuts of the sensor bracket and yaw rate sensor with the connector connected BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: YAW RATE AND DECELERATION SENSOR: REMOVAL (2008 Sequoia) .

(b) Connect the Techstream to the DLC3.

(c) Turn the Techstream ON.

(d) Select the Data List mode on the Techstream.

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Deceleration Sensor2

Acceleration sensor 2 reading /

min.: -1.869 G, max.: 1.869 G

Approximately -0.13 to 0.13 G

while stationary

Reading changes when vehicle is bounced.

(e) Place the yaw rate sensor as shown in the illustration and turn the sensor to the right and left.

(f) Check that the deceleration value of the deceleration sensor displayed on the Techstream changes.

OK:

Deceleration value changes.

OK

4.

CHECK YAW RATE SENSOR TERMINAL VOLTAGE

(a) for 4WD:

Disconnect the O12 sensor connector.

(b) for 2WD:

Disconnect the O11 sensor connector.

(c) Turn the ignition switch to ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

for 4WD

Tester Connection

Switch Condition

Specified Condition

O12-3 (VYS) - O12-5 (GYAW)

Ignition switch ON

11 to 14 V

for 2WD

Tester Connection

Switch Condition

Specified Condition

O11-3 (VYS) - O11-5 (GYAW)

Ignition switch ON

11 to 14 V

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for 4WD

Tester Connection

Switch Condition

Specified Condition

O12-5 (GYAW) - Body ground

Ignition switch ON

Below 1 Ω

for 2WD

Tester Connection

Switch Condition

Specified Condition

O11-5 (GYAW) - Body ground

Ignition switch ON

Below 1 Ω
OK