Last Modified: 11-29-2007 1.6 C
Service Category: Brake Section: Brake Control/Dynamic Control System
Model Year: 2008 Model: Sequoia Doc ID: RM000000WE201FX
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

C0200/31

Right Front Wheel Speed Sensor Signal

DTC

C0205/32

Left Front Wheel Speed Sensor Signal

DTC

C1271/71

Low Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC

C1272/72

Low Output Signal of Front Speed Sensor LH (Test Mode DTC)

DTC

C1275/75

Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC

C1276/76

Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)

DTC

C1330/35

Open Circuit in Right Front Wheel Speed Sensor Circuit

DTC

C1331/36

Open Circuit in Left Front Wheel Speed Sensor Circuit

DESCRIPTION

The speed sensors detect the wheel speeds and send appropriate signals to the skid control ECU.

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change as the rotors turn.

The speed sensors detect those magnetic changes and send pulse signals to the skid control ECU. The ECU monitors the wheel speeds through these pulse signals to control the ABS control system.



DTC Code

DTC Detection Condition

Trouble Area

C0200/31

C0205/32

When any of following conditions detected:

  1. When vehicle speed 15 km/h (9 mph), wheel speed 6 km/h (4 mph) or less.
  2. At vehicle speed of 45 km/h (28 mph) or more, open in sensor harness occurs intermittently for 0.2 seconds or more.
  3. When vehicle speed between 10 km/h (6 mph) and 15 km/h (9 mph) for 3 minutes, one wheel speed 0 km/h (0 mph).
  4. Pressure reduction mode of ABS system lasts for 28 seconds or more.
  5. When vehicle driven at speed of 20 km/h (12 mph) or more, difference between wheel speeds indicated by two sensors twice or more for 30 seconds or more.
  6. Foreign matter adheres to sensor rotor.
  • Front speed sensor
  • Front speed sensor circuit
  • Sensor installation
  • Foreign matter on sensor rotor

C1271/71

C1272/72

Detected only during test mode.
  • Front speed sensor
  • Front speed sensor circuit
  • Sensor installation
  • Foreign matter on sensor rotor

C1275/75

C1276/76

Detected only during test mode.
  • Front speed sensor (open)
  • Front speed sensor circuit (open)

C1330/35

C1331/36

Open in front speed sensor circuit continues for 0.15 seconds or more.
  • Front speed sensor (open)
  • Front speed sensor circuit (open)

HINT:

  • DTCs C0200/31 and C1330/35 are for the front speed sensor RH.
  • DTCs C0205/32 and C1331/36 are for the front speed sensor LH.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

PROCEDURE

1.

READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FR Wheel Speed

Front wheel speed sensor RH reading /

min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)

Actual wheel speed

Similar speed as indicated on speedometer

FL Wheel Speed

Front wheel speed sensor LH reading /

min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)

Actual wheel speed

Similar speed as indicated on speedometer

(d) Check that the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer are almost the same when driving the vehicle.

OK:

The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed.

HINT:

There is a tolerance of +/-10% in the speedometer indication.

OK

2.

PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

(a) Perform a TEST MODE inspection and check for DTCs BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: TEST MODE PROCEDURE (2008 Sequoia) .

OK:

No DTC output.

OK

3.

RECONFIRM DTC

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

(b) Start the engine.

(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

(d) Check if the same DTC(s) is output BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is not output

A

DTC is output

B
A

4.

CHECK FRONT SPEED SENSOR INSTALLATION


(a) Check that the speed sensor installation bolt is tightened properly.

Torque:

11 N*m (107 kgf*cm, 8 ft.*lbf)

OK:

The installation bolt is tightened properly.

OK

5.

CHECK FRONT SPEED SENSOR

(a) Visually check the speed sensor for deformation and damage.

OK:

No deformation or damage.

There is no gap between the sensor and front steering knuckle.

OK

6.

CHECK SPEED SENSOR TIP

(a) Remove the speed sensor BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: FRONT SPEED SENSOR: REMOVAL (2008 Sequoia) .

(b) Check the sensor tip.

OK:

No scratches or foreign matter on the sensor tip.

OK

7.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

(a) Confirm that the skid control ECU connector and speed sensor connector are properly connected.

(b) Disconnect the A19 ECU connector.

(c) Disconnect the z3 and z4 sensor connectors.

(d) Inspect both the connector case and the terminal for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

A19-45 (FR+) - z3-2 (FR+)

Always

Below 1 Ω

A19-46 (FR-) - z3-1 (FR-)

A19-45 (FR+) - Body ground

Always

10 kΩ or higher

A19-46 (FR-) - Body ground

for LH

Tester Connection

Condition

Specified Condition

A19-34 (FL+) - z4-2 (FL+)

Always

Below 1 Ω

A19-33 (FL-) - z4-1 (FL-)

A19-34 (FL+) - Body ground

Always

10 kΩ or higher

A19-33 (FL-) - Body ground
OK

8.

INSPECT FRONT SPEED SENSOR (INPUT VOLTAGE)

(a) Reconnect the A19 ECU connector.

(b) Disconnect the z3 and z4 sensor connectors.

(c) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

z3-2 (FR+) - Body ground

Ignition switch ON

7.5 to 20 V

z4-2 (FL+) - Body ground
OK

9.

RECONFIRM DTC

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

(b) Start the engine.

(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

(d) Check if the same DTC(s) is output BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is output

A

DTC is not output

B
A

10.

REPLACE FRONT SPEED SENSOR

(a) Replace the front speed sensor BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: FRONT SPEED SENSOR: REMOVAL (2008 Sequoia) .

NEXT

11.

RECONFIRM DTC

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

(b) Start the engine.

(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

(d) Check if the same DTC(s) is output BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is output

A

DTC is not output

B
A