BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 C
Service Category: Brake	Section: Brake Control/Dynamic Control System
Model Year: 2008	Model: Sequoia	Doc ID: RM000001K2700JX
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

C1231/31

Steering Angle Sensor Circuit Malfunction

DESCRIPTION

The steering angle sensor signal is sent to the skid control ECU via the CAN communication system. When there is a malfunction in the CAN communication system, it will be detected by the diagnostic function.

DTC Code	DTC Detection Condition	Trouble Area
C1231/31	When any of following conditions detected: Skid control ECU receives abnormal signals from steering angle sensor. Skid control ECU receives abnormal voltage signals from steering angle sensor. Despite calibration being conducted by skid control ECU, it does not finish within 15 seconds. Abnormal difference between yaw rate and deceleration sensor and steering angle sensor signals continues for approximately 2 seconds or more during driving.	Steering angle sensor Steering angle sensor circuit Steering angle sensor power supply CAN communication system VSC actuator (skid control ECU)

HINT:

DTC C1231/31 is cleared automatically when the ignition switch is turned from off to ON after the voltage supply to the steering angle sensor returns to normal.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When U0073/94, U0123/62, U0124/69 or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/69 or U0126/63 first.

NOTICE:

When replacing the VSC actuator assembly, perform zero point calibration .

PROCEDURE

1.	PERFORM INITIALIZATION OF STEERING ANGLE SENSOR

(a) Check that the steering wheel is in the centered position.

(b) Disconnect the negative battery terminal for more than 2 seconds.

NOTICE:

After the ignition switch is turned off, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch off, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.

(d) After driving the vehicle straight ahead at 15 km/h (9.3 mph) or more for a few seconds, drive the vehicle at a speed of 45 km/h (28 mph) or more and turn the steering wheel to the right and left for several seconds.

2.	READ VALUE USING TECHSTREAM (STEERING ANGLE SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Check that the steering wheel is centered.

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

(1) Techstream

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Steering Angle Sensor

Steering angle sensor /

min.: -3276.8°, max.: 3276.7°

Left turn: Increase

Right turn: Decrease

Steering Angle Value

Steering angle value /

min.: -3276.8°, max.: 3276.7°

Min.: -3276.8°

Max.: 3276.7°

(f) Check that the steering wheel turning angle of the steering angle sensor changes when turning the steering wheel.

OK:

Turning the steering wheel to the left: Value increases

Turning the steering wheel to the right: Value decreases

3.	RECONFIRM DTC

(a) Clear the DTC .

(b) Start the engine.

(c) After driving the vehicle straight ahead at 15 km/h (9.3 mph) or more for a few seconds, drive the vehicle at a speed of 45 km/h (28 mph) or more and turn the steering wheel to the right and left for several seconds.

(d) Check if the same DTC is recorded .

Result

Result	Proceed to
DTC is output	A
DTC is not output	B

4.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if the CAN communication system DTC is output .

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

5.	CHECK STEERING ANGLE SENSOR

(a) Check that the steering angle sensor has been installed correctly .

OK:

The sensor is installed correctly.

6.	CHECK HARNESS AND CONNECTOR (STEERING ANGLE SENSOR - BATTERY AND BODY GROUND)

(a) Remove the steering wheel and the column cover lower.

(b) Disconnect the steering angle sensor connector.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
H6-1(IG) - Body ground	Ignition switch ON	11 to 14 V
H6-3 (BAT) - Body ground	Always	11 to 14 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
H6-2 (ESS) - Body ground	Always	Below 1 Ω

7.	REPLACE STEERING ANGLE SENSOR

(a) Replace the steering angle sensor .

8.	RECONFIRM DTC

(a) Clear the DTC .

(b) Start the engine.

(c) Drive the vehicle at a speed of 45 km/h (28 mph) or more and turn the steering wheel to the right and left for several seconds.

(d) Check if the same DTC is recorded .

Result

Result	Proceed to
DTC is output	A
DTC is not output	B