C1297

UF1AE TRANSFER: FOUR WHEEL DRIVE CONTROL SYSTEM: C1297/97: Steering Angle Sensor
C1297/97 - Steering Angle Sensor

DESCRIPTION

- The 4WD control ECU determines that the vehicle is turning based on the signal sent from the steering angle sensor.

- The steering angle sensor signal is sent to the 4WD control ECU via the CAN communication system.

- The 4WD control ECU detects the amount of steering wheel movement and performs "slip control at vehicle start up", according to the amount of movement, and "slip control" to secure high turning performance.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Check the condition of each related circuit connector before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. CHECK DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the engine switch off.

(c) Turn the engine switch on (IG) and check that no CAN communication system DTC is output.

(d) Start the engine.

(e) Drive the vehicle and turn the steering wheel to the right and left at a speed of 24 mph (35 km/h) and check if brake control system DTC and/or a CAN communication system DTC are output.

Result:





HINT
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (CAN COMMUNICATION SYSTEM)

C -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM)
A -- Continue to next step.

2. INSPECT STEERING ANGLE SENSOR

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Drive the vehicle at a speed of 24 mph (35 km/h) or more for approximately 5 seconds.

HINT
The 4WD control ECU acquires steering angle sensor zero point every time the engine switch is turned on (IG) and vehicle is driven at 24 mph (35 km/h) or more for approximately 5 seconds. The ECU stores the previous zero point.

(d) Select the "Data List" on the Techstream Scan Tool Testing and Procedures.

DATA LIST: 4WD





(e) Check that the steering angle sensor value changes in accordance with the steering wheel movement.

HINT
- Steering sensor value displayed on the Techstream is as follows:
* The steering wheel is centered: approximately 0 deg.
* The steering wheel is fully turned to left: -3276.8 deg.
* The steering wheel is fully turned to light: 3276.8 deg.

Standard:

The steering angle sensor value changes in accordance with the steering wheel movement.

NG -- INSPECT STEERING ANGLE SENSOR (STEERING ANGLE SENSOR POWER SOURCE CIRCUIT)

OK -- REPLACE 4WD CONTROL ECU

3. INSPECT STEERING ANGLE SENSOR (STEERING ANGLE SENSOR POWER SOURCE CIRCUIT)

(a) Disconnect the steering angle sensor connector.





(b) Turn the engine switch on (IG).

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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT)
OK -- Continue to next step.

4. INSPECT STEERING ANGLE SENSOR (STEERING ANGLE SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.





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

Standard resistance:





Result:





B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ESS CIRCUIT)

A -- REPLACE STEERING ANGLE SENSOR