DTC C1447: External System Malfunction [09/2018 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2018 - ]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

2. Turn the engine switch off.
3. Turn the engine switch on (IG) again and check that no CAN communication system DTCs are output.

   Refer to DIAGNOSIS SYSTEM [03/2017 - 06/2019] , or refer to DIAGNOSIS SYSTEM [06/2019 - 04/2020] , or refer to DIAGNOSIS SYSTEM [04/2020 - 11/2021] , or refer to DIAGNOSIS SYSTEM [11/2021 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 05/2023] , or refer to DIAGNOSIS SYSTEM [05/2023 - ]

4. Start the engine.
5. Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left and check that no speed sensor or yaw rate sensor DTCs are output.

   Refer to DTC CHECK / CLEAR [09/2018 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   HINT: 

   • When CAN communication DTCs are output, inspect and repair the trouble areas indicated by CAN communication first.
   • If a speed sensor or the yaw rate sensor is malfunctioning, DTCs for the steering sensor may be stored even though the steering sensor is normal.
   • If speed sensor and yaw rate sensor DTCs are output simultaneously, repair these malfunctions and then inspect the steering sensor.
   • If DTC C1447 is not output again, the DTC may have been stored due to a temporary loss of steering sensor zero point calibration, such as a loss of calibration due to the power source voltage being low.

   Result

   Result	Proceed to
   DTC C1447 is output.	A
   CAN communication system DTCs are output.	B
   Speed sensor, yaw rate sensor and/or steering sensor (spiral with sensor cable sub-assembly) DTCs are output.	C
   DTCs are not output.	D

Result: 

B 

INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 05/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2023 - ] 

Result: 

C 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2018 - 05/2023]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [05/2023 - ] 

Result: 

D 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2020 - 05/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2023 - ] 

Result: 

A 

See step  2

1. Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.
2. Check that the steering wheel is correctly centered while driving straight ahead.

   HINT: 

   If front wheel alignment and steering are adjusted as a result of an off-center steering wheel, acquire the yaw rate sensor zero point again after the adjustments are completed.

   OK

   The steering wheel is correctly centered.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

ADJUST FRONT WHEEL ALIGNMENT OR STEERING. Refer to  ADJUSTMENT [03/2017 - 04/2020]  , or refer to  ADJUSTMENT [04/2020 - 05/2023]  , or refer to  ADJUSTMENT [05/2023 - ] 

Result: 

OK 

See step  3

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2018 - ]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

2. Start the engine.
3. Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left and check that no speed sensor or yaw rate sensor DTCs are output.

   Refer to DTC CHECK / CLEAR [09/2018 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   HINT: 

   If DTC C1447 is not output again, the DTC may have been stored due to a temporary loss of the steering sensor zero point calibration, such as a loss of calibration due to the power source voltage being low.

   Result

   Result	Proceed to
   DTC C1447 is output.	A
   DTC C1447 is not output.	B

Result: 

A 

REPLACE VGRS ECU (FRONT STEERING CONTROL ECU). Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

B 

END