Refer to "56.Steering Control 6A.Troubleshooting diagnostic system check-electric power steering controls".
1) Connect the scan tool.
2) Start the engine.
3) Observe the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to Chassis CAN communication circuit inspection.
No
Go to Intermittent conditions of electric power steering control system.
Refer to "207.Steering 20D.Symptom intermittent conditions of electric power steering control system".
1) Perform chassis CAN communication circuit inspection.
Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) chassis CAN communication circuit inspection".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool.