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TROUBLE SYMPTOM CHART
cautionDuring diagnosis, a DTC associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for DTC(s). If DTC(s) are set, erase them all.
Trouble symptomInspection procedureReference pages or actions
Scan tool (M.U.T.-IIISE) cannot communicate with electric power steering system <ECU power supply circuit system check>.1
The steering has become heavy, but the electric power steering warning display does not illuminate (This is normal, because the electric power steering is limiting assist operation).
noteIf the vehicle is driven under heavy load (e.g. consecutively turning the steering to full lock or severe cornering), the electric power steering motor drive circuit will become hot. In this case, the electric power steering system will limit assist operation by decreasing the motor current to avoid damage. In this case, the steering will become heavy, but the electric power steering warning light does not illuminate. If the circuit temperature falls after a while, the assist operation will return to the normal level.
-Reproduce the steering operation, which your customer did. Check the scan tool (M.U.T.-IIISE) special function, test, Event record item to No.1 from No.10, and confirm that the electric power steering system limited the assist operation (Refer to ). Note that this is not a failure.
When the ignition switch is turned on, the system does not perform the bulb check for the electric power steering warning light (The electric power steering warning light does not illuminate until the engine is started).
noteThe ignition switch is turned to the ON position (within approximately 3 second) again immediately after it is turned to the LOCK (OFF) position, the electric power steering warning light does not illuminate.
-Replace the combination meter (Refer to GROUP 54A - Combination Meter ).
When turning the steering wheel, there is a difference in steering force between right turn and left turn.-Since the neutral point correction of the torque sensor is not correct and the neutral point may be deviated, the neutral position learning of the torque sensor is executed again (Refer to ).
The steering wheel return is slow.-Confirm the DTC because the control may be invalid.
When the heated steering wheel switch is turned on, the heated steering wheel is not activated. <Vehicles with heated steering wheel>2
The illumination light in the heated steering wheel switch does not come on. <Vehicles with heated steering wheel>3
The indicator for the heated steering wheel switch does not come on. <Vehicles with heated steering wheel>4