POWER STEERING SYSTEM PROBLEM SYMPTOMS TABLE

Tip:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table.
Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Table 1. Power Steering System
Symptom	Suspected Area	Link
Heavy steering	Front tires (improperly inflated, unevenly worn)	Click here Click here
	Front wheel alignment (incorrect)	Click here
	Front suspension (Lower ball joint)	Click here
	Electric power steering column sub-assembly	Click here
	Steering gear assembly	Click here
	Torque sensor (built into electric power steering column sub-assembly)	-
	Power steering motor assembly	-
	Speed sensor circuit	Click here
	Auxiliary battery and power source system	-
	Power steering ECU assembly power source voltage	Click here
	Power steering ECU assembly	Click here
Steering effort differs between turning right and left, or steering effort is uneven	Front tires (improperly inflated, unevenly worn)	Click here Click here
	Front wheel alignment (incorrect)	Click here
	Front suspension (Lower ball joint)	Click here
	Steering gear assembly	Click here
	Torque sensor (built into electric power steering column sub-assembly)	-
	Electric power steering column sub-assembly	Click here
	Power steering motor assembly	-
	Power steering ECU assembly	Click here
While driving, steering effort does not change in accordance with vehicle speed or the steering wheel does not return properly	Front suspension (Lower ball joint)	Click here
	Speed sensor circuit	Click here
	Torque sensor (built into electric power steering column sub-assembly)	-
	Power steering motor assembly	-
	Power steering ECU assembly	Click here
	CAN communication system (for LHD)	Click here
	CAN communication system (for RHD)	Click here
A knocking (or clunking) sound occurs when turning the steering wheel back and forth while power steering is operating	Front suspension (Lower ball joint)	Click here
	Steering intermediate shaft	-
	Power steering ECU assembly	Click here
Noise occurs when turning the steering wheel during low-speed driving	Steering gear assembly	Click here
	Electric power steering column sub-assembly	Click here
Friction occurs when turning the steering wheel during low-speed driving	Power steering motor assembly	-
	Electric power steering column sub-assembly	Click here
A high-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped	Power steering motor assembly	-
The steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock with the vehicle stopped	Power steering motor assembly	-
	Steering gear assembly	Click here
	Electric power steering column sub-assembly	Click here
DTCs cannot be output (Terminals TC and CG of the DLC3 are connected)	TC and CG terminal circuit	Click here
	IG power source circuit	Click here
	Combination meter assembly	Click here
Signal check cannot be done (Terminals TS and CG of the DLC3 are connected)	TS and CG terminal circuit	Click here
	Power steering ECU assembly	Click here
Power steering warning light remains on	Power steering warning light circuit	Click here