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
	Front wheel alignment (incorrect)	Click here
	Steering column assembly	Click here
	Torque sensor (Steering column assembly)	-
	Power steering motor assembly (Steering column assembly)	-
	Speed sensor circuit (w/ VSC)	Click here Click here
	Speed sensor circuit (w/o VSC)	Click here
	Battery and power source system	-
	Power steering ECU assembly power source voltage and relay	Click here
	Power steering ECU assembly	Click here
	CAN communication system	Click here Click here
Steering effort differs between turning right and left, or steering effort is uneven	Front tires (improperly inflated, unevenly worn)	Click here
	Front wheel alignment (incorrect)	Click here
	Steering gear assembly	Click here
	Torque sensor (Steering column assembly)	-
	Steering column assembly	Click here
	Power steering motor assembly (Steering column 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	Speed sensor circuit (w/ VSC)	Click here Click here
	Speed sensor circuit (w/o VSC)	Click here
	Torque sensor (Steering column assembly)	-
	Power steering motor assembly (Steering column assembly)	-
	Power steering ECU assembly	Click here
	CAN communication system	Click here Click here
A knocking (or clunking) sound occurs when turning the steering wheel back and forth while power steering is operating	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
	Steering column assembly	Click here
Friction occurs when turning the steering wheel during low-speed driving	Power steering motor assembly (Steering column assembly)	-
	Steering column assembly	Click here
A high-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped	Power steering motor assembly (Steering column assembly)	-
The steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock with the vehicle stopped	Steering gear assembly	Click here
	Steering column 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 performed (terminals TS and CG of the DLC3 are connected)	TS and CG terminal circuit	Click here
	Power steering ECU assembly	Click here
EPS warning light remains on	EPS warning light circuit	Click here