Toyota CH-R Service Manual: Problem Symptoms Table

Toyota CH-R Service Manual / Power Assist Systems / Power Steering System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

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.

Power Steering System

Symptom	Suspected Area	Link
Heavy steering	Front tires (improperly inflated, unevenly worn)
	Front wheel alignment (incorrect)
	Front suspension (Lower ball joint)
	Steering gear assembly
	Battery and power source circuit
	Power source voltage of power steering ECU assembly
	Power steering ECU assembly
	Vehicle condition (Steering wheel is turned from left to right repeatedly with vehicle stopped or heavy load is continuously applied to vehicle)
Steering effort differs between right and left or is uneven	Rotation angle sensor initialization and torque sensor zero point calibration incomplete
	Front tires (improperly inflated, unevenly worn)
	Front wheel alignment (incorrect)
	Front suspension (Lower ball joint)
	Steering gear assembly
	Torque sensor (Electric power steering column sub-assembly)
	Electric power steering column sub-assembly
	Power steering ECU assembly
While driving, steering effort does not change in accordance with vehicle speed, or steering wheel does not return to its centered position easily	Skid control ECU (brake actuator assembly)
	Speed sensor
	Torque sensor (Electric power steering column sub-assembly)
	Power steering ECU assembly
	CAN communication system
Friction sounds occur when turning steering wheel during low speed driving	Power steering motor (Power steering ECU assembly)
	Electric power steering column sub-assembly
	Spiral with cable sensor sub-assembly
	Steering column cover contacting steering wheel assembly
High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped	Power steering motor (Power steering ECU assembly)
	Steering wheel installation (incorrect)
Steering wheel vibrates and noise occurs when turning steering wheel from lock to lock	Power steering motor (Power steering ECU assembly)
	Electric power steering column sub-assembly
	Steering wheel installation (incorrect)
DTCs cannot be output (terminals TC and CG of the DLC3 are connected)	TC and CG terminal circuit
	IG power source circuit
	Meter / gauge system
EPS warning light remains on	EPS warning light circuit

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the power steering system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSH ...

Diagnosis System

DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here CHECK WARNING LIGHT (a) When a problem occurs in the power steering system, the EPS warning light in the combination meter assembl ...

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