Toyota 4Runner manuals

Toyota 4Runner: 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

See page

Hard steering

Tires (Improperly inflated)


Power steering fluid level (Low)


Drive belt (Loose)


Front wheel alignment (Incorrect)


Steering system joints (Worn)

-

Suspension arm ball joints (Worn)


Steering column (Binding)

-

Vane pump assembly


Rack and pinion power steering gear assembly


Poor return

Tires (Improperly inflated)


Front wheel alignment (Incorrect)


Steering column (Binding)

-

Rack and pinion power steering gear assembly


Excessive play

Steering system joints (Worn)

-

Suspension arm ball joints (Worn)


Intermediate shaft, Sliding yoke (Worn)

-

Front wheel bearing (Worn) (for 2WD)


Front wheel bearing (Worn) (for 4WD)


Rack and pinion power steering gear assembly


Abnormal noise

Power steering fluid level (Low)


Steering system joints (Worn)

-

Vane pump assembly


Rack and pinion power steering gear assembly


Power steering system does not operate

IG power source circuit


VFC power steering solenoid circuit


Power steering ECU communication circuit


Vehicle stability control system


Steering angle sensor


SFI system


Power steering ECU assembly


When the vehicle is idling, steering effort is high (with the vehicle stopped)

Tire size and tire pressure


Power steering fluid level and pressure


Front wheel alignment


IG power source circuit


VFC power steering solenoid circuit


Power steering ECU communication circuit


Steering angle sensor


Power steering ECU assembly


Even if vehicle speed increases, steering effort does not increase

VFC power steering solenoid circuit


Power steering ECU communication circuit


Vehicle stability control system


Power steering ECU assembly


Power steering warning light is abnormal

Power steering warning light circuit


System Description
SYSTEM DESCRIPTION 1. DESCRIPTION (a) In the Variable Flow Control (VFC) power steering system, the power steering ECU assembly receives the steering angle signal, steering zero point memory, the ...

Terminals Of Ecu
TERMINALS OF ECU 1. CHECK POWER STEERING ECU ASSEMBLY (a) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Col ...

Other materials about Toyota 4Runner:

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT BRAKE FLUID LEVEL IN RESERVOIR (a) Check the fluid level and add fluid if necessary. Brake Fluid: SAE J1703 or FMVSS No. 116 DOT3 HINT: Add fluid to the reservoir MAX line. ...

Steering Angle Sensor Unusual Bank Angle Detected (C1440)
DESCRIPTION If the skid control ECU determines that the vehicle is being driven at a steep bank angle, the skid control ECU stores DTC C1440 while VSC operation is temporarily disabled. It is not a malfunction if the system and sensor circuits are normal ...

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