Power Steering System On-Vehicle Inspection

Steering. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Power Assist Systems. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

  1. INSPECT DRIVE BELT (for TR Series Engine)

  2. BLEED AIR FROM POWER STEERING SYSTEM

  3. CHECK FLUID LEVEL

  4. CHECK STEERING FLUID PRESSURE

  5. CHECK STEERING RESISTANCE

Power Steering System -- On-Vehicle Inspection



1. INSPECT DRIVE BELT (for TR Series Engine)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

  1. Visually check the belt for excessive wear, frayed cords, etc.

    Text in Illustration
    *a
    		Incorrect
    If any defect is found, replace the drive belt.
    HINT:
    Cracks on the rib side of the belt are considered acceptable. Replace the belt if there are any missing ribs.


2. BLEED AIR FROM POWER STEERING SYSTEM

  1. Check the fluid level.

  1. Jack up the front of the vehicle and support it with stands.

  1. Turn the steering wheel.

    1. With the engine stopped, turn the steering wheel slowly from lock to lock several times.

  1. Lower the vehicle.

  1. Start the engine. Run the engine at idle for a few minutes.

  1. Turn the steering wheel.

    1. With the engine idling, turn the steering wheel to the left or right full lock position and hold it there for 2 to 3 seconds. Then turn the steering wheel to the opposite full lock position and hold it there for 2 to 3 seconds.

    2. Repeat the step above several times.

  1. Stop the engine.



    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

  1. Check for foaming or emulsification. If the system has to be bled twice because of foaming or emulsification, check for fluid leaks in the system.

    Text in Illustration
    *a
    		Correct
    *b
    		Incorrect

  1. Check the fluid level.



3. CHECK FLUID LEVEL


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

  1. Keep the vehicle level.

  1. With the engine stopped, check the power steering fluid level in the oil reservoir. If necessary, add power steering fluid.

    Power steering fluid (for TMT made):
    "TEXAMATIC 1888" or equivalent
    (for TASA made):
    ATF "DEXRON 3" or equivalent
    HINT:
    If the fluid is hot, check that the fluid level is within the HOT range on the oil reservoir. If the fluid is cold, check that the fluid level is within the COLD range.

  1. Start the engine and run it at idle.

  1. Turn the steering wheel to the left or right full lock position, and then turn the steering wheel to the opposite full lock position. Repeat this several times to raise fluid temperature.

    Standard fluid temperature:
    75 to 80°C (167 to 176°F)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

  1. Check for foaming or emulsification. If foaming or emulsification is identified, bleed air from the power steering system.

    Text in Illustration
    *a
    		Correct
    *b
    		Incorrect


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

  1. With the engine idling, measure the fluid level in the oil reservoir.

    Text in Illustration
    *a
    		Engine idling
    *b
    		Engine stopped
    *c
    		5 mm or Less

  1. Stop the engine.

  1. Wait a few minutes and remeasure the fluid level in the oil reservoir.

    Maximum fluid level increase:
    5 mm (0.197 in.)
    If a problem is found, bleed air from the power steering system.

  1. Check the fluid level.



4. CHECK STEERING FLUID PRESSURE

  1. Disconnect the pressure feed tube.
    for KD Series Engine: Refer to the following procedures (HILUX_TGN26 RM00000138F00YX.html).
    for TR Series Engine: Refer to the following procedures (HILUX_TGN26 RM00000138D01AX.html).



  1. Connect SST as shown in the illustration below.

    SST
    09640-10010(09641-01010,09641-01020,09641-01030)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

    Text in Illustration
    *A
    		KD Series Engine
    *1
    		Pressure Feed Tube
    *2
    		Attachment
    *a
    		in
    *b
    		out


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

    Text in Illustration
    *A
    		TR Series Engine
    *1
    		Pressure Feed Tube
    *2
    		Attachment
    *a
    		in
    *b
    		out
    NOTICE:
    Check that the valve of SST is in the open position.

  1. Bleed air from the power steering system.

  1. Start the engine and run it at idle.

  1. Turn the steering wheel to the left or right full lock position. Then turn the steering wheel to the opposite full lock position. Repeat this several times to raise fluid temperature.

    Standard fluid temperature:
    75 to 80°C (167 to 176°F)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

  1. With the engine idling, close the valve of SST and observe the reading on SST.

    Text in Illustration
    *1
    		Power Steering Link
    *2
    		Oil Reservoir
    *3
    		Vane Pump
    *a
    		Closed
    Minimum fluid pressure:
    8800 to 9300 kPa (89.8 to 94.8 kgf/cm2, 1276 to 1348 psi)
    NOTICE:
    1. Do not keep the valve closed for more than 10 seconds.
    2. Do not let the fluid temperature become too high.
    If the pressure is below the minimum, check for fluid leaks and replace parts as necessary.


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

  1. With the engine idling, fully open the valve.

    Text in Illustration
    *1
    		Power Steering Link
    *2
    		Oil Reservoir
    *3
    		Vane Pump
    *a
    		Open

  1. Measure the fluid pressure at engine speeds of 1000 rpm and 3000 rpm.

    Standard fluid pressure difference:
    490 kPa (4.99 kgf/cm2, 71 psi) or less
    NOTICE:
    Do not turn the steering wheel.
    If the pressure difference is not within the specified range, check for fluid leaks and replace parts as necessary.


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Power Assist Systems.Power Steering System.Power Steering System On-Vehicle Inspection

  1. With the engine idling and the valve fully opened, turn the steering wheel to the full lock position.

    Text in Illustration
    *1
    		Power Steering Link
    *2
    		Oil Reservoir
    *3
    		Vane Pump
    *a
    		Open
    *b
    		Lock Position
    Minimum fluid pressure:
    8800 to 9300 kPa (89.8 to 94.8 kgf/cm2, 1276 to 1348 psi)
    NOTICE:
    1. Do not keep the steering wheel in the lock position for more than 10 seconds.
    2. Do not let the fluid temperature become too high.
    If the pressure is below the minimum, check for fluid leaks and replace parts as necessary.

  1. Disconnect SST.

    SST
    09640-10010(09641-01010,09641-01020,09641-01030)

  1. Connect the pressure feed tube.
    for KD Series Engine: Refer to the following procedures (HILUX_TGN26 RM00000138G00YX.html).
    for TR Series Engine: Refer to the following procedures (HILUX_TGN26 RM00000138B01CX.html).

  1. Bleed air from the power steering system.



5. CHECK STEERING RESISTANCE

  1. Center the steering wheel.

  1. Remove the steering pad.

  1. Start the engine and run it at idle.

  1. Measure the steering resistance in both directions.

    Standard steering resistance (Reference):
    5.5 N*m (56 kgf*cm, 49 in.*lbf)
    HINT:
    The tire type, tire pressure and type of surface beneath the vehicle should be taken into consideration before making your diagnosis.

  1. Tighten the steering wheel set nut.

    Torque:
    50 N*m{510 kgf*cm, 37 ft.*lbf}

  1. Install the steering pad.