Toyota Tundra Service Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT DRIVE BELT

(a) Visually check the belt for excessive wear, frayed cords, etc. If any defect is found, replace the drive belt. HINT: Cracks on the rib side of a belt are considered acceptable. Replace the belt if there are any missing ribs. After installing a belt, check that it fits properly in the ribbed grooves. Check with your hand to confirm that the belt has not slipped out of the grooves on the bottom of the pulley.

2. BLEED POWER STEERING SYSTEM

(a) Check the fluid level.

(b) Jack up the front of the vehicle and support it with stands.

(c) Turn the steering wheel.

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

(d) Lower the vehicle.

(e) Start the engine.

(f) Run the engine at idle for a few minutes.

(g) Turn the steering wheel.

(1) With the engine idling, turn the wheel left or right to the full lock position and keep it there for 2 to 3 seconds, and then turn the wheel to the opposite full lock position and keep it there for 2 to 3 seconds.*1

(2) Repeat *1 several times.

(h) Stop the engine.

(i) 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.

(j) Check the fluid level.

3. CHECK FLUID LEVEL

(a) Keep the vehicle horizontal.

(b) With the engine stopped, check the fluid level in the reservoir.

If necessary, add fluid.

Fluid:

ATF DEXRON II or III, or equivalent

HINT:

If the fluid is hot, check that the fluid level is within the HOT range. If the fluid is cold, check that the fluid level is within the COLD range.

(c) Start the engine and run it at idle.

(d) Turn the steering wheel from lock to lock several times to raise the fluid temperature.

Fluid temperature:

80°C (176°F)

(e) Check for foaming or emulsification. If foaming or emulsification is identified, bleed the power steering system.

(f) With the engine idling, measure the fluid level in the reservoir.

(g) Stop the engine.

(h) Wait a few minutes and remeasure the fluid level in the reservoir.

Maximum fluid level rise:

5.0 mm (0.197 in.)

If the fluid level rise is more than the maximum, bleed the power steering system.

(i) Check the fluid level.

4. CHECK STEERING FLUID PRESSURE

(a) Disconnect the pressure feed tube from the vane pump (See page ).

(b) Connect SST as shown in the illustration.

SST: 09640-10010

09641-01010

09641-01030

09641-01060

NOTICE:

Check that the valve of SST is in the open position.

(c) Bleed the power steering system.

(d) Start the engine and run it at idle.

(e) Turn the steering wheel from lock to lock several times to raise the fluid temperature.

Fluid temperature:

80°C (176°F)

(f) With the engine idling, close the valve of SST and observe the reading on SST. Minimum fluid pressure: 8336 kPa (85.0 kgf/cm2, 1209 psi) NOTICE: Do not keep the valve closed for more than 10 seconds. Do not allow the fluid temperature to become too high. If the pressure is less than the minimum, check for fluid leaks and replace parts as necessary.

(g) With the engine idling, fully open the valve.

(h) Measure the fluid pressure at engine speeds of 1000 rpm and 3000 rpm.

Difference in fluid pressure:

490 kPa (5.0 kgf/cm2, 71 psi) or less

NOTICE:

Do not turn the steering wheel.

If the pressure difference is above the specified range, check for fluid leaks and replace parts as necessary.

(i) With the engine idling and the valve fully open, turn the steering wheel left or right to the full lock position. Observe the reading on SST. Minimum fluid pressure: 8336 kPa (85.0 kgf/cm2, 1209 psi) NOTICE: Do not keep the steering wheel in the full lock position for more than 10 seconds. Do not allow the fluid temperature to become too high. If the pressure is less than the minimum, check for fluid leaks and replace parts as necessary.

(j) Disconnect SST.

SST: 09640-10010

09641-01010

09641-01030

09641-01060

(k) Connect the pressure feed tube (See page ).

(l) Bleed the power steering system.