Mechanical System Tests; Perform Mechanical System Tests - Toyota Tundra 2005 Service - Repair - Maintenance

DI−956

MECHANICAL SYSTEM TESTS

1.

PERFORM MECHANICAL SYSTEM TESTS

(a) Measure the stall speed.
The object of this test is to check the overall performance of the transmission and engine by measuring
the stall speeds in the D positions.
NOTICE:
S
Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature 50
to 80°C (122 to 176°F).
S
Do not continuously run this test for longer than 5 seconds.
S
To ensure safety, do this test in a wide, clear level area which provides good traction.
S
The stall test should always be carried out in pairs. One technician should observe the condi-
tions of wheels or wheel stoppers outside the vehicle while the other is doing the test.
(1) Chock all 4 wheels.
(2) Connect a hand−held tester to DLC3.
(3) Fully apply the parking brake.
(4) Using your left foot, keep the brake pedal firmly depressed.
(5) Start the engine.
(6) Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
(7) Quickly read the stall speed at this time.
Stall speed: 2,400 ± 150 rpm
Evaluation:
(a) Stall engine speed is low in D position
(b) Stall engine speed is high in D position
DIAGNOSTICS
Problem
− AUTOMATIC TRANSMISSION (A750E for 1GR−FE)
S Engine power output may be insufficient
S Stator one−way clutch is not operating properly
HINT: If the value is less than the specified value by 600 rpm or
more, the torque converter could be faulty.
S Line pressure is too low
S Clutch No.1 (C
) slipping
1
S One−way clutch No.3 (F
S Improper fluid level
Possible cause
) is not operating properly
3
DIDUU−01