HYDRAULIC PRESSURE TEST


1.
caution This test must be performed with the CVT fluid temperature within the range of 70 to 80°C.
Start the engine and warm it up until the CVT fluid temperature reaches 70 to 80°C.
2.Stop the engine and block the RH and LH rear wheels with the wheel chocks.



3.Install the following special tools at the hydraulic pressure outlet ports shown in the figure.

  • Oil pressure gauge <3.0 MPa> (MD998330)
  • Joint (MD998331)
  • Joint (MB992127)
note
    DR: Torque converter output pressure port
    PRI: Primary pressure port
    PL: Line pressure port
    FWD: Forward clutch pressure port
    REV: Reverse brake pressure port
4.Restart the engine.
5.Make sure that no CVT fluid leakage is found at the special tool fixing points.
6.Pull the parking brake lever and fully depress the brake pedal. (Maintain this operation until measurement is completed.)
7.
warning For safety, operators must not stand in front of and at the rear of the vehicle during this test.
Measure the hydraulic pressure at each measuring point in the conditions specified in the standard hydraulic pressure table, and check that the measurements are within the standard value.
8.If not within the standard value, take necessary steps according to the hydraulic pressure test diagnosis table.
9.Stop the engine.
10.Replace the O-rings on the plugs for each pressure port.
11.Remove the special tools and fit the plugs in the hydraulic pressure ports.
12.Install the plugs. Then, start the engine and check that no CVT fluid leakage is found around the plugs.

Standard hydraulic pressure table
Measuring conditions
Standard hydraulic pressure (MPa)
Selector lever position
Engine speed
Forward clutch pressure [Pressure at FWD]
Reverse brake pressure [Pressure at REV]
Primary pressure [Pressure at PRI]
Line pressure [Pressure at PL]
Torque converter [Pressure at DR]
P
Idling
0
0
0.1 - 1.5
0.5 - 1.5
0.1 - 1.0
R
0
0.5 - 1.0
0.1 - 1.5
0.5 - 1.5
0.1 - 1.0
N
0
0
0.1 - 1.5
0.5 - 1.5
0.1 - 1.0
D
0.5 - 1.0
0
0.1 - 1.5
0.5 - 1.5
0.1 - 1.0
Ds <Vehicles without paddle shift>
0.5 - 1.0
0
0.1 - 1.5
0.5 - 1.5
0.1 - 1.0
L
0.5 - 1.0
0
0.1 - 1.5
0.5 - 1.5
0.1 - 1.0

Hydraulic pressure test diagnosis table
Symptom
Faulty part
Hydraulic pressure is high at all measuring points.
Incorrect measuring method
Hydraulic pressure is low at all measuring points.
Malfunction of oil pump
Clogged oil strainer
Clogged oil cooler
Malfunction in valve body assembly
Improper installation of valve body assembly
Only forward clutch pressure is abnormal.
Malfunction in valve body assembly
Improper installation of valve body assembly
Faulty seal ring A
Only reverse brake pressure is abnormal.
Malfunction in valve body assembly
Improper installation of valve body assembly
Only primary pressure is abnormal
Malfunction in valve body assembly
Improper installation of valve body assembly
Only line pressure is abnormal.
Malfunction in valve body assembly
Improper installation of valve body assembly
Only torque converter output pressure is abnormal
Malfunction in valve body assembly
Improper installation of valve body assembly
Malfunction of torque converter
Faulty seal ring B
Seal ring location





Yandex.Metrika
MMC-Manuals.ru