A/T Pressure Tests

Special Tools Required
A/T oil pressure gauge set (  07406-0020004)
 



1.Before testing, be sure the transmission fluid filled to the proper level.

2.4WD: Lift up the vehicle.
2WD: Raise the front of the vehicle, and make sure it is securely supported. Set the parking brake, and block rear wheels securely.

3.Allow the all four wheels (4WD) or front wheels ( 2WD) to rotate freely.

4.Warm up the engine (the radiator fan comes on), then stop it, and connect the tachometer.

5.Connect the oil pressure gauge to the line pressure inspection hole (A) and 4th clutch pressure inspection hole (B). Do not allow dust or other foreign particles to enter the holes while connecting the gages.

 

6.Remove the air cleaner housing, and connect the oil pressure gauge to the 2nd clutch pressure inspection hole (C). Then temporarily reinstall the air cleaner housing.

 

7.Connect the oil pressure gauges to the 1st clutch pressure inspection hole (D) and 3rd clutch pressure inspection hole (E).

 

8.Start the engine, and run it at 2,000 rpm (min-1).

9.Shift to [N] or [P] position, and measure line pressure at the line pressure inspection hole (A).

NOTE: Higher pressure may be indicated if measurements are made in shift lever position other than [N] or [P].

PRESSURE FLUID PRESSURE 
Standard Service Limit 
Line (A) 900-960 kPa (9.2-9.8 kgf/cm2, 130-140 psi) 850 kPa ( 8.7 kgf/cm2, 120 psi) 

10.Shift to [1] position, and measure 1st clutch pressure at the 1st clutch pressure inspection hole (D) with holding engine speed at 2,000 rpm (min-1).

11.Shift to [2] position, and measure 2nd clutch pressure at the 2nd clutch pressure inspection hole (C) with holding engine speed at 2,000 rpm (min-1).

12.Shift to [D] position, and select the over-drive OFF mode by turning the O/D switch off and release the brake pedal (the transmission is in 1st gear).

13.Accelerate the engine to 2,500 rpm (min-1) (the transmission will shift to 2nd gear).

14.Release the accelerator for more than five seconds after the transmission is shifted to 2nd gear; the engine will come down to approx. 1,000 rpm (min-1).

15.Press the accelerator slowly to rev up the engine to 2,000 rpm (min-1) in more than five seconds, then hold it.

16.Measure 3rd clutch pressure at the 3rd clutch pressure inspection hole (E) with holding engine speed at 2,000 rpm (min-1).

17.Select the over-drive mode by turning the O/D switch on, and measure 4th clutch pressure at the 4th clutch pressure inspection hole (B) with holding engine speed at 2,000 rpm (min-1).

18.Shift to [R] position, and measure 4th clutch pressure at the 4th clutch pressure inspection hole (B) with holding engine speed at 2,000 rpm (min-1).

PRESSURE FLUID PRESSURE 
Standard Service Limit 
1st clutch (D)
2nd clutch (C)
3rd clutch (E)
4th clutch (B) 
890-970 kPa (9.1-9.9 kgf/cm2, 130-140 psi) 840 kPa ( 8.6 kgf/cm2, 120 psi) 

19.If the measurements are out of service limit, problems and probable causes are listed in the table below:

Problem Probable causes 
No or low line pressure 
  • Torque converter
  • Regulator valve
  • Torque converter check valve
  • ATF pump
  • Low fluid level
  • Clogged ATF strainer
 
No or low 1st clutch pressure 
  • 1st clutch
  • O-rings
 
No or low 2nd clutch pressure 
  • 2nd clutch
  • O-rings
 
No or low 3rd clutch pressure 
  • 3rd clutch
  • O-rings
 
No or low 4th clutch pressure in [D] position 
  • 4th clutch
  • O-rings
 
No or low 4th clutch pressure in [R] position 
  • Servo valve
  • 4th clutch
  • O-rings
 

20.Install the sealing bolt with a new sealing washer, and tighten the bolts to the specified torque.

TORQUE: 18 N·m (1.8 kgf·m,13 lbf·ft) 

NOTE: Do not reuse old sealing washers.

21.Install the air cleaner housing.