Line Pressure Test

1. Perform mechanical system test preparation. (See MECHANICAL SYSTEM TEST PREPARATION .)
   WARNING:

   • Removing the square head plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the square head plug, allow the ATF to cool.
2. Connect the SSTs  (49 HD64 406A, 49 0378 400B) to the line pressure inspection port and replace the gauge of the SST  (49 0378 400B) with the SST  (49 B019 901B).
   Fig 1: Locating Line Pressure Inspection Port

   Courtesy of MAZDA MOTORS CORP.
3. Start the engine and warm it up until the ATF reaches 60-70 °C {140-158 °F}. 
4. Shift the selector lever to the D range.
5. Read the line pressure while the engine is idling for the D range.
6. Read the line pressure while the engine is idling for the P, R, N positions and M range in the same manner as in Steps  4- 5.
7. Stop the engine, then replace the SST  (49 B019 901B) with the gauge of the SST  (49 0378 400B).
Fig 2: Checking Line Pressure By Gauge
Courtesy of MAZDA MOTORS CORP.
8. Start the engine.
9. Firmly depress the brake pedal with the left foot.
10. Shift the selector lever to the D range.
    CAUTION:

    • If the accelerator pedal is pressed for more than 5 s while the brake pedal is pressed, the transmission could be damaged. Therefore, perform Steps 11 and  12 within 5 s.
11. Gradually depress the accelerator pedal with the right foot.
12. When the engine speed no longer increases, quickly read the line pressure and release the accelerator pedal.
13. Shift the selector lever to the N position and idle the engine for 1 min or more  to cool the ATF.
14. Read the line pressure at the engine stall speed for the M range and R position in the same manner as in Steps  9- 13.

    Line pressure 

    LINE PRESSURE SPECIFICATION
    
    

    Position/Range		Line pressure (kPa {kgf/cm2 , psi})
    D, M	Idle	320-450 {3.3-4.6, 46-65}
    	Stall	1,130-1,330 {11.5-13.6, 164-193}
    R	Idle	380-580 {3.9-5.9, 55-84}
    	Stall	1,470-1,700 {15.0-17.3, 213-247}
    P, N	Idle	380-580 {3.9-5.9, 55-84}

    WARNING:

    • Removing the square head plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the square head plug, allow the ATF to cool.
15. Remove the SSTs. 
16. Install a new square head plug and O-ring in the inspection port.

    Tightening torque 

    1. 10.8-12.7 N.m {110-130 kgf.cm, 96-112 in.lbf} 

Evaluation of line pressure test