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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Automatic Transmission [Service, Removal & Installation)) >> Mechanical System Test >> Line Pressure Test

Line Pressure Test

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
  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
    G01346773Courtesy 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).
  8. Start the engine.
  9. Firmly depress the brake pedal with the left foot.
  10. Shift the selector lever to the D range.
    Fig 2: Connecting To Line Pressure Inspection Port
    G01346774Courtesy of MAZDA MOTORS CORP.
    CAUTION:
    • If the accelerator pedal is pressed for more than 5 seconds while the brake pedal is pressed, the transmission could be damaged. Therefore, perform Steps  11 and  12 within 5 seconds.
  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 

    Fig 3: Line Pressure Specifications
    G01346775Courtesy of MAZDA MOTORS CORP.
    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 

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

    Evaluation of line pressure test 

    Fig 4: Evaluation Of Line Pressure Test
    G01346776Courtesy of MAZDA MOTORS CORP.
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