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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 369 (Automatic Transaxle [Service, Removal & Installation Aw6A-El)) >> Mechanical System Test >> Line Pressure Test

Line Pressure Test

WARNING: This page is about a different car, the 2005 Mazda 6. 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 test plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the test plug, allow the ATF to cool.
  2. Connect the SSTs  (49 HD64 406A and, 49 0378 400C) to the line pressure inspection port and replace the gauge of the SST  (49 0378 400C) with the SST  (49 B019 901B).
    Fig 1: Connecting SSTs To Line Pressure Inspection Port
    G03644772Courtesy 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.
    CAUTION:
    • Perform the test at least 3 times and calculate the average.
  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 R position 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 400C).
  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 transaxle 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

    Position/range Line pressure (kPa {kgf/cm2 , psi})
    D, M Idle 350-410 {3.6-4.1, 51-59}
    Stall 1,375-1,465 {14.1-14.9, 200-212}
    R Idle 580-670 {6.0-6.8, 85-97}
    Stall 1,870-2,090 {19.1-21.3, 272-303}
    WARNING:
    • Removing the SST when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the SST, allow the ATF to cool.
  15. Remove the SSTs  .
  16. Install a test plug in the inspection port.

    Tightening torque 

    5.9-8.8 N.m {61-89 kgf.cm, 53-77 in.lbf} 

EVALUATION OF LINE PRESSURE TEST

Condition Possible cause
Low pressure in D, R only
  • Line pressure control solenoid malfunction
  • Primary regulator valve malfunction
  • Oil pump malfunction
  • Oil leaking from D or R range hydraulic circuit
Higher pressure in D, R only
  • Line pressure control solenoid malfunction
  • Primary regulator valve malfunction
Low pressure in D only
  • D range hydraulic circuit malfunction
  • C1 clutch malfunction
Low pressure in R only
  • R range hydraulic circuit malfunction
  • C3 clutch malfunction
  • B2 brake malfunction
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