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Home >> Mazda >> 2007 >> 5 Touring, 2.3 L >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle [Service, Removal & Installation) >> Mechanical System Test >> Line Pressure Test

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 0378 400C) to the line pressure inspection port and replace the gauge of the SST  (49 0378 400C) with the SST  (49 B019 901B).
  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 R position and M (1GR, 2GR) range in the same manner as in Steps  4- 5.
    Fig 1: Connecting SST (49 0378 400C) To Line Pressure Inspection Port
    G04316470Courtesy of MAZDA MOTORS CORP.
  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 (1GR, 2GR) range and R position in the same manner as in Steps  9- 13.

    Line pressure 

    LINE PRESSURE SPECIFICATION

    Position/range Specification (kPa {kgf/cm2 , psi})
    D, M (1GR, 2GR) Idle 330-470 {3.4-4.7, 48-68}
    Stall 1,160-1,320 (11.8-13.5, 168-191}
    R Idle 490-710 {5.0-7.2, 72-102}
    Stall 1,750-1,970 {17.8-20.1, 254-285}
    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 new square head plug in the inspection port.

    Tightening torque 

    4.8-9.8 N.m {49-99 kgf.cm, 43-85 in.lbf} 

    Evaluation of line pressure test 

    EVALUATION OF LINE PRESSURE TEST POSSIBLE CAUSE

    Condition Possible cause
    Low pressure in all positions/ranges
    • Worn oil pump
    • Oil leaking from oil pump, control valve body, and/or transaxle case
    • Pressure regulator valve stuck
    • Pressure control solenoid malfunction
    • Solenoid reducing valve stuck
    Low pressure in D, M (1GR, 2GR) only
    • Oil leaking from forward clutch hydraulic circuit
    Low pressure in M (2GR) only
    • Oil leaking from 2-4 brake band hydraulic circuit
    Low pressure in M (1GR), R only
    • Oil leaking from low and reverse brake hydraulic circuit
    Low pressure in R only
    • Oil leaking from reverse clutch hydraulic circuit
    Higher pressure in all positions/ranges
    • Pressure control solenoid malfunction and/or open harness
    • Pressure regulator valve stuck
    • TCM malfunction
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