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Home >> Mazda >> 2016 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle System (Service Information) >> 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.
    NOTE:
    • Use a suitable oil pressure gauge that corresponds to the line pressure because the maximum scale value differs depending on the oil pressure gauge.
  2. Remove the test plug and O-ring from the line pressure inspection port.
    Fig 1: Removing Test Plug And O-Ring From Line Pressure Inspection Port
    G10952691Courtesy of MAZDA MOTORS CORP.
  3. Install SSTs (49 D019 908, 49 D019 909, 49 D019 910, 49 D019 911, 49 D019 913)  to the line pressure inspection port as shown in the figure.
    Fig 2: Installing SST To Line Pressure Inspection Port
    G10952692Courtesy of MAZDA MOTORS CORP.
  4. Start the engine and warm it up until the ATF reaches 60-70 °C {140-158 °F}  .
  5. Shift the selector lever to the D position.
  6. Measure the line pressure while idling in D position.
  7. Measure the line pressures while idling in the M (1st gear) and R positions using the same procedure.
  8. Stop the engine.
  9. Change the low-pressure gauge (49 D019 908  ) to the high-pressure gauge (49 D019 907  ).
    Fig 3: Changing Low-Pressure Gauge (49 D019 908) To High-Pressure Gauge (49 D019 907)
    G10952693Courtesy of MAZDA MOTORS CORP.
  10. Start the engine.
  11. Strongly depress the brake pedal with the left foot.
  12. Shift the selector lever to the D position.
    CAUTION:
    • To prevent damage to the transmission, measure the line pressure while stalling (Step 13-14) within 5 s.
  13. Slowly depress the accelerator pedal fully with the right foot all the way down.
  14. Read the line pressure quickly while stalling, and remove the right foot from the accelerator pedal.
  15. Shift the selector lever to the N position and idle for 1 min or more  .
  16. Measure the line pressure while stalling for positions other than D in the same procedure.
    • If there is any malfunction, one of the following causes may have occurred:
    Condition Possible cause
    Higher in R, D, and M (1GR) position
    • Line pressure control solenoid malfunction
    • Primary regulator valve malfunction
    Lower in R, D, and M (1GR) position
    • Line pressure control solenoid malfunction
    • Primary regulator valve malfunction
    • Oil pump malfunction
    Lower in D position
    • Hydraulic circuit of D malfunction
    • C1 clutch malfunction
    Lower in R position
    • Hydraulic circuit of R malfunction
    • C3 clutch malfunction
    • B4 brake malfunction
    LINE PRESSURE SPECIFICATION

    Measurement conditions Specification (kPa {kgf/cm2 , psi})
    D and M (1GR) position Idle 350-430 kPa {3.57-4.38 kgf/cm2 , 50.8- 62.3 psi}
    Stall 900-1, 080 kPa {9.18-11.01 kgf/cm2 , 131.0-156.6 psi}
    R position Idle 760-950 kPa {7.75-9.68 kgf/cm2 , 111-137 psi}
    Stall 1, 410-1, 630 kPa {14.38-16.62 kgf/cm2 , 204.6-236.4 psi}
    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.
  17. Remove the SSTs  .
  18. Install the test plug and O-ring in the inspection port.

    Tightening torque 

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