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Home >> Mazda >> 2012 >> 6 i Sport, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle (Service, Removal & Installation FS5A-El) >> Mechanical System Test >> Line Pressure Test

Line Pressure Test

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.
  1. Remove the aerodynamic under cover NO.2. (See AERODYNAMIC UNDER COVER NO.2 REMOVAL/INSTALLATION .)
  2. Perform the "Mechanical System Test Preparation". (See MECHANICAL SYSTEM TEST PREPARATION .)
  3. Perform the line pressure test with the engine idle at D position.
    1. Remove the square-head plug from the line pressure inspection port.
      Fig 1: Square-Head Plug And Line Pressure Inspection Port With Torque Specification
      G08142704
      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 as following:
      • When using the oil pressure gauge set (49 0378 400C)  , connect the SSTs (49 H019 002, 49 0378 400C, 49 B019 901B)  to the line pressure inspection port as shown in the figure.
      • When using the oil pressure gauge set (49 D019 9A2)  , connect the SSTs (49 D019 910, 49 D019 911, 49 D019 913, 49 D019 909, 49 D019 908)  to the line pressure inspection port as shown in the figure.
      Fig 2: Connecting SSTs To Line Pressure Inspection Port
      G08142705
    3. Start the engine.
    4. Warm-up the transaxle until the ATF temperature reaches 60-70 °C {140-158 °F}  .
    5. Shift the selector lever to D position.
    6. Read the line pressure with the engine idle.
  4. Perform the line pressure test at the engine idle at each position in the same manner.
  5. Stop the engine.
  6. Perform the line pressure test with the engine stall at D position.
    1. Replace the oil pressure gauge as following:
      • When using the oil pressure gauge set (49 0378 400C)  , replace the SST (49 B019 901B) with SST (49 B019 902A)  .
      • When using the oil pressure gauge set (49 D019 9A2)  , replace the SST (49 D019 908) with SST (49 D019 907)  .
        Fig 3: Oil Pressure Gauge And Measurments
        G08142706
    2. Start the engine.
    3. Firmly depress the brake pedal with the left foot.
    4. Shift the selector lever to D position.
      CAUTION:
      • If the accelerator pedal is pressed for longer than 5 s while the brake pedal is pressed, the transaxle could be damaged. Therefore, perform Steps (5)-(6) within 5 s.
    5. Gradually depress the accelerator pedal with the right foot.
    6. When the engine speed no longer increases, quickly read the line pressure and release the accelerator pedal.
    7. Shift the selector lever to N position and let the engine idle for 1 min or more to cool the ATF.
  7. Perform the line pressure test with the engine stall at each position in the same manner.
    • If there is any malfunction, inspect the following "Possible Cause" according to the condition.
    Condition Possible cause
    Low pressure In R, D, M (1GR, 2GR) positions
    • Worn oil pump
    • Oil leakage from oil pump, control valve body, and/or transaxle case
    • Pressure regulator valve sticking
    • Pressure control solenoid A malfunction
    In D, M (1GR, 2GR) positions
    • Oil leakage from forward clutch hydraulic circuit
    In M (2GR) position
    • Oil leakage from 2-4 brake band hydraulic circuit
    In R, M (1GR) positions
    • Oil leakage from low and reverse brake hydraulic circuit
    In R position
    • Oil leakage from reverse clutch hydraulic circuit
    High pressure In R, D, M (1GR, 2GR) positions
    • Pressure regulator valve stuck
    • Pressure control solenoid A malfunction
    LINE PRESSURE SPECIFICATION

    Test Condition Specification (kPa {kgf/cm2 , psi})
    Idle R position 490-710 {5.00-7.23, 71.1-102.0}
    D, M (1GR, 2GR) positions 330-470 {3.37-4.79, 47.9-68.1}
    Stall R position 1,850-2,120 {18.87-21.61, 268.4-307.4}
    D, M (1GR, 2GR) positions 1,200-1,320 {12.24-13.46, 174.1-191.4}
  8. Stop the engine.
  9. Remove the SSTs.
    WARNING:
    • Removing the SSTs when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the SSTs, allow the ATF to cool.
  10. Install a new square-head plug in the inspection port.
    NOTE:
    • Do not reuse the square-head plug because it is coated.

      Tightening torque 

    • 4.8-9.8 N.m {49-99 kgf.cm, 43-86 in.lbf}
  11. Install the aerodynamic under cover NO.2. (See AERODYNAMIC UNDER COVER NO.2 REMOVAL/INSTALLATION .)
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