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Line Pressure Test

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform the "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.
    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. Measure the line pressure while idling in D range.
    1. Remove the test plug (for the D range line) and the O-ring.
    2. Connect the SSTs as following:
      • When using the oil pressure gauge set (49 0378 400C), connect the SSTs (49 HD64 406A, 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 912, 49 D019 909, 49 D019 908) to the line pressure inspection port as shown in the figure.
      Fig 1: Locating Test Plug (For D Range Line)
      G06200081Courtesy of MAZDA MOTORS CORP.
      Fig 2: Using Oil Pressure Gauge Sets
      G06200082Courtesy 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.
      LINE PRESSURE SPECIFICATION (WHILE IDLING)

      Test condition Specification (kPa {kgf/cm2 , psi})
      Idle D range 350-410 {3.6-4.1, 51-59}
    6. Stop the engine.
  3. Measure the line pressure while stalling in D range.
    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: Using Oil Pressure Gauge Sets
      G06200083Courtesy of MAZDA MOTORS CORP.
    2. Connect the M-MDS to the DLC-2.
      3. Fig 4: Identifying DLC-2
      G06200045Courtesy of MAZDA MOTORS CORP.
    3. Monitor the pressure control solenoid current (PID LPS) using the M-MDS data monitor function.
    4. Start the engine.
    5. Firmly depress the brake pedal with the left foot.
    6. 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 transmission could be damaged. Therefore, perform Steps (7) and (8) within 5 s.
    7. Gradually depress the accelerator pedal with the right foot.
    8. When the engine speed no longer increases, quickly read the line pressure and release the accelerator pedal.
    9. Verify that the pressure control solenoid current changes as shown in the figure depending on the throttle opening angle.
      Fig 5: Pressure Control Solenoid Current Graph
      G06200085Courtesy of MAZDA MOTORS CORP.
      • The line pressure standard other than when the engine is idling cannot be determined because the maximum line pressure for this automatic transaxle is controlled by vehicle conditions.
    10. Shift the selector lever to the N position and idle the engine for 1 min or more to cool the ATF.
    11. Remove the SSTs.
      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.
    12. 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} 

  4. Measure the line pressure while idling in R range
    1. Remove the test plug (for the R range line) and the O-ring.
      2. Fig 6: Locating Test Plug (For R Range Line)
      G06200086Courtesy of MAZDA MOTORS CORP.
    2. Connect the SSTs as following:
      • When using the oil pressure gauge set (49 0378 400C), connect the SSTs (49 HD64 406A, 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 912, 49 D019 909, 49 D019 908) to the line pressure inspection port as shown in the figure.
      Fig 7: Using Oil Pressure Gauge Sets
      G06200082Courtesy 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 R range
      CAUTION:
      • Perform the test at least 3 times and calculate the average.
    5. Read the line pressure while the engine is idling.
      LINE PRESSURE SPECIFICATION (WHILE IDLING)

      Test condition Specification (kPa {kgf/cm2 , psi})
      Idle R position 580-670 {6 0-6.8, 85-97}
    6. Stop the engine
  5. Measure the line pressure while stalling in R range.
    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 8: Using Oil Pressure Gauge Set
      G06200082Courtesy of MAZDA MOTORS CORP.
    2. Connect the M-MDS to the DLC-2.
      3. Fig 9: Identifying DLC-2
      G06200045Courtesy of MAZDA MOTORS CORP.
    3. Monitor the pressure control solenoid current (PID LPS) using the M-MDS data monitor function.
    4. Start the engine.
    5. Firmly depress the brake pedal with the left foot.
    6. Shift the selector lever to the R range.
      CAUTION:
      • If the accelerator pedal is pressed for more than 5 s while the brake pedal is pressed, the transmission could be damaged. Therefore, perform Steps (7) and (8) within 5 s.
    7. Gradually depress the accelerator pedal with the right foot.
    8. When the engine speed no longer increases, quickly read the line pressure and release the accelerator pedal.
    9. Verify that the pressure control solenoid current changes as shown in the figure depending on the throttle opening angle.
      Fig 10: View Of Pressure Control Solenoid Current Graph
      G06200085Courtesy of MAZDA MOTORS CORP.
      • The line pressure standard other than when the engine is idling cannot be determined because the maximum line pressure for this automatic transaxle is controlled by vehicle conditions.
    10. Shift the selector lever to the N position and idle the engine for 1 min or more to cool the ATF.
    11. Remove the SSTs. 
      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.
    12. 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} 

    EVALUATION OF LINE PRESSURE TEST

    Condition Possible cause
    Lower than specification in D range and R position
    • Line pressure control solenoid malfunction
    • Primary regulator valve malfunction
    • Oil pump malfunction
    • Oil leaking from D range or R position hydraulic circuit
    Constant pressure without fluctuation in hydraulic pressure to throttle in D range and R position
    • Line pressure control solenoid malfunction
    • Control valve body internal malfunction
    Current to throttle does not change in D range and R position
    • TCM internal malfunction
    • Connector malfunction
    Hydraulic pressure in R position is not higher than D range
    • Primary regulator valve malfunction
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