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Home >> Mazda >> 2014 >> CX-9 Touring, 3.7L Eng VIN A, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle System >> 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. Perform the "Mechanical System Test Preparation". (See MECHANICAL SYSTEM TEST PREPARATION .)
  2. Measure the line pressure while idling in D position.
    1. Remove the test plug (for the D range line) and the O-ring.
      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.
        Fig 1: Locating Test Plug And O-Ring
        G07625972Courtesy 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 illustration.
      • 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 illustration.
        Fig 2: Connecting SST (49 HD64 406A, 49 0378 400C, 49 B019 901B) To Line Pressure Inspection Port Using Oil Pressure Gauge Set
        G07625973Courtesy 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 position.
    5. Read the line pressure while the engine is idling.
      LINE PRESSURE SPECIFICATION (WHILE IDLING)

      Test condition Specification (kPa {kgf/cm2 , psi})
      Idle D position 335-505 {3.42-5.14, 48.6-73.2}
    6. Stop the engine.
  3. Measure the line pressure while stalling in 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: Measuring Line Pressure Using Oil Pressure Gauge Set
        G07625973Courtesy of MAZDA MOTORS CORP.
    2. Connect the M-MDS to the DLC-2.
    3. Monitor the pressure control solenoid current (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 position.
      Fig 4: DLC-2
      G07822636Courtesy of MAZDA MOTORS CORP.
      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 (7)-( 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 illustration depending on the throttle opening angle.
      Fig 5: Pressure Control Solenoid Current Variation Chart
      G07822637Courtesy of MAZDA MOTORS CORP.
      NOTE:
      • The line pressure standard other than when the engine is idling cannot be determined because the maximum line pressure for this 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 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.
    11. Install the test plug and new O-ring in the inspection port.

      Tightening Torque: 

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

    12. Stop the engine.
  4. Measure the line pressure while idling in R position.
    1. Remove the test plug (for the R position 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 illustration.
      • 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 illustration.
        Fig 6: Locating Line Pressure Inspection Port
        G07625976Courtesy of MAZDA MOTORS CORP.
        Fig 7: Measuring Line Pressure Using Oil Pressure Gauge Set
        G07625977Courtesy 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 position.
    5. Read the line pressure while the engine is idling.
      LINE PRESSURE SPECIFICATION (WHILE IDLING)

      Test condition Specification (kPa {kgf/cm2 , psi})
      Idle Ft position 495-705 {5.05-7.18, 71.8-102.0}
    6. Stop the engine.
  5. Measure the line pressure while stalling in R 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 C D019 907). 
        Fig 8: Measuring Line Pressure Using Oil Pressure Gauge Set
        G07625977Courtesy of MAZDA MOTORS CORP.
    2. Connect the M-MDS to the DLC-2.
    3. Monitor the pressure control solenoid current (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 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 (7)-( 8) within 5 s.
        Fig 9: DLC-2
        G07822636Courtesy of MAZDA MOTORS CORP.
    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 illustration depending on the throttle opening angle.
      Fig 10: Pressure Control Solenoid Current Variation Chart
      G07822642Courtesy of MAZDA MOTORS CORP.
      NOTE:
      • The line pressure standard other than when the engine is idling cannot be determined because the maximum line pressure for this 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 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.
    12. Install the test plug and new O-ring in the inspection port.

      Tightening Torque: 

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

  6. Stop the engine.
    • If there is any malfunction, inspect the following "Possible Cause" according to the condition.
    SYMPTOM CHART

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