Line Pressure Test

Perform mechanical system test preparation. (See MECHANICAL SYSTEM TEST PREPARATION .)
Remove the harness bracket.
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: Harness Bracket With Torque Specification
  Courtesy of MAZDA MOTORS CORP.
Connect the SSTs (49 HD64 406A and, 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).

Fig 2: Identifying Service Special Tool
Courtesy of MAZDA MOTORS CORP.
Start the engine and warm it up until the ATF reaches 60-70°C {140-158°F}.
Shift the selector lever to the D range.
CAUTION:
- Perform the test at least 3 times and calculate the average.
Read the line pressure while the engine is idling for the D range.

Read the line pressure while the engine is idling for the R position and M range in the same manner as in Steps 4 - 5.

LINE PRESSURE

Position/range		Line pressure (kPa {kgf/cm^2, psi})
D, M	Idle	350-410 {3.6-4.1, 51-59}
R	Idle	580-670 {6.0-6.8, 85-97}

Stop the engine, then replace the SST (49 B019 901B) with the gauge of the SST (49 0378 400C).
Connect the M-MDS to the DLC-2.
Measure the LPS PID value.
Start the engine.
Firmly depress the brake pedal with the left foot.
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 13 and 14 within 5 s.
  
  Fig 3: Locating DLC-2 Connector
  Courtesy of MAZDA MOTORS CORP.
Gradually depress the accelerator pedal with the right foot.
When the engine speed no longer increases, quickly read the line pressure and release the accelerator pedal.
Shift the selector lever to the N position and idle the engine for 1 min or more to cool the ATF.
Verify that the line pressure and LPS PID current values change according to the following graph by changing the shift throttle opening angle when shifting to the D range and R position with the engine running.
- 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.
  
  Fig 4: Line Pressure And Throttle Opening Graph
  Courtesy of MAZDA MOTORS CORP.
  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.
Remove the SSTs.

Install a test plug in the inspection port.

Tightening torque

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

LINE PRESSURE TEST EVALUATION

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