Line Pressure Test: Notes

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Line pressure cannot be measured on the JA5A-EL automatic transaxle. Measure the low clutch pressure in place of D and M range line pressures. Measure the reverse clutch pressure in place of R position line pressure.

Engine idling.
1. Perform mechanical system test preparation. (See MECHANICAL SYSTEM TEST PREPARATION .)
  WARNING:
  - Removing the 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. Remove the plug and O-ring shown in Fig 1.
  
  Fig 1: Identifying Front Position Of The DM Range
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Identifying Line Pressure Inspection Port
  Courtesy of MAZDA MOTORS CORP.
3. Connect the SSTs (49 UN01 1610, 49 B019 901B, and 49 0378 400C) to the low clutch pressure inspection port (D and M range line pressures) or reverse clutch pressure inspection port (R position line pressure).
4. Start the engine and warm it up until the ATF reaches 60-70°C (140-158°F).
5. Shift the selector lever to D range.
6. Read the line pressure at idle for the remaining ranges in the same manner.
  - M range
  - R position
  ATF temperature
  
  60-70 °C (140-158 °F)
  
  Turn off all electrical loads
  
  Fig 3: Testing Line Pressure (1 Of 2)
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 4: Testing Line Pressure (2 Of 2)
  Courtesy of MAZDA MOTORS CORP.
7. Turn the engine off.
Engine stall speed.
CAUTION:
- Perform the line pressure test at engine idling prior to performing the test at engine stall. If line pressure is low at idle, do not perform the test at engine stall or further transaxle damage will occur.
1. Replace the SST (49 B019 901B) with the gauge of the SST (49 0378 400C).
2. Start the engine.
  CAUTION:
  - Do not maintain WOT in any gear range for more than 5 seconds or transaxle damage will occur.
3. Firmly depress the brake pedal with the left foot, and then gradually depress the accelerator pedal to the floor (WOT) with the right.
4. When the engine speed no longer increases, quickly read the line pressure and release the accelerator pedal.
5. Shift the selector lever to N position and let the engine idle for 1 minute or more to cool the ATF.
6. Read the line pressure at the engine stall speed for the remaining ranges in the same manner.
  - M range
  - R position
  ATF temperature
  
  60-70°C (140-158°F)
  
  Turn off all electrical loads
  
  Fig 5: Testing Stall Speed
  Courtesy of MAZDA MOTORS CORP.
7. Shift the selector lever to P position.
8. Turn off the engine.
9. Remove the SSTs and install a new square head plug and O-ring in the line pressure inspection port.
Tightening torque

4.91-9.80 N.m (50-100 kgf.cm, 43.4-86.7 in.lb)