Line Pressure Test
WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
- 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 cause severe burns. Before removing the plug, allow the ATF to cool.
- Connect the SSTs to the line pressure inspection port.
- Shift the selector lever to D range and read the line pressure at idle.
- Connect the SST
to the line pressure inspection port.CAUTION:
- If the accelerator pedal (AP) is pressed for longer than 5 seconds while the brake pedal is pressed, the transmission could be damaged. Therefore, perform both Steps 5 and 6 within 5 seconds.
- Firmly depress the brake pedal with the left foot, and gently depress the AP to the floor with the right.
- When the engine speed no longer increases, quickly read the line pressure and release the AP.
- Shift the selector lever to the N position and let the engine idle for 1 minute or more to cool the ATF.
- Read the line pressure at idle and at the engine stall speed for the 2, 1 ranges, and R position in the same manner.SPECIFIED LINE PRESSURE
Position/Range Line pressure kPa {kgf/cm2, psi} Idle Stall D, 2, 1 370-420 {3.7- 4.2, 53-59} 960-1,110 {9.8- 11.4, 140-162} R 520-580 {5.3- 5.9, 76-83} 1,270-1,520 {13.0-15.4, 185- 218} WARNING:- Removing the SST when the ATF is hot can be dangerous. Hot ATF can come out of the opening and cause severe burns. Before removing the SST, allow the ATF to cool.
- Remove the SSTs.
- Apply ATF to a new O-ring.
- Install the O-ring to the plug.
- Install a plug in the inspection port.
Tightening torque
- 5.9-8.8 N.m {60-90 kgf.cm, 53-78 in.lbf}
EVALUATION OF LINE PRESSURE TEST
| Line pressure | Possible cause |
|---|---|
| Low pressure in all ranges | Primary regulator valve sticking Throttle valve sticking Throttle cable misadjustment Worn oil pump |
| Low pressure in D range | Oil is leaking from hydraulic circuit of D range |
| Low pressure in R position | Oil is leaking from hydraulic circuit of R position |
| High pressure in all ranges | Primary regulator valve sticking Throttle valve sticking Throttle cable misadjustment |