For 1990-2009 cars

1. Check the fluid. Refer to Transmission Fluid Check
2. Remove the line pressure plug and install J 21867 Pressure Gage (A).
3. Disconnect the vacuum line from the transaxle modulator and connect J 23738-A Vacuum Gage/Pump (B) to the engine vacuum line.

Caution: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.

Notice: The total test running time should not be longer than 2 minutes. Running the test longer than 2 minutes may damage the transaxle.

4. Start the engine and set the parking brake.
5. Note the vacuum pump gage:

• | At sea level, the engine vacuum should be at least 61 kPa (18 in Hg).

• | Engine vacuum will drop about 3.5 kPa (1 in Hg) for every increase in altitude of 305 m (1000 ft).

• | If the engine vacuum is low, refer to Engine, Driveability, and Diagnosis for diagnosis.

6. Disconnect J 23738-A vacuum gage/pump (B) from the engine vacuum line. Connect J 23738-A vacuum gage/pump (B) to the transaxle modulator. Install a plug in the engine vacuum line to prevent a vacuum leak.
7. Raise the engine speed to 1250 RPM.
8. Check the transaxle line pressure:

• | Minimum Line Pressure-provide 61 kPa (18 in Hg) of vacuum to the modulator with J 23738-A gage/pump (B).

• | Full Line Pressure-provide 0 kPa (0 in Hg) of vacuum to the modulator with J 23738-A gage/pump (B).

• | Note the pressure readings in all gear ranges for both Minimum and Full Line Pressure. Compare these readings with the information in the Line Pressure .

9. Use the High or Low Oil Pressure Condition Diagnosis Charts to diagnose the line pressure readings that are too low or too high.
10. Reconnect the engine vacuum line to the transaxle modulator. Remove J 21867 pressure gage (A) with the engine off. Install the line pressure plug.