Line Pressure Check Procedure

^ Tools Required
^ J 21867 Pressure Gauge
^ J 23738-A Vacuum Gauge/Pump





1. Check the Fluid. Refer to Transmission Fluid Checking Procedure.
2. Remove the line pressure plug and install J 21867 Pressure Gauge.
3. Disconnect the vacuum line from the transaxle modulator and connect J 23738-A Vacuum Gauge/Pump 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: Total test running time should not be longer than two minutes, or else transmission damage could occur.

4. Start the engine and set the parking brake.
5. Note the vacuum pump gauge:
^ 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 (1,000 ft.).
^ If the engine vacuum is low, refer to Engine, Driveability, and Diagnosis.
6. Disconnect J 23738-A vacuum gauge/pump from the engine vacuum line. Connect J 23738-A vacuum gauge/pump to the transaxle modulator. Install a plug in the engine vacuum line to prevent a vacuum leak.
7. Raise the engine speed to 1,250 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 gauge/pump.
^ Full Line Pressure - provide 0 kPa (0 in Hg) of vacuum to the modulator with J 23738-A gauge/pump.
^ 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 table.
9. Refer to the High or Low Oil Pressure Condition Diagnosis table in order 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 gauge with the engine off. Install the line pressure plug.