Measuring Main Pressure

Transaxle Main Oil Pressure Port Location:

The following procedure will set a Diagnostic Trouble Code (DTC) into the control module memory. It will be necessary to have a suitable scan tool available to erase this DTC at completion of test.

Prior to performing the following procedure it is recommended that a suitable scan tool be connected to the vehicle as described under "Anti-Lock Brakes" in the "Testing & Inspection" section, then check for and repair any transaxle DTC. Check for other possible stored DTC for other vehicle systems.
If possible perform the following procedure on a chassis dynamometer.
If tests show pressure out of specification the following areas should be inspected.

- Engine idle too high or too low.
- ATF pump faulty.
- Sticking valve in valve body.

1. Connect a suitable transaxle pressure gauge to main pressure port on transaxle, Fig. 8
2. Ensure transaxle oil is at normal operating temperature.
3. Start vehicle and allow to idle.
4. Place shifter in D position and read pressure.
5. Pressure should be between 49-55 psi.
6. Place shifter in R position and read pressure.
7. Pressure should be between 94-109 psi.
8. Disconnect transaxle solenoid valve electrical connector from transaxle.
9. Place shifter in D position, raise engine speed to 2000 RPM and read pressure.
10. Pressure should be between 146-164 psi.
11. Place shifter in R position, raise engine speed to 2000 RPM and read pressure.
12. Pressure should be between 334-348 psi.
13. Stop engine, then remove pressure gauge.
14. Connect transaxle solenoid valve electrical connector to transaxle.
15. Connect a suitable scan tool to vehicle, then erase stored DTC.