Skylark V6-3100 3.1L VIN M SFI (1996)
Shift Modulator: Testing and Inspection
4T60-E LINE PRESSURE CHECK PROCEDURE
Line Pressure Check Procedure Illustration
Transaxle Line Pressure Specification Chart
Notice: Total test running time should not be longer than two minutes, or else transmission damage could occur.
WARNING: Keep the brakes applied at all times In order to prevent unexpected vehicle motion.
1. Check the fluid. Refer to Fluid Level Inspection. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Fluid
Level Inspection
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.
4. Start the engine and set the parking brake.
5. Note the vacuum pump gage:
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At sea level, the engine vacuum should be at least 61 kPa (18" Hg).
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Engine vacuum will drop about 3.5 kPa (1" Hg) for every increase in altitude of 305 m (1000 ft).
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If the engine vacuum is low, refer to Engine for diagnosis.
6. Disconnect J 23738A 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:
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Minimum Line Pressure-provide 61 kPa (18" Hg) of vacuum to the modulator with J 23738-A gage/pump (B).
