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Line Pressure

WARNING: This page is about a different car, the 2002 Buick Regal, 2002 Buick Century, 2001 Buick Regal, and 2001 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install a scan tool.
  2. Start the engine and set the parking brake.
  3. Check for a stored Diagnostic Trouble Code (DTC). See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  4. Repair the vehicle, if necessary.
  5. Check the transmission fluid level. See appropriate AUTOMATIC article in TRANSMISSION SERVICING.
  6. Check the manual linkage for proper adjustment. See appropriate AUTOMATIC article in TRANSMISSION SERVICING.
  7. Turn the engine off. Remove the oil pressure test hole plug and install the Pressure Gage (J 21867). See Fig 1 .
  8. Put the gear selector in Park range and set the parking brake.
  9. Start the engine and allow the engine to warm up at idle.
  10. Access the Pressure Control (PC) solenoid valve control test on the scan tool.
  11. Increase the PC solenoid actual current from zero to one amp in 0.1 amp increments. Allow the pressure to stabilize for five seconds after each pressure change. Read the corresponding line pressure on the pressure gauge.
  12. Compare the data to the table. See PC SOLENOID CURRENT & LINE PRESSURE SPECIFICATIONS  table.
  13. If pressure readings differ greatly from the table, see SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
  14. Shut the engine off. Remove the pressure gauge.
  15. Apply sealant (GM P/N 12345382) to the oil pressure test hole plug.
  16. Install the oil pressure test hole plug. Tighten the plug to 106 INCH lbs. (12 N.m).
PC SOLENOID CURRENT & LINE PRESSURE SPECIFICATIONS

PC Solenoid Current (Amps) (1) psi (kg/cm2 )
.0 243-310 (17.1-21.8)
.10 241-308 (16.9-21.7)
.20 234-305 (16.5-21.4)
.30 225-300 (15.8-21.1)
.40 210-288 (14.8-20.2)
.50 190-276 (13.4-19.4)
.60 170-254 (12.0-17.9)
.70 145-222 (10.2-15.6)
.80 115-178 (8.1-12.5)
.90 82-130 (5.8-9.1)
1.00 68-93 (4.8-6.5)
1.10 65-80 (4.6-5.6)
(1) PC solenoid current is increased using scan tool with engine at 1400 RPM.
Fig 1: Installing Oil Pressure Gauge
G98C01963Courtesy of GENERAL MOTORS CORP.
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