Line Pressure
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Line pressures are calibrated for two sets of gear ranges Drive, Park, Neutral and Reverse. This allows the transmission line pressure to be appropriate for different pressure needs in different gear ranges. See LINE PRESSURE RANGE SPECIFICATIONS table.
- Install a scan tool.
- Start the engine and set the parking brake.
- Check for DTCs, including the DTC for a pressure control solenoid.
- Repair the vehicle if necessary. Include the following areas:
- Inspect the fluid level.
- Inspect the manual linkage at the transmission.
- Install or connect the scan tool.
- Install or connect the Pressure Gauge (J 21867) at the line pressure tap.
- Put the gear shift lever in Park and set the parking brake.
- Start the engine and allow the engine to warm up at idle.
- Access the OVERRIDE PRESSURE CONTROL SOLENOID test on the scan tool.
- Increase the Pressure Control (PC) solenoid current in 0.1 amp increments. Read the corresponding line pressure on the pressure gauge. Allow the pressure to stabilize for 5 seconds after each current change.
- Compare your data to the line pressure specifications. See LINE PRESSURE SPECIFICATIONS table.
- Remove the pressure gauge.
- Apply pipe thread sealant with Teflon (GM P/N 12346004) to the line pressure plug. Install the line pressure tap plug. Tighten plug to specification. See TORQUE SPECIFICATIONS .
If your pressure readings differ greatly from the line pressure table, see SYMPTOM DIAGNOSIS under TROUBLE SHOOTING.
The scan tool is only able to control the pressure control solenoid in Park and Neutral with the vehicle stopped at idle. This protects the clutches from extremely high or low pressures in Drive or Reverse ranges.
LINE PRESSURE RANGE SPECIFICATIONS
| Gear Range | Line Pressure Range - psi (kPa) |
|---|---|
| Drive, Park Or Neutral | 35-171 (241-1179) |
| Reverse | 67-324 (162-2234) |
LINE PRESSURE SPECIFICATIONS
| PCS Current (Amp) | Line Pressure - psi (kPa) |
|---|---|
| .02 | 157-177 (1082-1220) |
| .10 | 151-176 (1040-1213) |
| .20 | 140-172 (965-1186) |
| .30 | 137-162 (944-1117) |
| .40 | 121-147 (834-1013) |
| .50 | 102-131 (703-903) |
| .60 | 88-113 (606-780) |
| .70 | 63-93 (434-640) |
| .80 | 43-73 (296-503) |
| .90 | 37-61 (255-420) |
| .98 | 35-55 (241-380) |