Line Pressure Check Procedure

Line Pressure Check Procedure





Checking line pressures helps to determine if a transmission malfunction is due to a mechanical or an electrical problem. Properly making these pressure checks requires transmission and vehicle (or test stand) preparation, recording of data, and comparing recorded data against specifications provided.

Caution: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.

1. All transmission fluid level and pressure checks must be made at normal operating temperatures 71 - 93°C (160 - 200°F) sump; 82 - 104°C (180 - 220°F) converter-out. Check the transmission fluid level.
2. Connect 0 - 300 PSI (0 - 2070 kPa) oil pressure gauge. Use the Scan Tool to check the engine RPM.
3. Disconnect the driveshaft.
4. With the brakes applied, check the line pressure with the engine running at 2100 RPM and 600 RPM.
5. Continue the procedure for all ranges.