Line Pressure Check Procedure

Tools Required 

DT 46450  (DW240-010-02) Oil Pressure Gage Adapter. See Special Tools .

The hydraulic test can inspect the working condition inside the automatic transmission (A/T) by measuring line pressure in drive (D)/reverse (R) range and idle/stall condition.

Fig 1: Line Pressure Test Hole
Courtesy of GENERAL MOTORS CORP.
1. Wedge the 4 wheels and apply the parking brake fully. Lock the vehicle in place.
2. Install the DT 46450  to test the hole (1) for line pressure. See Special Tools .
IMPORTANT: Do not continuously run longer than 5 seconds. Extreme increasing of oil temperature may occur.
3. Fully press on the brake pedal with left foot, shift into drive (D) and reverse (R) range and measure the line pressure idle/stall condition.

   Specifications: 

   • The engine idle line pressure in drive (D) is 0.14-0.37 mPa (20.30-53.70 psi).
   • The engine idle line pressure in reverse (R) is 0.59-0.68 mPa (85.60-98.62 psi).
   • The engine stall line pressure in drive (D) is 1.10-1.23 mPa (159.54-178.40 psi).
   • The engine stall line pressure in reverse (R) is 1.58-1.83 mPa (229.16-265.41 psi).

Make sure to keep interval for more than 1 minute between stall tests.

Make sure to check that there is no oil leak after installing the DT 46450  . See Special Tools .