Pressure Readings Proceudre

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Hook up the scan tool.
Start the engine and set the parking brake.

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

Check for a P0748 malfunction code from the pressure control solenoid of the stored transmission. Check for other malfunction codes.
Repair the vehicle if necessary. Include the following areas:
- Inspect the fluid level
- Inspect the manual linkage at the transmission
- Install the J 21867: pressure gage .
Put the gear selector in Park and set the parking brake.
Start the engine and allow the engine to warm up at idle.
Select Special Functions on the scan tool.
Select Trans Output Controls/Pressure Control Solenoid on the scan tool.
Compare your data to the Drive-Park-Neutral line pressure chart above. This line pressure is valid for PC solenoid overrides with the vehicle stopped at idle and in Park-Neutral.

If your pressure readings differ greatly from the line pressure chart, refer to Symptom Tables.