Special Tools

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

DT-47825 Control Solenoid Test Plate. See Special Tools .

The purpose of this procedure is to test the operation of the control solenoid (w/body and TCM) valve assembly for a stuck open or stuck closed solenoid. The DT-47825 bolts to the mounting surface of the control solenoid (w/body and TCM) valve assembly. See Special Tools . Compressed air is attached to the test block, through the control solenoid (w/body and TCM) valve assembly solenoid passage and back to a pressure gage on the test plate, sent through the control solenoid (w/body and TCM) valve assembly solenoid, and back to the test plate pressure port.

An air pressure gage is used to display the air passing through the solenoid. If the solenoid is unable to allow air through or the air is constantly flowing through the solenoid may be stuck. The scan tool is used to command the solenoids On and Off while watching the air pressure test gage to determine if the solenoid is functioning correctly. The recommended shop air pressure for this test is 620.5-689.4 Kpa (90-100 psi).

Fig 1: View Of Control Solenoid (w/Body & TCM) Valve Assembly With Control Solenoid Test Plate

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	Filter Plate Assembly
2	Control Solenoid Valve Assembly
3	DT-47825 Control Solenoid Test Plate
4	Air Connection Port
5	Transmission 16-Way Pass-Through Connector
6	Electrical Connector Slide Lock

NOTE: To avoid solenoid overheating and possible internal damage, do not continuously operate the solenoid for more than 2 minutes at a time.

The TCM will normally cycle some of the transmission solenoids On and Off to keep the solenoid passages clean and clear, This is a normal function and will cause the valves to cycle open and closed quickly when the TCM is powered up. This will make the pressure gage needle flicker or move from high and low as the valves open and close, allowing air to exit the ports where the pressure gage is not connected.

It is necessary to drain the control solenoid (w/body and TCM) valve assembly of all remaining transmission fluid before attaching the test plate. Use caution when attaching air to the test plate, as any remaining transmission fluid in the control solenoid (w/body and TCM) valve assembly will be forced out. Use shop towels to cover the test plate ports in order to prevent fluid from being released into the air.