Special Tools

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

The purpose of this procedure is to test the operation of the control solenoid valve assembly for a stuck open or stuck closed solenoid. The DT-47825 bolts to the mounting surface of the control solenoid valve assembly. Pressurized air is routed into the aluminum test block, through the control solenoid valve assembly, and back to the gauge on the test block. See Special Tools .

A pressure gauge is used to measure the pressurized air through the solenoid control ports. When a solenoid is commanded ON with the scan tool, pressurized air flows through the solenoid control port and displays on the pressure gauge. When the solenoid is commanded OFF with the scan tool, there is no pressurized air flow through the solenoid control port to the pressure gauge. The recommended shop air pressure for this test is 620.5-690.4 Kpa (90-100 psi).

Fig 1: Identifying Control Solenoid 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
7	A/Trans Manual Shift Shaft Position Switch Assembly Electrical Connector
8	A/Trans Manual Shift Shaft Position Switch Assembly
9	Bolt M6 x 14.5

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 may cause the valves to cycle open and closed quickly when the TCM is powered up. This can make the pressure gauge needle flicker or move from high and low as the valves open and close, allowing air to exit the ports where the pressure gauge is not connected.

WARNING: Use of eye goggles is necessary to prevent personal injury.

WARNING: To avoid transmission fluid contact with exposed skin, use shop towels to cover the test plate parts in order to prevent fluid from being released into the air, as any remaining transmission fluid in the control solenoid valve assembly will be forced out, and bodily injury may occur.

It is necessary to drain the control solenoid valve assembly of all remaining transmission fluid before attaching the test plate. Use caution when attaching air to the test plate, as any residual transmission fluid in the control solenoid 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.