Tools Required

DT-47825 Control Solenoid Test Plate

The purpose of this procedure is to test the function of the control solenoid (w/ body and TCM) valve assembly solenoids for a gross stuck open or stuck closed condition. Install the DT-47825 to the valve body mounting surface of the control solenoid (w/ body and TCM) valve assembly with bolt. Pressurized air is passed into the aluminum test block, through the control solenoid (w/ body and TCM) valve assembly solenoid passage and back to a pressure gage on the test block. The pressure gage indicates open if air pressure is passed through the solenoid, or closed if the solenoid is unable to pass air through. A scan tool is used to command the solenoids ON and OFF. While watching the pressure gage, one can determine if the valve functions normally. The recommended shop air pressure for this test is between 90-100 psi.

1. Remove the control solenoid (w/ body and TCM) valve assembly from the transmission.
2. Install the DT-47825 to the valve body mounting surface of the control solenoid (w/ body and TCM) valve assembly with bolt. Use the bolts and washers supplied with the tool to install the test block.

Tighten
Tighten the bolts to 5 N·m (44 lb in).

3. Install the pressure gage to the applicable solenoid air vent. Reference component to air vent table.
4. Connect the shop air pressure line to the DT-47825 air psi inlet port.




Important: With the key on, engine off (KOEO), the TCM will normally cycle some of the transmission solenoids On and Off to facilitate keeping the ports and solenoids clean and free of dirty. This dither function is a normally activity and will cause the valves to cycle open and closed quickly when the TCM is powered up. This can cause the psi gage to fluctuate high and low as the valves open and close. This may cause some air to exit the ports where the psi gage is not connected as those solenoids cycle on and off.

Drain the TCM of excess transmission fluid before attaching to test block and use caution when attaching air to test block air inlet.
5. Ignition ON, with a scan tool command the solenoid in question On and Off. Watch the air pressure gage and look for the change in pressure as you command the valve On and Off. The valve should allow air pressure to flow through the valve port to the gage with a result of pressure reading on the gage. If the valve is stuck closed, no pressure change will occur. Command the solenoid valve On and Off several times to determine the state of the solenoid valve in question. Release the air pressure in the gage pressurization tests.