Control Solenoid Valve and TCM Assembly Solenoid Performance Test

Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test

Tools Required

DT-47825 Control Solenoid Test Kit





The purpose of this procedure is to test the functionality of the control solenoid (w/body and TCM) valve assembly solenoids for a gross stuck open or stuck closed condition. DT-47825 is bolted to the control solenoid (w/body and TCM) valve assembly on the valve body mounting surface. 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 the valve functionality. The recommended shop air pressure for this test is 90-100 psi.

Important: With the ignition ON and the engine OFF, the transmission control module (TCM) will normally cycle some of the transmission solenoids On and Off to facilitate keeping the ports and solenoids clean and free of debris. This dither function is a normal activity and will cause the valves to cycle open and closed quickly when the TCM is powered up. This can cause the PSI gauge to flicker high and low as the valves open and close. This may cause some air to exit the ports where the PSI gauge 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.

1. Remove the control solenoid (w/body and TCM) valve assembly from the transmission.
2. Bolt the DT-47825 test block to the control solenoid (w/body and TCM) valve assembly on the valve body mounting surface. Use the bolts and washers supplied with the tool to attach the test block. Tighten the bolts to 5 N.m (44 lb in).
3. Install the pressure gage to the affected solenoid air port. Reference component to air port table.
4. Connect the shop air pressure line to the DT-47825 air PSI inlet port.




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 between pressurization tests.
6. With a soft blunt object, depress each TFT Switch Port. The corresponding TFT Switch parameter on the scan tool display should display HI when depressed and Low when released.
7. If the Control Solenoid (w/Body and TCM) Valve Assembly fails any of the above tests. Replace the Control Solenoid (w/Body and TCM) Valve Assembly.







Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Control solenoid (w/body and TCM) valve assembly replacement. Refer to Control Module References for replacement, setup, and programming.