Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test
Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test
Special Tools
* DT-47825-100 - Solenoid Test Plate
* DT-47825-20 - Adapter Harness
For equivalent regional tools, refer to Special Tools (6T70/6T75 - Automatic Transmission).
The purpose of this procedure is to test the functionality of the control solenoid valve assembly solenoids for a gross stuck open or stuck closed condition. The DT-47825-100 - test plate is bolted to the control solenoid valve assembly on the valve body mounting surface. Pressurized air is passed into the aluminum test plate, through the control solenoid valve assembly solenoid passage and back to a pressure gauge on the test plate. The pressure gauge 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 gauge, one can determine the valve functionality. The recommended shop air pressure for this test is 90-100 psi.
1. Remove the control solenoid valve assembly from the transmission.
2. Bolt the DT-47825-100 - test plate to the control solenoid valve assembly on the valve body mounting surface. Use the bolts and washers supplied with the tool to attach the test plate. Tighten the bolts to 5 Nm (44 lb in) using a center out alternating torque sequence.
3. Install the pressure gauge to the affected solenoid air port. Reference component to air port table.
4. Connect the shop air pressure line to the DT-47825-100 test plate air psi inlet port.
5. Connect the DT-47825-20 - harness to the vehicle and control solenoid valve assembly.
Caution: Do not energize the solenoids for more than two minutes or the solenoids could be damaged.
6. Ignition ON, with a scan tool command the solenoid in question ON and OFF. Watch the air pressure gauge 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 gauge with a result of pressure reading on the gauge. 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 gauge between pressurization tests.
Note: With the key ON, engine OFF (KOEO), 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 plate and use caution when attaching air to test plate air inlet.