Control Solenoid Valve and Transmission Control Module Assembly Inspection: Notes

During transmission manufacturing and assembly, small pieces of material may become dislodged. This may also happen after the transmission has been in operation for a period of time. Because the transmission control solenoid (w/body and TCM) valve assembly is continually immersed in transmission oil, material particles or slivers of metallic debris may become deposited on the control solenoid (w/body and TCM) valve assembly. Often this material is very small and can be hard to see. For this reason, it is important that the control solenoid (w/body and TCM) valve assembly be thoroughly inspected.

A thorough inspection of the control solenoid (w/body and TCM) valve assembly should include the following:

• Clean inspection area - Like all transmission service work, cleanliness is very important. Be sure the area where you are inspecting is free of dust and dirt. Have non-glossy white or lightly colored paper down on the inspection surface. This will enhance the lighting and help to see particles that have come from the control solenoid valve assembly.
• Lighting - Good lighting is necessary for a thorough inspection. If shop lighting is limited, use natural light. A second source of lighting, such as a penlight, is helpful for close examination. A magnifying glass can also be helpful to see into difficult places.
• Cleaning - Clean shop air may be used for spot cleaning as long as the debris can be removed with out it becoming lodged somewhere else. It is best to rinse or flush particles away with GM Brake Parts Cleaner. Do not use a cloth rag to wipe the control solenoid valve assembly, as it could leave lint behind.