To check for a potential TCM failure or throttle body problem, you can perform the following steps:

　　Scan for Trouble Codes: Use an OBD-II scanner to retrieve any stored trouble codes related to the transmission or throttle body. These codes can provide valuable information about the specific issue. If you have already retrieved codes like P0700 and P0888, it indicates a problem with the transmission control system.

　　Inspect Wiring and Connections: Visually inspect the wiring harness and connectors associated with the TCM and throttle body. Look for any signs of damage, loose connections, or corrosion. Make sure all connections are securely plugged in.

　　Check Voltage and Ground: Use a multimeter to measure the voltage and ground signals at the TCM and throttle body connectors. Consult a repair manual or wiring diagram to identify the appropriate pins and reference values. Abnormal readings may indicate a wiring or electrical issue.

　　Test TCM Functionality: Some advanced diagnostic tools allow you to perform functional tests on the TCM. These tests can activate various components and monitor their responses. Check the documentation for your specific diagnostic tool to see if this functionality is available.

　　Throttle Body Inspection: Remove the air intake assembly to access the throttle body. Inspect the throttle body for any signs of damage, such as carbon buildup, sticking components, or faulty sensors. Clean the throttle body if necessary using a recommended throttle body cleaner.

　　Throttle Body Actuation Test: If your diagnostic tool supports it, you can perform an actuation test on the throttle body. This test will command the throttle body to open and close, allowing you to observe its movement. Ensure that the throttle body responds correctly and smoothly to the commands.

　　Seek Professional Assistance: If you are unable to diagnose the issue or lack the necessary tools, it's advisable to seek help from a qualified mechanic or dealership. They have specialized diagnostic equipment and expertise to accurately diagnose and repair transmission or throttle body problems.

　　Remember, dealing with transmission and control module issues can be complex. It's important to exercise caution and, if needed, consult a professional for assistance to ensure accurate diagnosis and proper repairs.