CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
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Toyota Tundra Service Manual > Engine Immobiliser System (w/o Smart Key System): Parts Location
PARTS LOCATION ILLUSTRATION *1 UNLOCK WARNING SWITCH ASSEMBLY *2 TRANSPONDER KEY COIL *3 TRANSPONDER KEY ECU ASSEMBLY *4 ECM *5 COMBINATION METER ASSEMBLY (SECURITY INDICATOR LIGHT) *6 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *7 DRIVER SIDE JUNCTION BLOCK ASSEMBLY - ECU-B NO.1 FUSE - ECU-IG2 NO.3 ...