The following may indicate that your vehicle is overheating:
Correction procedures 1. Stop the vehicle in a safe place and turn off the air conditioning system, and then stop the engine. 2. If you see steam: Carefully lift the hood after the steam subsides. If you do not see steam: Carefully lift the hood. 3. After the engine has cooled down sufficiently, inspect the hoses and radiator core (radiator) for any leaks.
If a large amount of coolant leaks, immediately contact your Toyota dealer. 4. The coolant level is satisfactory if it is between the "FULL" and "LOW" lines on the reservoir.
5. Add coolant if necessary. Water can be used in an emergency if coolant is unavailable. 6. Start the engine to check that the radiator cooling fan operates and to check for coolant leaks from the radiator or hoses. 7. If the fan is not operating: Stop the engine immediately and contact your Toyota dealer. If the fan is operating: Have the vehicle inspected at the nearest Toyota dealer.
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Toyota Tundra Service Manual > Engine Immobiliser System (w/o Smart Key System): Engine does not Start but Initial Combustion Occurs
DESCRIPTION If the key ID codes of the key and transponder key ECU assembly match, the engine immobiliser system is unset and the engine start permission signal is sent to the ECM. When the ID codes of the transponder key ECU assembly and ECM match, the engine starts. WIRING DIAGRAM CAUTION / NOTICE ...