Starting the engine 1. Check that the parking brake is set. 2. Check that the shift lever is set in P. 3. Firmly depress the brake pedal. 4. Turn the engine switch to the "START" position to start the engine. Changing the engine switch positions
■Turning the key from "ACC" to "LOCK" 1. Shift the shift lever to P. 2. Push in the key and turn it to the "LOCK" position.
■If the engine does not start The engine immobilizer system may not have been deactivated. Contact your Toyota dealer. ■When the steering lock cannot be released When starting the engine, the engine switch may seem stuck in the "LOCK" position. To free it, turn the key while turning the steering wheel slightly left and right.
■Key reminder function A buzzer sounds if the driver's door is opened while the engine switch is in the "ACC" or "LOCK" position to remind you to remove the key.
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Toyota Tundra Service Manual > How To Troubleshoot Ecu Controlled Systems: Electronic Circuit Inspection Procedure
ELECTRONIC CIRCUIT INSPECTION PROCEDURE 1. BASIC INSPECTION (a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS (1) Unless otherwise stated, all resistance measurements should be made at an ambient temperature of 20°C (68°F). Resistance measurements may be inaccurate if measured at high temperatures ...