Toyota TUNDRA Oct. 2009 Owners Manual

If the engine will not start

If the engine will not start

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5-2. Steps to take in an emergency
If the engine will not start
If the engine still does not start after following the correct starting
procedure (
P. 183) or releasing the steering lock (
P. 184), confirm
the following points.
The engine will not start even when the starter motor oper-
ates normally.
One of the following may be the cause of the problem.
There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle. (
P. 108)
Flex-fuel vehicles: The type of fuel may be different. When
refueling, add the same type of fuel, if available.
After adding a different type of fuel, the engine may run
roughly and driving performance may be reduced for a while
when the engine is first started. In this case, wait until the
engine runs normally.
The engine may be flooded.
Try to restart the engine once more following correct starting
procedures.
There may be a malfunction in the engine immobilizer system. 
(
P. 113)
The starter motor turns over slowly, the interior lights and
headlights are dim, or the horn does not sound or sounds at
a low volume.
One of the following may be the cause of the problem.
The battery may be discharged. (
P. 633)
The battery terminal connections may be loose or corroded.