Toyota Tundra Owners Manual: If the engine will not start

The engine will not start even though the starter motor operates 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.

  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 again following correct starting procedures.

• There may be a malfunction in the engine immobilizer system.

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.
• The battery terminal connections may be loose or corroded

The starter motor does not turn over, the interior lights and headlights do not turn on, or the horn does not sound

One of the following may be the cause of the problem:

• One or both of the battery terminals may be disconnected.
• The battery may be discharged.

Contact your Toyota dealer if the problem cannot be repaired, or if repair procedures are unknown.