Toyota Sienna 2010-2025 Owners Manual: If the engine will not start
If the engine will not start even though correct starting procedures are being followed (, 228), consider each of the following points:
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.
- The engine may be flooded.
Try to restart the engine again following correct starting procedures.
(, 228)
- 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 (vehicles with a smart key system)
The engine starting system may be malfunctioning due to an electrical problem such as an electronic key battery depletion or a blown fuse.
However, an interim measure is available to start the engine.
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.
- There may be a malfunction in the steering lock system (vehicle with a smart key system).
Contact your Toyota dealer if the problem cannot be repaired, or if repair procedures are unknown.
Emergency start function (vehicles with a smart key system)
When the engine does not start, the following steps can be used as an interim measure to start the engine if the engine switch is functioning normally:
- Set the parking brake.
- Shift the shift lever to P.
- Turn the engine switch to ACCESSORY mode.
- Press and hold the engine switch for about 15 seconds while depressing the brake pedal firmly.
Even if the engine can be started using the above steps, the system may be malfunctioning. Have the vehicle inspected by your Toyota dealer.
Stowing the spare tire
Lay down the tire with the outer
side (valve stem) facing up, and
install the holding bracket.
Turn the jack handle clockwise
to raise the tire until the tire is in
the correc ...
If the shift lever cannot
be shifted from P
If the shift lever cannot be shifted with your foot on the brake
pedal, there may be a problem with the shift lock system (a system
to prevent accidental operation of the shift lever). Have the
veh ...
Other materials:
Diagnosis system
1. CHECK DLC3
The ECU uses the ISO 15765-4 for communication
protocol. The terminal arrangement of the DLC3
complies with SAE J1962 and matches the ISO
15765-4 format.
NOTICE:
*: Before measuring the resistance, leave the
vehicle as is for at least 1 minute and do not
opera ...
Solar Sensor Circuit (Driver Side)
DESCRIPTION
The solar sensor, which is installed on the upper side of the instrument
panel, detects sunlight and
controls the air conditioning in AUTO mode. The output voltage from the solar
sensor varies according to
the amount of sunlight. When the sunlight increases, the output voltage ...
ABS Warning Light does not Come ON
WIRING DIAGRAM
See page BC-47.
INSPECTION PROCEDURE
1 INSPECT ABS WARNING LIGHT
(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to the ON position.
(c) Check that the ABS warning light comes on.
OK:
ABS warning light comes on.
HINT:
If troubleshooting has be ...
