Toyota Sienna won’t start – causes and how to fix it

Toyota Sienna won’t start – causes and how to fix it
Toyota Sienna is a reliable road companion, but its a machine with hundreds of interconnected parts, and like any other machine it sometimes fail to deliver normal operation. In this article we go through most common causes of Sienna’s breakdown and how you can fix the problem.
Toyota Sienna won’t start – causes and how to fix itToyota Sienna Fourth Generation XL40 – (photo by Toyota)
The most common causes that hinders normal starting operation of your Sienna are dead key fob battery, dead 12v battery, corrosion on battery terminals, bad alternator, clogged fuel filter, break starter, blown fuse, empty gas tank, immobilizer error or any mistake in the electric system.

1. Weak Battery

If your Sienna ’ s engine won ’ triiodothyronine grouch or cranks very lento, then the most probable perpetrator is a unaccented or dead 12v battery. Investigating more close and doing a battery voltage quiz will clarify whether the start problem is due to the battery. A trial can be done to measure the voltage between the battery poles, check the acidic degree and assess the condition of the crank battery.

If a raw car battery has been installed, the battery may not have even reached its full capacity. There is nothing to worry about. A modern battery only develops its wide capacity over fourth dimension .
Toyota Sienna won’t start – causes and how to fix itToyota Sienna fourth generation XL40 battery location

Test 12v battery

The voltage of the battery on your Toyota Sienna can be measured precisely with a multimeter. Before the test, the multimeter is set to the voltage range of the battery and connected to its plus and minus poles. successful testing of the cable car battery, i.e. checking the voltage, normally results in values ​​of approx. 12 to 13 volts. Values ​​above 14 or below 11.5 volts require an adept assessment of the condition of the car barrage. Because the battery may have a defect with these measured values ​​and must be replaced .

Jump start Toyota Sienna

If dead battery is the reason for the dislocation of your Sienna, you can easily jump begin it using jumper cables and a healthy battery from another vehicle, or using a battery booster if available .
first plug in red cable to the positive terminal of your Sienna ’ s dead battery, then to the positivist concluding of donor battery. adjacent connect black cable to the negative terminal of donor battery, then to the bare metallic element in the locomotive bay of your Sienna. Start the donor vehicle and then your Sienna. Remove the cables in reverse order .
This image has an empty alt attribute; its file name is how-to-jump-start-car-illustration.pngIllustration for jump starting procedure

2. Corrosion on battery

corrosion on the contacts of your car barrage leads to personnel casualty of reach and reduce current stream, which means that your locomotive can nobelium long start by rights.
To know if your Sienna ’ s starting problems are from dirty battery contacts, you need to investigate them. If you lift the rubber covers over the two battery terminals, you can check the terminals for corrosion. If you discover white deposits or silver-green deposits, but no far cracks or damage, you do not have to replace the battery, just clean it .

Clean battery corrosion

To clean the battery on your Toyota Sienna, you have to remove the punt cables first, which requires no especial cognition, precisely a short concentration, as the ordering is very crucial. first remove the bootleg cable from the minus pole. If the perch clamp is identical fast, you can open it with pliers. We advise against using metal pliers, but if you use them, you must make sure that you do not touch any other parts of the consistency. Next you can unplug the crimson positive pole cable. Once the battery has been removed from the circuit, you can start cleaning the corrode battery. After clean, reconnect the terminals .

3. Weak key fob battery

If your Sienna has push start/stop button, then its possible that your fomite may not start due to weak key fob battery. Don ’ thyroxine worry, you can inactive start your vehicle – the battery is alone used to send the sign for locking/unlocking. If the key fob battery is evacuate, the door nobelium longer locks or unlocks at the push of a button. The doors must then be opened manually. The immobilizer is controlled by a passive transponder. passive means, among other things, that the transponder in the key does not need its own power source .

How to start Toyota Sienna with dead key fob battery

If you have a mannequin of Sienna which only has a key fob with start/stop button and no place to insert a key, then try placing your key fob as close to the start/stop clitoris as you can and then start the vehicle. If it doesn ’ thyroxine work, then look in your fomite ’ s operational manual for accurate localization of key fob placement, as it may vary depending on model .
Tip: You can try starting your Sienna with its second key. It will besides rule out any other problem with the beginning key, for model, body of water damage .

4. Broken starter motor

A starter is a drive for starting the engine of your Sienna. The average life of a starter drive is about 100,000 to 150,000 miles, and the life will be shortened if the engine is started more frequently. In any case, since the starter centrifugal besides has a limited biography, it will break down after using the car for a farseeing time, and if the newcomer motive breaks down, the engine will not start .
Symptom: When you turn the key to start the locomotive of your Sienna, you will hear a click strait, which is the sound of a bad starter drive. And if the appetizer centrifugal does not work with a healthy battery, suspect a malfunction of the appetizer .
If the appetizer fails, it normally needs to be replaced with a new one .

Temporary fix for starter

If the engine does not start due to the appetizer, the engine may start if you turn the key while hitting the starter motor with something like a stick or metal tool. This workaround is effective when the parts inside the starter are stuck together or the gears are slenderly out of alignment.

however, it is possible that the starter is nearing the end of its life, so it is recommended that you have it inspected at a trader or sustenance patronize .

5. Defective alternator

An alternator is a generator that produces electricity. If your Sienna ’ s alternator fails, it will not be able to produce electricity and the barrage will not be able to charge. Therefore, even if you think that the cause of the engine not starting is a battery failure and replace the battery, the barrage will soon run out and the engine will not start .
Alternators rarely break down. In particular, modern cars have improved performance, so it is said that they will final 200,000 to 300,000 miles. hush, it can break down depending on how you use it, and in the case of a practice car, the alternator may be quite old. Don ’ thymine let your guard down .
If the alternator breaks down, it must be replaced with a newly alternator .

6. Clogged fuel filter

The fuel filter of your Sienna does not wear out like a mechanical region, but it gets clogged by soil and airborne particles and clogs over time. The permeability of the filter drops, and so does the fuel pressure. To a certain extent this doesn ’ metric ton count, but if the fuel trickle is excessively dirty, the engine will no longer perform at wax capacity and in some exemplify may not start at all. Cleaning is not potential, you can entirely change the percolate .

7. Fuel pump failure

If your Sienna ’ s fuel pump fails, then the engine won ’ thymine beginning. The pump normally ensures that the necessity amount of fuel is passed from the tank to the injection system of the engine with sufficient pressure .
Before your fuel pump stops working, it normally becomes noticeable : if your cable car ’ s engine breaks down from clock to time, the car is unmanageable to start, the engine jerks a little or the engine performance drops, you should have your pump checked .
Wear or contamination of the pump can be the reason for this. If the pump is leaking, a power contact is broken, a line or a pump lever is broken, the fuel heart is normally besides noticeable before failure. You can have a defective fuel pump replaced in your workshop .

8. Blown fuse

In rare cases, a blow fuse could besides be the perpetrator in the breakdown of your Sienna. Check all fuses in the fuse box essential for starting the locomotive. But, be careful when lending a hand yourself to the blend box ! The corner is under power and repairs or tests should always be done in a workshop .

9. Defective spark plugs

Without functioning discharge plugs, the engine will not start. The sparkle chew themselves are frequently not affected by a blemish. alternatively, plug connections on the ignition system come lax. If only one plug is actually loosen, you can fix the problem yourself on site. If a trip plug has failed, it must be replaced in the workshop .

10. Rodent damage

rodent price can be another reason why your Toyota Sienna won ’ thyroxine originate. The animals crawl under the vehicle and bite through cables and wires. In principle, this can affect all fomite systems such as the fuel supply, the oil supply or the power supply .
The rodent damage can normally be seen cursorily by looking into the engine compartment. The damage caused by the rodent morsel can be repaired in the workshop. Be prepared for relatively high costs hera .

11. Engine failure

Although very rare, but it can besides be the cause of the breakdown of your Sienna. If a vehicle has an locomotive failure, then nothing works anymore. It is not uncommon for the driver of a fomite to be responsible for such price. distinctive causes include tearing of the timing belt, incorrect fuel, insufficient oil, hydrolock, overheating of the engine, or continuous driving in an excessive speed stove .
Toyota Sienna won’t start – causes and how to fix itToyota Sienna Platinum engine – fourth generation XL40
only an have mechanic can diagnose engine failure in a workshop .

Use OBD2 scanner for diagnosis

Since Toyota Sienna is equipped with on-board diagnostics ( OBD ), a blame diagnosis can provide initial indications of where the malfunction is located.

To begin troubleshooting, you must first connect the diagnostic creature to your Sienna. The OBDII connection is normally located under the splashboard. With the wire connected, you should turn the ignition on. But be careful not to start the engine. Most diagnostic devices then ask for some information about the vehicle. It is important that you enter this 100 % correctly, otherwise the solution of the search may be falsified. In addition to the vehicle manufacturer and model, you normally besides have to type in the engine and vehicle ID number. For demand trouble-shoot, always check whether the information is adjust .


There are many reasons why your sienna may not start. When looking for the trigger, you should always start with the most obvious cause, the empty battery .
In any subject, it is advisable for laypersons to call a breakdown military service or a workshop. In the consequence of a defect, the latter can directly initiate the repair .

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Category : Car Brakes