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Toyota Corolla Engine Serpentine Accessory Belt Replacement Guide
How to change the serpentine accessory belt on the 2ZR-FE 1.8L I4 engine in an 11th generation 2014 to 2018 Toyota Corolla.

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2014 Corolla 2ZR-FE
Pull Off Plastic Cover
Engine Cover Removed
This automotive maintenance tutorial was specifically written to assist owners of the eleventh generation (2014, 2015, 2016, 2017 and 2018) Toyota Corolla in changing the serpentine accessory belt on the 2ZR-FE 1.8 liter inline four cylinder engine.

Owners of other Toyota, Lexus or Scion vehicles such as the Yaris, Matrix, Prius, Camry, RAV4, Sienna, Tacoma, Tundra, FJ Cruiser, Venza, Highlander, Avalon, Sequoia, Land Cruiser, IS 250, ES 350, GS 350, tC, xB, xD, iQ and FR-S may also find these DIY instructions to be helpful.

A few compatible replacement belts with their part numbers are as follows: Bando 6PK1220 or Bando 6PK1230, Dayco 5060485, Toyota 90916-02679 (Japan Built), Toyota # 90916-A2016 (North America Built).

The tools needed to complete this procedure include a 12mm socket, a 14mm socket and a 3/8" drive ratcheting wrench.


Please verify the correct replacement part number for your Toyota Corolla by contacting a dealership, an auto parts store or by using the Amazon Part Finder website. The correct part number will vary depending on whether your Corolla was built in North America or Japan. It also may vary depending on the model year, trim level and if it is equipped with air conditioning.
Left Side of Engine
Alternator & Belt Tensioner
Bolt - Bottom of Alternator
The first two steps are to open the hood and gently pull off the plastic engine cover.

Set the engine cover aside in  a safe place.

If the car has been driven recently, I'd recommend letting the engine cool off for at least an hour or two.

The serpentine accessory belt is located on the left side of the engine.

To release the old belt, you'll need to loosen three bolts.

One bolt is located at the bottom of the alternator.

The second bolt is the tensioner bracket set bolt which is mounted with the bolt head facing toward the left side of the car.

The 3rd and final bolt is the long bolt that tensions the belt by slowly rotating the alternator forwards towards the front of the car.

Mark Tensioner Bolt Position
14mm Bolt - Bottom of Alternator
Loosen Counterclockwise
I'd recommend making a mark on the long tensioner bolt with a marker pen so that you will remember the approximate position.

Loosen the bolt at the bottom of the alternator by turning it counterclockwise with a 14mm socket and a 3/8" drive ratcheting wrench.

Loosen Lower Alternator Bolt
Belt Tension Bracket
Loosen 12mm Bolt
Then loosen the short tensioner bracket set bolt (which also acts as the top alternator mounting bolt) by turning it counterclockwise with a 12mm socket and 3/8" ratcheting wrench.

The top alternator bolt / tensioner bracket set bolt is mounted with the bolt head facing towards the left side of the vehicle.

Loosen Bracket Set Bolt
Loosen Long Tension Bolt
Turn Counterclockwise
Finally, loosen the long belt tensioner bolt at the top of the bracket by turning it counterclockwise.

Continue loosening the long bolt until you can rotate the alternator backwards towards the rear of the car.

Old Belt Loose
Slide Alternator Back
Slip Belt Off Pulley
Once you have loosened the long tensioner bolt enough, you should be able to slip the old serpentine accessory belt off the top of the alternator pulley.
2014-2018-Toyota-Corolla-2ZR-FE-Engine-Serpentine-Accessory-Belt-Replacement-Guide-019 2014-2018-Toyota-Corolla-2ZR-FE-Engine-Serpentine-Accessory-Belt-Replacement-Guide-020 2014-2018-Toyota-Corolla-2ZR-FE-Engine-Serpentine-Accessory-Belt-Replacement-Guide-021
Remove Old Belt
Before you pull the old belt off all the pulleys, take a moment to study how the belt is routed.

A good rule of thumb to remember is that the ribbed side of the belt goes around ribbed pulleys and the smooth side of the belt goes against smooth pulleys.

Lift Belt Out of Engine Bay
Old Belt Removed
Check For Cracks & Splits
Pull the old belt off all of the pulleys and lift it out of the engine bay.

Inspect the old belt. If the old belt doesn't have any major cracks, chunks missing or fraying, you may want to save it for future use.


Examine & Check Pulleys
Crankshaft Pulley - Bottom
Toyota 90916-A2016
To view a belt routing diagram for the 2ZR-FE 1.8L I4 engine, click on the link below. It opens in a new browser window.

2009-2013 Toyota Corolla 2ZR-FE 1.8L I4 Serpentine Accessory Belt Routing Diagram

Lower In New Belt
Wrap Around Crankshaft
Water Pump Pulley
Carefully lower the new belt down in the left side of the engine bay.

Start by wrapping the ribbed side of the belt around the large crankshaft pulley.

Then wrap the ribbed side of the belt around the A/C (air conditioning) compress pulley.

Route the smooth side of the new belt against the back side of the water pump pulley.

Pull Over Alternator Pulley
New Belt Installed
Rotate Alternator Forward
Then pull the top part of the new belt over the ribbed alternator pulley.

Firmly pull the alternator forward until it rotates towards the front of the car and places some tension on the new belt.

Double check that the new belt is routed properly before moving on to the next steps.

Tension On New Belt
Slightly Tighten Set Bolt
Tighten Tensioner Bolt
Slightly tighten the top alternator bolt (tensioner bracket set bolt) with the 12mm socket and 3/8" drive ratcheting wrench just enough to keep the alternator from sliding backwards.

Tighten the long bolt in the clockwise direction to tension the new belt.

Tensioning New Belt
Tighten 12mm Set Bolt
Tighten Lower Alternator Bolt
Repeatedly check the tension on the new belt by trying to twist it at the longest stretch between the crankshaft and the alternator.

The correct tension level is when the new belt can only be twisted to about 90 degrees.

If the belt can be twisted past 90 degrees, the tensioner bolt needs to be tightened a few more turns.

If the belt can not be twisted to 90 degrees, it might be too tight.

Once you believe that the new belt has the correct amount of tension, you can tighten the 14mm bolt at the bottom of the alternator.

Then tighten the top 12mm alternator bolt in the clockwise direction until it is snug.

Fuel Rail & Bracket
Snap Fuel Rail In Socket
Line Up Plastic Engine Cover
If the silver metal fuel rail at the top left of the engine popped out of its mounting bracket while you were installing the new belt, push it back in to place.
Mounting Pegs - Top of Engine
Push On Engine Cover
Serpentine Belt Replaced
Start the engine and listen closely for any sounds that might indicate a problem.

If the belt starts screeching immediately and the sound is constant, turn off the engine immediately. This sound indicates that the new belt might be too tight. So instead of the belt spinning, the crankshaft pulley is just rubbing against it in place.

If the new belt repeatedly makes a "chirp, chirp, chirp" sound that doesn't stop, it might be too loose. The belt might also make a quick screech when the engine starts and then it becomes quiet.

To fix a loose belt, slightly loosen the bottom 14mm alternator bolt, the top 12mm alternator bolt. Then tighten the long tensioner bolt in the clockwise direction a few more turns. Check the tension again by trying to twist the longest stretch of the belt in between the alternator and the crankshaft. If the belt can only be turned to about 90 degrees perpendicular to the rest of the belt, that should be the correct tension.

Once the engine is quiet and seems to be running smoothly, you can replace the plastic engine cover.

Line up the rubber friction fasteners on the bottom of the plastic engine cover with the metal mounting pegs on the top of the engine.

Push the engine cover down in to place.

Be sure to record the serpentine accessory belt change in your car's service records.

For more, check out my other 2014-2018 Toyota Corolla DIY Repair & Maintenance Guides.

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