Tune-Up - Major

Complete major tune-up service including spark plugs, air filter, cabin filter, engine oil change, and throttle body cleaning to restore optimal engine performance and efficiency.

Warnings

Tools required

Parts

• Spark plugs (DENSO or NGK iridium) × 4 — 90919-01253 or equivalent
• Engine oil filter × 1 — 04152-31090 or equivalent
• Engine air filter × 1 — 17801-0V010 or equivalent
• Cabin air filter × 1 — 87139-06050 or equivalent
• Oil drain plug crush washer × 1 — 90430-12031
• PCV valve (if applicable) × 1 — Check service interval

Fluids

• Toyota Genuine 0W-20 — 5 qt

Preparation

1. Ensure engine is completely cold to the touch
2. Park vehicle on level surface and engage parking brake
3. Gather all tools, parts, and fluids before beginning
4. Open hood and prop securely
5. Disconnect negative battery terminal and secure cable away from battery post
6. Raise front of vehicle with jack and secure on jack stands
7. Remove front splash shield if additional access needed for oil change

Procedure

1. 1

   Drain engine oil
   Position drain pan under oil pan drain plug. Using 14mm socket, loosen drain plug carefully. Once loose, finish removing by hand and allow oil to drain completely (5-10 minutes). Inspect drain plug threads and sealing surface for damage. Discard old crush washer and install new crush washer on drain plug. Once oil stops dripping, install drain plug and torque to specification.
   Torque spec

   Oil Drain Plug35 Nm (26 lb-ft)
2. 2

   Replace oil filter
   Locate oil filter on driver side of engine block. Position drain pan underneath as residual oil will spill. Use oil filter wrench to loosen filter, then spin off by hand. Clean filter mounting surface on engine block with lint-free towel. Apply thin film of fresh oil to new filter gasket. Hand-tighten new filter until gasket contacts mounting surface, then rotate an additional 3/4 turn. Do not use wrench for installation.
3. 3

   Replace engine air filter
   Locate air filter housing on driver side of engine bay. Release four spring clips securing air box cover. Carefully lift cover away, disconnecting any attached breather hoses if present. Remove old air filter and inspect housing for debris or moisture. Clean housing interior with damp cloth if needed. Install new air filter ensuring proper orientation (ribbed side typically faces down). Reinstall cover and secure all four clips completely.
   Torque spec

   Air Box Clips5 Nm (4 lb-ft)
4. 4

   Replace cabin air filter
   Open glove box and remove contents. Press inward on both sides of glove box to release stops and lower fully. Locate cabin filter cover on left side behind glove box. Press tabs to remove cover. Slide out old cabin filter, noting airflow direction arrow. Vacuum or wipe filter housing if debris present. Install new filter matching airflow direction arrow. Reinstall cover and reset glove box stops.
5. 5

   Remove ignition coils and access spark plugs
   Locate four ignition coils on top of engine (visible black plastic assemblies with electrical connectors). Disconnect electrical connector from each coil by pressing release tab and pulling straight up. Remove single 10mm bolt securing each coil. Carefully pull each coil straight up with slight twisting motion to break seal. Inspect coil boots for cracks or oil contamination. Use compressed air or shop vacuum to clean debris from spark plug wells before proceeding.
6. 6

   Remove old spark plugs
   Using 14mm spark plug socket with rubber insert, carefully loosen each spark plug. Turn counterclockwise approximately 1-2 full turns to break torque, then verify plug turns freely before removing completely. Remove each plug and inspect electrode wear and color. Gap should show normal light tan/gray deposits. Dark deposits or oil fouling may indicate engine issues requiring attention. Keep plugs organized by cylinder if diagnosis needed.
7. 7

   Install new spark plugs
   Verify new spark plugs are pre-gapped to 0.039-0.043 inches (1.0-1.1mm) specification for this engine. Do not re-gap iridium plugs unless absolutely necessary. Carefully thread each new plug by hand into cylinder head, ensuring straight threading with no resistance. Once hand-tight, use spark plug socket and torque wrench to tighten to 18 Nm (13 lb-ft). Apply small amount of dielectric grease to inside of ignition coil boots if desired.
8. 8

   Reinstall ignition coils
   Align each ignition coil over its corresponding spark plug and press down firmly until coil seats completely (you should feel it click onto plug). Install 10mm mounting bolt for each coil and tighten securely but do not overtighten. Reconnect electrical connector to each coil, ensuring positive click engagement. Verify all four coils are properly secured and connected.
9. 9

   Clean throttle body (optional but recommended)
   Locate throttle body on intake manifold (aluminum housing with large air inlet). Loosen hose clamp on intake tube and disconnect from throttle body. Using throttle body cleaner spray and clean towel, carefully clean throttle plate and bore. Do not force throttle plate open; gently prop with finger while cleaning. Wipe away carbon deposits and cleaner residue. Allow to air dry completely before reconnecting intake tube and tightening clamp securely.
10. 10

    Refill engine oil
    Lower vehicle from jack stands if raised. Locate oil filler cap on top of engine (marked with oil can symbol). Remove cap and insert funnel. Pour in 4.5 quarts of Toyota Genuine 0W-20 oil initially. Wait 2 minutes for oil to settle, then check dipstick level. Add remaining oil in small increments until level reaches between MIN and MAX marks on dipstick. Do not overfill. Install oil filler cap securely.
11. 11

    Reconnect battery and initialize systems
    Reconnect negative battery terminal and tighten securely. Turn ignition to ON position without starting engine. Allow fuel pump to prime and check instrument cluster for warning lights. The system may need to relearn idle and throttle position. Start engine and allow to idle for 30 seconds, observing for unusual noises or vibrations. Check for oil leaks around drain plug and filter.

Reassembly

1. Verify all electrical connectors are properly seated and locked
2. Confirm air filter housing clips are fully engaged
3. Reinstall any splash shields or covers removed during service
4. Double-check oil level on dipstick with engine off and level
5. Verify oil filler cap and drain plug are tight

Verification

• Start engine and verify smooth idle with no misfires or rough running
• Allow engine to reach operating temperature and verify cooling fan cycles normally
• Check for oil leaks around drain plug and filter after 5 minutes of running
• Verify no check engine light or warning lights on instrument cluster
• Test drive vehicle to confirm improved throttle response and smooth acceleration
• After test drive, recheck oil level when engine is warm and on level ground
• Reset maintenance reminder light in instrument cluster per owner's manual procedure

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