Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

To prevent injury due to contact with an operating V-ribbed belt or cooling fan, keep your hands and clothing away from the V-ribbed belt and cooling fans when working in the engine compartment with the engine running or the engine switch on (IG).

PROCEDURE

1. INSPECT ENGINE COOLANT

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2. INSPECT ENGINE OIL

Click here

3. CHECK BATTERY CONDITION

Click here

4. INSPECT SPARK PLUG

Click here

5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

(a) Remove the air cleaner filter element sub-assembly.

(b) Visually check that the air cleaner filter element sub-assembly is not damaged or excessively oily.

HINT:

  • If there is any dirt or clogs in the air cleaner filter element sub-assembly, clean it with compressed air.
  • If any dirt or clogs remain even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it.

(c) Install the air cleaner filter element sub-assembly.

6. INSPECT V-RIBBED BELT

Click here

7. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY

(a) Remove the V-ribbed belt.

Click here

(b) Turn the V-ribbed belt tensioner assembly clockwise and counterclockwise and check that it turns smoothly and does not catch.

HINT:

If the V-ribbed belt tensioner assembly does not turn smoothly or catches, replace the V-ribbed belt tensioner assembly.

(c) Install the V-ribbed belt.

Click here

8. INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE

(a) Rev up the engine several times. Check that the engine does not emit unusual noises.

(b) If unusual noises occur, warm up the engine and idle it for 30 minutes or more, then perform the inspection.

HINT:

If any defects or problems are found during the inspection, perform valve lash adjuster assembly inspection.

Click here

9. INSPECT IGNITION TIMING

NOTICE:

  • Check the ignition timing with the cooling fans off.
  • Turn off all the electrical systems and the A/C.
  • When checking the ignition timing, the transaxle should be in neutral or park.

(a) Warm up and stop the engine.

(b) When using the Techstream:

(1) Connect the Techstream to the DLC3.

(2) Start the engine and run it at idle.

(3) Turn the Techstream on.

(4) Enter the following menus: Powertrain / Engine / Data List / Ignition Timing Cylinder #1

Powertrain > Engine > Data List

Tester Display

Ignition Timing Cylinder #1

Standard Ignition Timing:

12 to 24° BTDC at idle

(5) Check that the ignition timing advances immediately when the engine speed is increased.

(6) Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / ON.

Powertrain > Engine > Active Test

Active Test Display

Activate the TC Terminal

Data List Display

Ignition Timing Cylinder #1

(7) Monitor Ignition Timing Cylinder #1 of the Data List.

Standard Ignition Timing:

8 to 12° BTDC at idle

(c) When not using the Techstream:

(1) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

SST: 09843-18040

NOTICE:

Confirm the terminal numbers before connecting them. Connecting the wrong terminals may damage electrical components.

*a

DLC3

(2) Remove the front wheel RH.

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(3) Remove the front fender apron seal RH.

Click here

(4) Connect the clip of a timing light to the ignition coil wire for the No. 1 cylinder.

NOTICE:

Use a timing light that detects primary signals.

(5) Start the engine and run it at idle.

(6) Check the ignition timing at idle.

Standard Ignition Timing:

8 to 12° BTDC at idle

HINT:

  • If the cutout of the crankshaft pulley is approximately aligned the protrusion (10° BTDC) of the timing chain cover assembly, the ignition timing meets the standard.
  • Run the engine at 1000 to 1300 rpm for 5 seconds, and then check that the engine speed returns to engine idle speed.

*a

Cutout

*b

10° BTDC

*c

TDC

(7) Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.

(8) Check the ignition timing at idle.

Standard Ignition Timing:

12 to 24° BTDC at idle

(9) Confirm that the ignition timing advances immediately when the engine speed is increased.

(10) Disconnect the clip of the timing light from the ignition coil wire for the No. 1 cylinder.

(11) Install the front fender apron seal RH.

Click here

(12) Install the front wheel RH.

Click here

10. INSPECT ENGINE IDLE SPEED

NOTICE:

  • Check the idle speed with the cooling fans off.
  • Turn off all the electrical systems and the A/C.
  • When checking the idle speed, the transaxle should be in neutral or park.

(a) Warm up and stop the engine.

(b) Connect the Techstream to the DLC3.

(c) Start the engine and run it at idle.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

Powertrain > Engine > Data List

Tester Display

Engine Speed

(f) Read the value displayed on the Techstream.

Standard Idle Speed:

600 to 700 rpm

11. INSPECT COMPRESSION

NOTICE:

Keep the spark plug holes free of foreign matter when measuring the compression pressure.

(a) Warm up and stop the engine.

(b) Check for DTCs.

Click here

(c) Remove the 6 spark plugs.

Click here

(d) Check the cylinder compression pressure.

(1) Insert a compression gauge into the spark plug hole.

(2) Connect the Techstream to the DLC3.

(3) Turn the engine switch on (IG).

(4) Turn the Techstream on.

(5) Enter the following menus: Powertrain / Engine / Active Test / Check the Cylinder Compression / Start.

Powertrain > Engine > Active Test

Tester Display

Check the Cylinder Compression

(6) Depress and hold the brake pedal, and push the engine switch. Then check the compression pressure.

Standard Compression Pressure:

1400 kPa (14.3 kgf/cm2, 203 psi)

Minimum Compression Pressure:

1050 kPa (10.7 kgf/cm2, 152 psi)

Pressure Difference between Each Cylinder:

200 kPa (2.0 kgf/cm2, 29 psi) or less

NOTICE:

  • Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
  • Inspect all cylinders in the same way.
  • Measure the compression pressure as quickly as possible.

(7) If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole then inspect the cylinder compression pressure again.

HINT:

  • If adding oil increases the compression pressure, the piston rings and/or cylinder bore may be worn or damaged.
  • If the compression pressure stays low, a valve may be stuck or seated improperly, or there may be leaks in the cylinder head gasket.

(e) Install the 6 spark plugs.

Click here

(f) Clear the DTCs.

Click here

NOTICE:

After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.

12. INSPECT CO/HC

HINT:

This check determines whether or not the idle CO/HC complies with regulations.

(a) Start the engine.

(b) Run the engine speed at 2500 rpm for approximately 180 seconds.

(c) Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idle.

(d) Immediately check the CO/HC concentration at idle and then at an engine speed of 2500 rpm.

HINT:

When performing a 2 mode test (with the engine idling/running at 2500 rpm), the measurement procedures are determined by applicable local regulations.

If the CO/HC concentration does not comply with the regulations, perform troubleshooting in the order given below.

(1) Check for DTCs.

Click here

(2) See the following table for possible causes, then inspect the applicable parts and repair them if necessary.

CO

HC

Problem

Cause

Normal

High

Rough idle

  1. Faulty ignition:
    • Incorrect valve timing
    • Fouled, shorted or improperly gapped spark plugs
  2. Incorrect valve clearance (valve lash adjuster assembly)
  3. Leaks in intake or exhaust valves
  4. Leaks in cylinders

Low

High

Rough idle

(Fluctuating HC reading)

  1. Vacuum leaks:
    • PCV hoses
    • Intake manifold
    • Throttle body with motor assembly
    • Brake booster line
  2. Lean mixture causing misfire

High

High

Rough idle

(Black smoke from exhaust)

  1. Restricted air cleaner filter element sub-assembly
  2. Plugged PCV valve
  3. Faulty SFI system:
    • Fuel pressure regulator assembly
    • Engine coolant temperature sensor
    • Mass air flow meter sub-assembly
    • ECM
    • Fuel injector assemblies
    • Throttle position sensor (built into throttle body with motor assembly)
    Engine

    Front Crankshaft Oil Seal

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