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 FUEL CUT OPERATION

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).

(a) Start the engine.

(b) Warm up the engine.

(c) Increase the engine speed to approximately 3500 rpm.

(d) Use a sound scope to check for fuel injector assembly operating sounds.

(e) When the accelerator pedal is fully released, check that fuel injector assembly operating sounds stop momentarily and then resume.

Standard:

Item

Specified Condition

Fuel cut permission engine speed

2500 rpm or higher

Fuel injection restart engine speed

1400 rpm

If the result is not as specified, check the fuel injector assemblies, wire harness and ECM.

2. VISUALLY CHECK HOSES, CONNECTIONS AND GASKETS

(a) Visually check that the hoses, connections and gaskets have no cracks, leaks or damage.

NOTICE:

  • Detachment or other problems with the engine oil level dipstick, oil filler cap sub-assembly, ventilation hose or other components may cause the engine to run improperly.
  • Air suction caused by disconnections, looseness or cracks in any part of the air induction system between the throttle body with motor assembly and cylinder head sub-assembly will cause engine failure or engine malfunctions.

If any defects are found, replace parts as necessary.

3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM

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).

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Slide the clip and disconnect the fuel vapor feed hose from the purge valve (purge VSV).

(e) Enter the following menus: Powertrain / Engine / Active Test / Activate the EVAP Purge VSV.

Powertrain > Engine > Active Test

Tester Display

Activate the EVAP Purge VSV

(f) Check that vacuum occurs at the purge valve (purge VSV) port.

(g) If vacuum does not occur, check the following items.

  • Purge valve (purge VSV)
  • Clogging in the No. 1 fuel vapor feed hose that connects the intake air surge tank assembly and purge valve (purge VSV)
  • Voltage from the ECM PRG terminal

    Click here

(h) Exit Active Test mode and connect the fuel vapor feed hose to the purge valve (purge VSV) and slide the clip to secure it.

If the result is not as specified, replace the purge valve (purge VSV), wire harness or ECM.

Click here

(i) Enter the following menus: Powertrain / Engine / Data List / EVAP (Purge) VSV.

Powertrain > Engine > Data List

Tester Display

EVAP (Purge) VSV

(j) Warm up the engine and drive the vehicle.

(k) Confirm that the purge valve (purge VSV) opens.

If the result is not as specified, replace the purge valve (purge VSV), wire harness or ECM.

4. CHECK FUEL TANK AND VENT LINE

(a) Disconnect the fuel tank vent hose from the canister (charcoal canister assembly).

*1

Fuel Tank Cap Assembly

*2

Fuel Tank Vent Hose

*a

Pressure Gauge

-

-

(b) Connect a pressure gauge to the fuel tank vent hose.

(c) Apply 4 kPa (0.04 kgf/cm2, 0.6 psi) of pressure to the vent line of the fuel tank assembly.

HINT:

Perform this inspection with the fuel tank assembly less than 90% full. When the fuel tank assembly is full, the fuel fill check valve closes and the pressure is released through the 2 mm (0.0787 in.) orifice. As a result, when the fuel tank cap assembly is removed, the pressure does not decrease smoothly.

(d) Check that the fuel tank assembly pressure is maintained for some time and does not decrease immediately.

HINT:

If the pressure decreases immediately, one of the following may apply:

  • The fuel tank cap assembly is not completely tightened.
  • The fuel tank cap assembly is damaged.
  • Air is leaking from the vent line.
  • The fuel tank assembly is damaged.

(e) Remove the fuel tank cap assembly and check that the pressure is released smoothly.

If the pressure is not released smoothly, replace the fuel tank assembly.

(f) Connect the fuel tank vent hose to the canister (charcoal canister assembly).

5. INSPECT AIR LINE

(a) Disconnect the air line tube from the leak detection pump sub-assembly.

*1

Air Line Tube

*a

Air

(b) Check that air flows freely into the air line.

If air does not flow freely into the air line, repair or replace the air line tube.

(c) Connect the air line tube to the leak detection pump sub-assembly.

    Emission Control System

    Parts Location

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