Toyota Tundra Service Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT FUEL CUT-OFF OPERATION

(a) Start and warm up the engine.

(b) Open the throttle valve and keep the engine speed at 3000 rpm.

(c) Use a sound scope to check for injector operating noise.

(d) Check that when the accelerator pedal is released, injector operation noise stops momentarily and then resumes.

If the result is as not specified, check the injector, wiring and ECM.

2. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS

(a) Check that there are no cracks, leaks or damage.

HINT:

Separation of the engine oil dipstick, oil filler cap, ventilation hose, etc. may cause an engine failure or engine malfunctions. Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will allow air suction and cause an engine failure or engine malfunctions.

NOTICE:

  • Detachment or other problems with the engine oil dipstick, filler cap, ventilation hose and other components may cause the engine to run improperly.
  • Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will allow air suction and cause an engine failure or engine failure malfunctions.

If the result is not as specified, replace parts as necessary.

3. INSPECT FUEL CUT-OFF VALVE AND FILL CHECK VALVE

(a) Disconnect the vent line hose from the charcoal canister.

Text in Illustration

*1

Fuel Tank Cap

*2

Charcoal Canister

*3

Vent Line Hose

-

-

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

(c) Fill the fuel tank with fuel.

(d) Apply a pressure of 4 kPa (41 gf/cm2, 0.6 psi) to the vent port of the fuel tank.

HINT:

When the fuel tank is full, the float valve of the fill check valve is closed and there is no ventilation. Therefore, it is necessary to check the fuel amount.

(e) Remove the fuel tank cap and check that the pressure inside the tank drops.

If the pressure does not drop, replace the fuel tank assembly.

(f) Reconnect the vent line hose to the charcoal canister.

4. CHECK AIR INLET LINE

(a) Disconnect the air inlet line hose from the charcoal canister.

(b) Check that there is ventilation in the air inlet line.

If air cannot flow freely into the air inlet line, repair or replace the air inlet line.

(c) Reconnect the air inlet line hose to the charcoal canister.

5. INSPECT SECONDARY AIR INJECTION SYSTEM OPERATION

(a) Start the engine and warm it up.

(b) Turn the ignition switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON and turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP 1: ON, ASV1: OPEN, AIR PUMP 2: ON, ASV2: OPEN and AIR PUMP 1: OFF, ASV1: CLOSE, AIR PUMP 2: OFF, ASV2: CLOSE.

HINT:

When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement) is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and ASV operation can be selected.

(f) Start the engine.

(g) Perform the AIR system intrusive operation while the engine is idling.

(h) Check that the air pump (AIR PUMP), ASV and pressure in the AIR system passage (PRESSURE) status displayed on the Techstream indicate the conditions shown in the table below.

Standard:

Tester Operation

AIR PUMP

ASV

PRESSURE*1

PULSATION*2

AIR PUMP: ON, ASV: OPEN

ON

OPEN

1.9 kPa or more

18 kPa or more

AIR PUMP: OFF, ASV: CLOSE

OFF

CLOSE

Less than 3.0 kPa

Less than 25 kPa

*1:

Average pumping pressure (gauge pressure). The pressure should be 1.9 kPa or more when the AIR system operates.

*2:

The cumulative exhaust pulsation calculated by the ECM. If the calculated value exceeds a certain level, the ECM determines that the exhaust pulsation is in the AIR system.

(i) Turn the ignition switch to off.

NOTICE:

  • This Secondary Air Injection Check only allows technicians to operate the AIR system for a maximum of 5 seconds.

    Furthermore, the check can only be performed up to 4 times per trip. If the test is repeated, intervals of at least 30 seconds are required between checks.

    While AIR system operation using the Techstream is prohibited, the Techstream display indicates the prohibition (WAIT or ERROR).

    If an ERROR is displayed on the Techstream during the test, stop the engine for 10 minutes, and then try again.

  • Performing the Secondary Air Injection Check repeatedly may cause damage to the AIR system. If necessary, leave an interval of several minutes between System Check operations to prevent the system from overheating.
  • When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
  • Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
    Emission Control System

    Parts Location

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