Toyota Tundra Service Manual: On-vehicle Inspection




(a) Start the engine and warm it up.

(b) Turn the ignition switch off.

(c) Connect the 400 A probe of an ammeter to the (+) wire of the air pump assembly.

(d) Connect the Techstream to the DLC3.

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

(f) 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.


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.

(g) Measure the current while the air pump assembly is turning.

Standard Current:


Specified Condition

20°C (68°F)

10 to 40 A

(h) Turn the ignition switch to off.


  • 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 Secondary Air Injection 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 Air Injection Check operation finishes.


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