Toyota Tundra Service Manual: Check Mode Procedure



(a) Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are stored with 1-trip detection logic.


(a) Make sure that the following conditions are met:

(1) Battery positive voltage 11 V or more.

(2) Throttle valve fully closed.

(3) Shift lever in P or N.

(4) A/C off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine and ECT / Utility / Check Mode.

(f) Check that the MIL flashes as shown in the illustration.


  • All DTCs and freeze frame data will be cleared if: 1) the Techstream is used to change the ECM from normal mode to check mode or vice versa; or 2) during check mode, the ignition switch is turned from ON to ACC or off.
  • Before changing to check mode, make notes of the DTCs and freeze frame data.

(g) Start the engine. The MIL should turn off after the engine starts.

(h) Perform "Monitor Drive Pattern" for the ECT test (See page ), or reproduce the conditions of the malfunction described by the customer.

(i) After reproducing the malfunction conditions, use the Techstream to check the DTCs and freeze frame data.

    Automatic Transmission System

    Data List / Active Test

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