Toyota Tundra Service Manual: Check For Intermittent Problems



Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.

  1. Clear the DTCs (See page ).
  2. Switch the ECM from normal mode to check mode using the Techstream (See page ).
  3. Perform a simulation test.
  4. Check and wiggle the harness(es), connector(s) and terminal(s).
    Brake Override System

    Check Mode Procedure

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    Toyota Tundra Owners Manual

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