Toyota Tundra Service Manual: Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

HINT:

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

    See More:

    Toyota Tundra Service Manual > Trailer Brake Control System: Control Module Communication Bus "A" Off (U0073,U0123,U0129,U0155)
    DESCRIPTION The trailer brake control ECU (brake control with bracket relay) receives signals from the skid control ECU (brake actuator assembly), yaw rate and acceleration sensor (airbag sensor assembly) and combination meter assembly via CAN communication. DTC No. Detection Item INF Code DTC Detec ...

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    Toyota Tundra Service Manual

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