Check For Intermittent Problems [08/2012 - ]

WARNING: This page is about a different car, the 2013 Lexus IS 350C. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Inspect the 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.

Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2012 - ] .
Switch the ECM from normal mode to check mode using the Techstream. Refer to CHECK MODE PROCEDURE [08/2012 - ] .
Perform a simulation test.
Check and wiggle the harness(es), connector(s) and terminal(s).