Check For Intermittent Problems [10/2015 - ]

WARNING: This page is about a different car, the 2019 Lexus GS 300, 2018 Lexus GS 300, 2017 Lexus GS 200t, and 2016 Lexus GS 200t. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Inspect the vehicle 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 [10/2015 - ]
Switch the ECM from normal mode to check mode using the Techstream.
Refer to CHECK MODE PROCEDURE [10/2015 - ]
Perform a simulation test.
Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
Check and wiggle the harness(es), connector(s) and terminal(s).
Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2014 - ]