Check For Intermittent Problems

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Detect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the hand-held tester is in check mode. In check mode, the hand-held tester uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic.

Clear the DTCs (see DTC CHECK/CLEAR ).
Set the check mode (see CHECK MODE PROCEDURE ).
Perform a simulation test.
Check the connector and terminal (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
Wiggle the harness and the connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).