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Home >> Lexus >> 2007 >> IS 350 >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Control System (4GR-FSE) - SFI System Diagnostics Introduction, Precautions, Fail-Safe Chart, Diagnostic Trouble Code Chart) >> SFI System >> Check For Intermittent Problems

Check For Intermittent Problems

WARNING: This page is about a different car, the 2007 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with an intelligent tester 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 DTC CHECK/CLEAR  ).
  2. Switch the ECM from normal mode to check mode using an intelligent tester (see CHECK MODE PROCEDURE  ).
  3. Perform a simulation test.
  4. Check and wiggle the harness (es), connector (s) and terminal (s).
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