FixVault

When not using LEXUS hand-held tester:

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check wire harness and connector between combination meter and skid control ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace wire harness or connector. 
    2. OK : Go to next step. 
  2. Check vehicle speed sensor circuit (See  INSPECTION  ). 
    1. OK : Replace combination meter. 
    2. NG : Check and repair speed sensor and wire harness.