When 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.

Check speedometer value.
PREPARATION:

Connect the LEXUS hand-held tester to the DLC3.

CHECK:
1. Enter DATA LIST function of the LEXUS hand-held tester.
2. When driving the vehicle, check that parameter value of "Speedometer" changes on the screen of the LEXUS hand-held tester.
  NOTE:
  - Be sure to safely route all cables when driving with the tester connected to the vehicle (i.e., keep cables away from feet, pedals, steering wheel and shift lever).
  - persons are required when test driving with the tester: 1 person to drive the vehicle, and 1 person to operate the tester.
1. OK : Replace combination meter (See REMOVAL ).
2. NG : Go to next step.
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 : Check and repair speed sensor and wire harness.