When using LEXUS hand-held tester:

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

Check speedometer value.
PREPARATION:
1. Connect the LEXUS hand-held tester to the DLC3.
2. Turn ignition switch ON and LEXUS hand- held tester main switch ON.
3. Select the DATA LIST mode on the LEXUS hand- held tester.
CHECK:

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.
OK:

The speed displayed on the screen of the tester changes as the vehicle speed changes.
1. OK; Replace combination meter.
2. NG: Go to next Step.
Check harness and connector between combination meter and ABS ECU (A/T) combination meter and speed sensor (M/T) (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG: Repair of replace harness or connector.
2. OK: Go to next step.
  Check speed sensor circuit and ABS ECU .