Using Hand-Held Tester
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal.
NOTE:
If the display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the hand-held tester to the DLC3, turned the ignition switch ON and operated the hand-held tester, there is a problem on the vehicle side or tool side. If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 of the original vehicle. If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.
- Connect the OBD II scan tool or hand-held tester to the DLC3. DLC3 is located under the left side of the instrument panel. See Fig 1.
- Turn the ignition switch ON and push the hand-held tester switch ON.
- According to the display on the tester, read the DATA LIST and DTC(s); note them down. See Fig 2. Clear DTC(s). Go to next step.
- Operate system for which the complaint was recorded to see if fault can be recreated. The hand-held tester has a Snapshot function which records the monitored data. Please refer to the hand-held tester operator's manual for further details. If same DTC is displayed and fault is present, problem is current in diagnostic circuit, diagnose and repair fault. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If same DTC is not received and no symptoms are present, original DTC was a history code signifying that problem occurred in circuit some time in the past or is a secondary problem. If same DTC is not received, but fault is still present, problem is still occurring somewhere other than current diagnostic circuit. Check that there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with a hand-held tester. See appropriate MULTIPLEX COMMUNICATION SYSTEM - ES 300 article in COMMUNICATION DEVICES. If the same DTC is not received and the fault is not present, the fault may have occurred in the wire harness or connector in the past. Check connectors for loose, damaged or corroded terminals.