With OBD II Scan Tool

MALFUNCTION INDICATOR LAMP CHECK
1. The Malfunction Indicator Lamp (MIL) comes on when the ignition switch is turned ON and the engine is not running.

HINT: If the malfunction indicator lamp does not light up, troubleshoot the combination meter.

2. When the engine is started, the malfunction indicator lamp should go off. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.

HOW TO DISPLAY AND READ DIAGNOSTIC TROUBLE CODES (NORMAL MODE)
1. Prepare the OBD II scan tool (complying with SAE J1978).
2. Connect the OBD II scan tool to data link connector 3 in the fuse box at the lower left of the instrument panel.
3. Turn the ignition switch ON and turn the OBD II scan tool switch ON.
4. Use the OBD II scan tool to check the diagnostic trouble codes and freeze frame data. Note them down. (For operating instructions, see the OBD II scan tool's instruction book.)

NOTICE: When simulating symptoms with an OBD II scan tool to check the diagnostic trouble codes, use normal mode. For codes on the diagnostic trouble code chart subject to "2 trip detection logic", turn the ignition switch off after the symptoms have been simulated the first time. Then repeat the simulation process again. When the program has been simulated twice, the MIL lights up and the diagnostic trouble codes are recorded in the Engine Control Module (ECM).




DATA LINK CONNECTOR 3 INSPECTION
The vehicle's ECM uses Variable Pulse Width (VPW) for communication to comply with SAE J1850. The terminal arrangement of DLC 3 complies with SAE J1962 and matches the VPW format.




HINT: If your display shows "UNABLE TO CONNECT TO VEHICLE" when you have connected the cable of the OBD II scan tool or LEXUS hand-held tester to DLC 3, turned the ignition switch ON and operated the scan tool, there is a problem on the vehicle side or tool side.
- If communication is normal when the tool is connected to another vehicle, inspect DLC 3 on the original vehicle.
- If communication is still not possible 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.