Retrieving Diagnostic Trouble Codes

WARNING: This page is about a different car, the 2002 Toyota Avalon and 2001 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before retrieving DTCs, ensure sufficient battery voltage exists for proper self-diagnosis system operation. Ensure proper operation of the MIL. The MIL will illuminate for all OBD-II DTCs affecting emissions. For additional engine performance or emission system-related DTCs not listed in DIAGNOSTIC TROUBLE CODE DEFINITIONS , see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Connect scan tool to DLC3. DLC3 is located under instrument panel, above pedal assembly. See Figure. Turn the ignition to the ON position. Turn on scan tool. If using the TOYOTA scan tool, ensure tool is in NORMAL mode. CHECK MODE will erase all DTCs. Retrieve any DTCs stored in memory following scan tool instructions. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . Record DTCs and any freeze-frame data.

NOTE: Turning ignition switch to OFF position while in CHECK MODE will erase all DTCs and freeze-frame data.

If using the TOYOTA scan tool, CHECK MODE may be used to detect malfunctions. CHECK MODE has a higher sensing ability as compared to NORMAL MODE. With the TOYOTA scan tool connected to DLC3, turn the ignition to the ON position. Turn scan tool on. Switch the TOYOTA scan tool from NORMAL to CHECK MODE. Ensure the MIL flashes. Start the engine and simulate conditions of malfunction as described by customer. Ignition MUST be on at all times. Check DTCs and freeze-frame data.