Retrieving Diagnostic Trouble Codes: Notes

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

NOTE: DTCs may be retrieved using Toyota scan tool or On-Board Diagnostic (OBD-II) scan tool that complies with SAE standard J-1987. Toyota scan tool or OBD-II scan tool may be operated in NORMAL mode when retrieving DTCs. Only Toyota scan tool may be used in CHECK mode when retrieving DTCs.

NORMAL mode is used to retrieve DTCs from ECM. CHECK mode is used to check for DTCs when operating vehicle to simulate conditions in which DTC was set. CHECK mode contains a higher sensing ability to detect malfunctions. CHECK mode helps determine malfunctions caused by poor electrical connections, which are difficult to determine using NORMAL mode.

NOTE: If using Toyota scan tool, when ignition is turned from ON to ACC or OFF position or scan tool is switched from NORMAL mode to CHECK mode, all DTCs and freeze-frame data will be erased. DO NOT switch modes until all DTCs and freeze-frame data are recorded.