Retrieving Diagnostic Trouble Codes: Notes
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 1998 Toyota Tercel, 1998 Toyota Tacoma, 1998 Toyota T100, 1998 Toyota Supra, and 1998 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Diagnostic Trouble Codes (DTCs) may be retrieved using Toyota scan tool or On-Board Diagnostic (OBD-II) scan tool that complies with SAE standard J-1978. Toyota scan tool or OBD-II scan tool may be operated in NORMAL mode when retrieving trouble codes. Only Toyota scan tool may be used in CHECK mode when retrieving DTCs.
NORMAL mode is used to retrieve DTCs from Engine Control Module (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 switch 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 have been recorded.