Retrieving Diagnostic Trouble Codes: Notes

NOTE: Diagnostic Trouble Codes (DTCs) may be retrieved using Toyota scan tester or On-Board Diagnostic (OBD-II) scan tester that complies with SAE standard J-1978. Toyota scan tester or OBD-II scan tester may be operated in NORMAL mode when retrieving trouble codes. Only Toyota scan tester 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 tester, when ignition switch is turned from ON to ACC or OFF position or scan tester 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.