Retrieving Trouble Codes: Notes

NOTE: Trouble codes may be retrieved using Lexus scan tester or On-Board Diagnostic (OBD-II) scan tester that complies with SAE standard J1978. Lexus scan tester or OBD-II scan tester may be operated in Normal Mode when retrieving trouble codes. Only Lexus scan tester may be used in Check Mode when retrieving trouble codes.

Normal Mode is used to retrieve trouble codes from Engine Control Module (ECM). Check Mode is used to check for trouble codes when operating vehicle to simulate conditions in which trouble code 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 Lexus scan tester, when ignition is turned from ON to ACC or OFF position or scan tester is switched from Normal Mode to Check Mode, all trouble codes and freeze frame data will be erased. DO NOT switch modes until all trouble codes and freeze frame data are recorded.