SRT Set Timing
SRT is set as CMPLT after self-diagnostics has been performed one or more times. Completion of SRT is done regardless of whether the result is OK or NG. The set timing is different between OK and NG results. See Fig 1.
When all SRT related self-diagnostics showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will indicate CMPLT. Self-diagnosis results have 3 cases. Case 1: When all SRT related self-diagnostics showed OK results through several different cycles, the SRT will indicate CMPLT at the time the respective self-diagnostics have at least one OK result. Case 2: If one or more SRT related self-diagnostics showed NG results in 2 consecutive cycles, the SRT will also indicate CMPLT. Case 3: The minimum number of cycles for setting SRT as INCMP is one for each self-diagnosis (Case 1 and 2) or 2 for 1 of self-diagnostic (Case 3). However, in preparation for the state emissions inspection, it is unnecessary for each self-diagnostics to be executed twice (Case 3) for the following reasons:
- The SRT will indicate CMPLT at the time the respective self-diagnostics have one OK result.
- The emissions inspection requires CMPLT of the SRT only with OK self-diagnosis results.
- When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to CMPLT of SRT, the self-diagnosis memory must be erased from ECM after repair.
- If the 1st trip DTC is erased, all the SRT will indicate INCMP.
SRT can be set as CMPLT together with the DTC(s). Therefore, DTC check must always be carried out prior to the state emission inspection even though the SRT indicates CMPLT. If a vehicle has failed the state emissions inspection due to one or more SRT items indicating INCMP, review the flowchart diagnostic sequence. See Fig 2.