SRT Set Timing

SRT is set as CMPLT after self-diagnosis 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 and is shown in the table below.

Fig 1: SRT Set Timing

Courtesy of NISSAN MOTOR CO., U.S.A.

When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will indicate CMPLT. --> Case 1 above

When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indicate CMPLT at the time the respective self-diagnoses have at least one OK result. --> Case 2 above

If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indicate CMPLT. --> Case 3 above

The table in Figure shows that the minimum number of cycles for setting SRT as INCMP is one (1) for each self-diagnosis (Case 1 & 2) or two (2) for one of self-diagnoses (Case 3). However, in preparation for the state emissions inspection, it is unnecessary of each self-diagnosis to be executed twice (Case 3) for the following reasons:

• The SRT will indicate CMPLT at the time the respective self-diagnoses have one (1) 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.
  NOTE: 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.