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 Fig 1.

Fig 1: Determining 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. See Fig 1.

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. See Fig 1.

Fig 1 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 for 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 or SRT, the self-diagnosis memory must be erased from ECM after repair.
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.
• If the 1st trip DTC is erased, all the SRT will indicate INCMP.