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.
| Self-diagnosis result | Example | |||||
|---|---|---|---|---|---|---|
| Diagnosis | Ignition cycle ← ON →OFF← ON →OFF← ON →OFF← ON → |
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| All OK | Case 1 | P0400 | OK (1) | - (1) | OK (2) | - (2) |
| P0402 | OK (1) | - (1) | - (1) | OK (2) | ||
| P1402 | OK (1) | OK (2) | - (2) | - (2) | ||
| SRT of EGR | "CMPLT" | "CMPLT" | "CMPLT" | "CMPLT" | ||
| Case 2 | P0400 | OK (1) | - (1) | - (1) | - (1) | |
| P0402 | - (0) | - (0) | OK (1) | - (1) | ||
| P1402 | OK (1) | OK (2) | - (2) | - (2) | ||
| SRT of EGR | "INCMP" | "INCMP" | "CMPLT" | "CMPLT" | ||
| NG exists | Case 3 | P0400 | OK | OK | - | - |
| P0402 | - | - | - | - | ||
| P1402 | NG | - | NG | NG (Consecutive NG) |
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| (1st trip) DTC |
1st trip DTC | - | 1st trip DTC | DTC (= MIL ON) |
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| SRT of EGR | "INCMP" | "INCMP" | "INCMP" | "CMPLT" | ||
OK: Self-diagnosis is carried out and the result is OK.
NG: Self-diagnosis is carried out and the result is NG.
-: Self-diagnosis is not carried out.
When all SRT related self-diagnoses show OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will indicate "CMPLT". → Case 1 above
When all SRT related self-diagnoses show 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 show NG results in 2 consecutive cycles, the SRT will also indicate "CMPLT". → Case 3 above
The table above shows that the minimum number of cycles for setting SRT as "INCMP" is the number one (1) for each self-diagnosis (Case 1 & 2) or the number 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.
- During SRT driving pattern, the 1st trip DTC (NG) is detected prior to "CMPLT" of SRT and the self-diagnosis memory must be erased from the 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".