Diagnostic Method
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- Abnormality Judgment
Calculate the continuous time from the sticking of sub feedback control amount to rich or lean side and cumulative deviation (sumdelo 2) of rear oxygen sensor voltage and slice level (target voltage). Judge NG when the malfunction criteria below are completed after 300 seconds have passed continuously.
- Judgment Value JUDGMENT VALUE (ABNORMALITY JUDGMENT)
Malfunction Criteria Threshold Value sumdelo2 = sumdelo2 + (rvo2 - rsl) where:
rvo2 = sensing voltage of secondary oxygen sensor
rsl = target voltage of secondary oxygen sensor> 2300 V Time Needed for Diagnosis : 300 seconds
Malfunction Indicator Light Illumination : Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge OK and clear the NG when the rear oxygen output is reversed, and during 4 seconds after that, the sub feedback control amount does not stick to rich or lean sides.