Outline Of Diagnosis
- When cold, the abnormality in the control of target engine speed increase is detected. (DTC P050A)
Judge as NG if the idle speed diagnosis is NG.
<Idle speed diagnosis>
Judge as NG when actual engine speed is not close to target engine speed at cold start.
- Detect malfunctions of the catalyst advanced idling retard angle control. (DTC P050B)
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle control.
<Final ignition timing diagnosis>
Judge as NG when actual retard amount is under the specified value at cold start.