Outline Of Diagnosis

• When cold, the abnormality in the control of target engine speed increase is detected. 

  (P050A) 

  • 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. (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.