Outline Of Diagnosis

Detect the malfunction of catalytic converter initial warm-up retard angle control.

Judge as NG if the ECM is not operating properly when performing catalytic converter initial warm-up retard angle control.

Judge as NG when judged NG in either or both diagnosis of exhaust temperature and diagnosis of idle speed.

• Diagnosis of exhaust temperature

  Judge as NG if the exhaust temperature is below the specified value at 14 seconds after a cold start.

• Diagnosis of idle speed

  Judge as NG when actual engine speed is not close to target engine speed after stopping retard angle control.