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 either the exhaust temperature diagnosis or the idle speed diagnosis becomes NG.

• Exhaust temperature diagnosis

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

• Idle speed diagnosis

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