P050A

DTC P050A COLD START IDLE AIR CONTROL SYSTEM PERFORMANCE

1. OUTLINE OF DIAGNOSIS

- When cold, the abnormality in the control of target engine speed increase is detected. (P050A)
Judge as NG if the exhaust gas temperature diagnosis or idle speed diagnosis is NG.
- Exhaust gas temperature diagnosis
Judge as NG when the estimated exhausted gas temperature in 14 seconds after the cold start is below the specified value.
- 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.

2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE
Perform the diagnosis at cold start.

4. DIAGNOSTIC METHOD

- Exhaust gas temperature diagnosis
Abnormality Judgment
Calculate the estimated exhaust gas temperature when the diagnostic enable condition is established. Judge as NG when the following conditions are established.

Time Needed for Diagnosis: 14 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment
Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis: Less than 1 second

- Idle speed diagnosis
Abnormality Judgment
Judge as NG when the following conditions are established.

Time Needed for Diagnosis: 5000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment
Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis: 5000 ms

- Final ignition timing diagnosis
Abnormality Judgment
Judge as NG when the following conditions are established.

Time Needed for Diagnosis: 5000 ms