P050A
DTC P050A COLD START IDLE AIR CONTROL SYSTEM PERFORMANCE1. 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 CONDITIONS
Map 1
Map 2
Map 3
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.
Map 4
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.
Map 5
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