P1602
DTC P1602 CONTROL MODULE PROGRAMMING ERROR1. OUTLINE OF DIAGNOSIS
Detect malfunctions of the catalyst advanced idling retard angle control.
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle control.
Judge as NG if there is exhaust gas temperature diagnosis, idle speed diagnosis and final ignition timing diagnosis, and if any one of them is NG.
- Exhaust 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 after terminating the 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 temperature diagnosis
Abnormality Judgment
When the diagnostic execution conditions are established, calculate the estimated exhaust temperature. Judge as NG when the following conditions are established after engine starting within the predetermined time.
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 after the predetermined time.
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
Final ignition timing diagnosis
Abnormality Judgment
Judge as NG when the following conditions are established with diagnosis enable conditions successful.
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