P1602
DTC P1602 CONTROL MODULE PROGRAMMING ERROR1. 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.
2. ENABLE CONDITION
Enable Conditions:
3. GENERAL DRIVING CYCLE
Perform diagnosis during 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 if the following conditions are established within 14 seconds after starting the engine.
Time Needed for Diagnosis: 14 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
Normality Judgment
Judge as OK when the following conditions are established after predetermined amount of time has passed.
- Idle speed diagnosis
Judge as NG when all the following conditions are established and judge as OK when not met.
Time Needed for Diagnosis: 6 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
5. DTC CLEAR CONDITION
- When the OK idling cycle is completed 40 times in a row
- When "Clear Memory" is performed
6. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle is completed 3 times in a row
- When "Clear Memory" is performed
7. FAIL SAFE
None
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)