H4SO (2.5L SOHC)
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 judged NG in either or both diagnosis of exhaust temperature and diagnosis of idle speed.
- Diagnosis of exhaust temperature
Judge as NG if the exhaust temperature is below the specified value at 14 seconds after a cold start.
- Diagnosis of idle speed
Judge as NG when actual engine speed is not close to target engine speed after stopping retard angle control.
2. ENABLE CONDITION
Enable Conditions:
3. GENERAL DRIVING
CYCLE Diagnose at cold start.
4. DIAGNOSTIC METHOD
- Diagnosis of exhaust temperature
Abnormality Judgment
Calculate the estimated exhaust temperature when the enable conditions for judgment were established. 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: Illuminates when malfunction occurs in 2 continuous driving cycles.
Normality Judgement
Judge as OK when the following conditions are established after predetermined amount of time has passed.
- Diagnosis of idle speed
Judges NG when all of the following conditions are established, and judge as OK if they are not established.
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)