| Main Action |
- Calculation of engine roughness
|
- Faulty Spark plugs
- Faulty Spark plug cables
- Air Leakage
- Belt deflection and air gap of CKPS
- Incorrect timing
- Faulty injector
- Improper fuel pressure
- Improper engine compression
|
| Prerequisite condition |
- Engine load ratio is greater than 6.7% to 38%.
- Engine load ratio gradient is lower than 12%/s to 60%/s.
- Engine speed is between 400 rpm and 6700 rpm.
- Barometric pressure (BARO) is greater than 75 kPa.
- Throttle gradient is less than 58.6%/s to 1265.6%/s.
- Engine Coolant Temperature (ECT) is greater than or equal to 20.3°C (68.54°F).
- Battery Voltage is between 11V and 16V.
- Fuel cut off is not active
|
| Threshold Value |
Case 1 |
- Federal Test Procedure (FTP) emission is bigger than OBD emission threshold and lasts 1.4% within 1000 revolutions.
|
| Case 2 |
- Catalyst temperature is higher than 1000°C (1832°F) and lasts 5% to 15% within 200 revolutions.
|
| Diagnosis Time |
Case 1 |
- 1000 revs or 4*1000 revolutions
|
| Case 2 |
- 200 revs or 3*200 revolutions
|
| MIL On Condition |
Case 1 |
|
| Case 2 |
|