| Case 1 |
DTC Strategy |
- Engine speed is below the target while ISC torque is at the maximum during catalyst heating phase
|
- Intake air restriction
- Exhaust restriction
- Engine mechanical concern
- Damaged or sludged throttle body
- Vacuum leaks
- Damaged PCM
|
| Threshold Value |
- Difference of Desired engine speed and Engine speed greater than 100rpm
|
| Case 2 |
DTC Strategy |
- Engine speed is above the target while ISC torque is at the minimum during catalyst heating phase
|
| Threshold Value |
- Difference of Desired engine speed and Engine speed less than -200rpm
|
| Case 3 |
DTC Strategy |
- Fuel cut-off during stand-still, idle condition and catalyst heating phase
|
| Threshold Value |
- Fuel cut-off equal to or greater than 3 times
|
| Enable Condition |
- Vehicle speed 0mph
- ECT (Engine Coolant Temperature) at start greater than -10.5° C (13.1°F)
- IAT (Intake Air Temperature) greater than -10.5°C (13.1°F)
- Accel. pedal 0%
- BARO greater than 74.5kPa (10.8psi/0.745bar)
- Catalyst heating Active
|
| Diagnostic Time |
|
| MIL ON Condition |
|