| DTC Strategy |
Case 1, 2 |
- Engine speed is below the target while Idle Speed Control (ISC) torque is at the maximum during catalyst heating phase
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- Intake air restriction
- Exhaust restriction
- Engine mechanical concern
- Damaged or sludgy throttle body
- Vacuum leaks
- Damaged ECM
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| Case 3 |
- Fuel cut-off during stand-still, idle condition and catalyst heating phase
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| Enable Conditions |
- Vehicle speed is same as 0km/h (0mph)
- Accelerator pedal is 0%
- After catalyst heating is greater than 0s
- Catalyst heating is active
- ECT at start is between -12 and 42°C (10.4 and 107.6°F)
- IAT is greater than -12°C (10.4°F)
- Barometric pressure is greater than 75.4kPa
- Modelling catalyst temperature is lower than 300°C (572°F)
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| Threshold Value |
Case 1 |
- Difference between target engine speed and actual engine speed is greater than 100RPM
- Difference between maximum idle torque and actual idle torque is less than 10Nm
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| Case 2 |
- Difference between actual engine speed and target engine speed is greater than 200RPM
- Difference between actual idle torque and minimum idle torque is less than 20Nm
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| Case 3 |
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| Diagnostic Time |
- 12s (once per driving cycle)
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| MIL ON Condition |
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