DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1): DTC Detecting Condition
DTC DETECTING CONDITION CHART
| Item |
Detecting Condition |
Possible Cause |
| DTC Strategy |
- Check catalyst oxygen storage capacity by evaluation downstream 02 sensor fluctuations
|
- Open or short in signal, ground or power supply circuit
- Contact resistance in connectors
- Misadjusted crankshaft and camshaft pulley position
- Faulty CMP sensor
|
| Enable Conditions |
- Coolant temperature > 74°C (165°F)
- 5km/h(3MPH) < Vehicle speed < 180km/h(112MPH)
- Ambient pressure > 700 hPa
- Engine speed < 3400rpm
- 200 < Mass air flow (mg/rev.) < 700
- [Current engine speed - mean valve] < 500rpm
- [Current engine load - mean valve] < 50mg/rev
- [Current Lambda correction mean value - mean of Lambda correction mean Valve] < 4%
- 400°C(752°) Less than or equal to Catalyst temperature model less than or equal to 900°(1652°F)
- Lambda control active
- Canister Purge Valve not in CLOSE state
- Catalyst purge after Fuel Cut-Off finished
- No relevant failure
- 11V < Battery voltage < 16V
|
| Threshold Value |
- Averaged Malfunction Index > threshold
|
| Diagnostic Time |
- 100 forced stimulation cycles
|
| Mil On Condition |
|