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)
- Vehicle speed > 5km/h (3MPH)
- Ambient pressure > 700 hPa
- 1200rpm < Engine speed < 3500rpm
- 200 < Mass air flow (mg/rev.) < 780
- Stable driving condition
- Canister load < 0.5
- 300°C (572°F) less than equal less than equal Catalyst temp, model 730°C (1346°F)
- Lambda control/Forced stimulation active
- (VLS_DOWN > 0.68V or < 0.21V) or Catalyst model temp > 500 °C
- Engine operating state Part load
- No relevant failure
- 11V < Battery voltage < 16V
|
| Threshold Value |
- Integral of VLS_DOWN - VLS_DOWN filtered > thd.
|
| Diagnostic Time |
- 20 forced stimulation cycles
|
| Mil On Condition |
|