Engine General Information and Diagnosis: 1A-119
DTC P0420: Catalyst System Efficiency below Threshold
S4RS0A1104039
System and Wiring Diagram
Circuit Description
ECM monitors oxygen concentration in the exhaust gas which has passed the warm up three way catalytic converter
by HO2S-2. When the catalyst is functioning properly, the variation cycle of HO2S-2 output voltage (oxygen
concentration) is slower than that of HO2S-1 output voltage because of the amount of oxygen in the exhaust gas
which has been stored in warm up three way catalytic converter.
Reference
Oscilloscope waveforms
DTC Detecting Condition and Trouble Area
C37-11
C37-10
C37-57
WHT
BRN
1
3
2
4
5 V
YEL
YEL
BLU
WHT
BLU WHT
5
I4RS0A110037-
1. HO2S-1
3. Warm up three way catalytic converter
5. ECM
2. HO2S-2
4. Three way catalytic converter
I2RH01110102-
DTC detecting condition
Trouble area
• While vehicle running at constant speed under other than high load.
• Time from rich or lean switching command is output till HO2S-2
output voltage crosses 0.45 V is less than specified value.
(*2 driving cycle detection logic, monitoring once / 1 driving)
• Exhaust gas leak
• Warm up three way catalytic converter
malfunction
• HO2S-2 malfunction
• HO2S-1 malfunction
Содержание SWIFT RS415 2017
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