Suzuki Swift Sport 2004 User Manual

1A-120 Engine General Information and Diagnosis:
DTC P0420: Catalyst System Efficiency below Threshold
S7RS0B1104046
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
C37-11
C37-10
C37-57
WHT
BRN
1
3
2
4
5 V
YELYEL
BLUWHTBLU WHT
5
I4RS0A110037-01
1. HO2S-1 3. Warm up three way catalytic converter 5. ECM
2. HO2S-2 4. Three way catalytic converter
I2RH01110102-01

Suzuki Swift Sport 2004 Specifications

General

Brand	Suzuki
Model	Swift Sport 2004
Category	Automobile
Language	English