Suzuki GA413, Service Manual

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6-80 ENGINE GENERAL INFORMATION AND DIAGNOSIS
GA413
supple
DTC P0420
INSPECTION
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check Short Term Fuel Trim.
Did short term fuel trim vary within – 20% – +20%
range in step 3) of DTC confirmation test? Go to Step 3. Check fuel system.
Go to DTC P0171/P0172
Diag. Flow Table.
3 Check HO2S-2 for Output Voltage.
Perform steps 1) through 9) of DTC confirmation
procedure for DTC P0136 (HO2S-2 malfunction)
and check output voltage of HO2S-2 then.
Is over 0.6 V and below 0.3 V indicated? Replace three way
catalytic converter. Check “RED” and “BLU”
wires for open and
short, and connections
for poor connection.
If wires and connections
are OK, replace
HO2S-2.