Suzuki GA413 Service Manual page 835

INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check exhaust system for leakage, loose
connection and damage.
Is it good condition?
3 Check HO2S-2 and Its Circuit.
Was HO2S-2 output voltage indicated on scan tool
in step 3) of DTC confirmation test less than
1.275 V?
4 Check Short Term Fuel Trim.
Did short term fuel trim very within – 20 – + 20%
range in step 3) of DTC confirmation test?
ACTION
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-59
YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
Check "RED" and "BLU"
wire for open and short,
and connection for poor
connection. If wire and
connection are OK,
replace HO2S-2.
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Repair or replace.
"BLU" or "RED" circuit
open or HO2S-2
malfunction.
Check fuel system. Go
to DTC P0171/P0172
Diag. Flow Table.