6-1-62 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
INSPECTION
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check exhaust system for leakage, loose
connection and damage.
Is it good condition?
Go to Step 3. Repair or replace.
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?
Go to Step 4. “G” or “R” circuit open or
HO2S-2 malfunction.
4 Check Short Term Fuel Trim.
Did short term fuel trim very within –20 – +20%
range in step 3) of DTC confirmation test?
Check “R” and “G” wire
for open and short, and
connection for poor
connection. If wire and
connection are OK,
replace HO2S-2.
Check fuel system. Go
to DTC P0171/P0172
Diag. Flow Table.
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