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INSPECTION
Step
1
Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2
Check Short Term Fuel Trim.
Did short term fuel trim vary within – 20% –
+20% range in step 3) of DTC confirmation
test?
3
Check HO2S-2 for Output Voltage.
Perform steps 1) through 9) of DTC confirma-
tion procedure for DTC P0136 (HO2S-2 mal-
function) and check output voltage of HO2S-2
then.
Is over 0.6 V and below 0.3 V indicated?
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-99
Yes
Go to Step 2.
Go to Step 3.
Replace three way cata-
lytic converter.
No
Go to "ENGINE DIAG.
FLOW TABLE".
Check fuel system.
Go to DTC P0171/P0172
Diag. Flow Table.
Check "BRN" and "YEL"
wires for open and short,
and connections for poor
connection.
If wires and connections
are OK, replace HO2S-2.
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