Suzuki SY413 Service Manual page 2771

6-2-54 ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC)
DTC P0134 HEATED OXYGEN SENSOR (HO2S) NO ACTIVITY DETECTED
(SENSOR-1)
WIRING DIAGRAM
Refer to DTC P0130.
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
HO2S voltage is lower than 0.5 V.
(2 driving cycle detection logic)
DTC CONFIRMATION PROCEDURE
Refer to DTC P0133.
TROUBLESHOOTING
STEP
1 Was ENGINE DIAG. FLOW TABLE performed?
2 HO2S-1 Output Voltage Check
1) Connect scan tool to DLC with ignition switch OFF.
2) Warm up engine to normal operating temperature and
keep it at 2000 r / min. for 60 sec.
3) Repeat racing engine (Repeat depressing accelerator
pedal 5 to 6 times continuously to enrich A / F mixture
and take foot off from pedal to enlean) and check
HO2S output voltage displayed on scan tool.
Is over 0.6 V and below 0.4 V indicated?
3 HO2S-1 Check
1) With ignition switch OFF, disconnect HO2S-1 connec-
tor.
2) Check for proper connection to HO2S-1 at each termi-
nal.
3) If ok, connect voltmeter "1" and "2" terminal of HO2S-1
connector.
4) Start engine and check voltmeter while repeating racing
engine.
Is over 0.6 V and below 0.4 V indicated?
4 Short Term Fuel Trim Check
1) Run engine at 2000 r / min. for 60 sec.
2) With engine idling, check short term fuel trim displayed
on scan tool.
Is it within – 20 to +20%?
ACTION
TROUBLE AREA
D HO2S-1
D HO2S-1 circuit
D Fuel system
D Exhaust gas leakage
D ECM
YES
Go to Step 2.
Go to Step 4.
"W" or "Or" circuit
open or short.
If wire and connec-
tions are OK, substi-
tute a known-good
ECM and recheck.
Intermittent trouble
or faulty ECM.
Check for intermit-
tent referring to "In-
termittent and Poor
Connection" in sec-
tion 0A.
NO
Go to ENGINE
DIAG. FLOW
TABLE.
Go to Step 3.
Replace HO2S-1
and recheck.
Go to DTC
P0171/P0172 Diag.
Flow Table.