Suzuki SY413 Service Manual page 2658

DTC P0134 HEATED OXYGEN SENSOR (HO2S) CIRCUIT NO ACTIVITY
DETECTED (SENSOR-1)
WIRING DIAGRAM/CIRCUIT DESCRIPTION – Refer to DTC P0130 section.
DTC DETECTING CONDITION
D Engine warmed up.
D While running under other than high load and high
engine speed conditions or at specified idle speed
(engine is closed loop condition), HO2S-1 output
voltage is high or low continuously.
: 2 driving cycle detection logic, Continuous monitor-
ing.
DTC CONFIRMATION PROCEDURE – Refer to DTC P0130 section.
INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Is there DTC(s) other than Fuel system
(DTC P0171/P0172) and HO2S-1 (DTC P0134)?
3 Check HO2S-1 and Its Circuit.
1) Connect scan tool to DLC with ignition switch
OFF.
2) Warm up engine to normal operating tempera-
ture and keep it at 2000 r / min. for 60 sec.
3) Repeat racing engine (Repeat depressing ac-
celerator pedal 5 to 6 times continuously and
take foot off from pedal to enrich and enlean
A/ F mixture). See Fig. 1.
Does HO2S-1 output voltage deflect between 0.3
V and over 0.6 V repeatedly?
Fig.1 for Step 3
ENGINE GENERAL INFORMATION AND DIAGNOSIS (G13/G16 ENGINE WITH WU TWC) 6-1-59
ACTION
POSSIBLE CAUSE
D "W", "Or" or "G/R" circuit open or short
D Heated oxygen sensor malfunction
D Fuel system malfunction
D Exhaust gas leakage
YES
Go to Step 2.
Go to applicable DTC
Diag. Flow Table.
Go to DTC P0171 and
P0172 Diag. Flow Table
(Fuel System Chek).
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
Check "W" and "Or" or
"G/R" wires for open
and short, and connec-
tions for poor connec-
tion. If wires and con-
nections are OK, re-
place HO2S-1.