Suzuki GA413, Service Manual

Page: 830 / 1246

6-54 ENGINE GENERAL INFORMATION AND DIAGNOSIS
GA413
supple
DTC P0134 (No.14) HEATED OXYGEN SENSOR (HO2S) CIRCUIT NO ACTIV-
ITY DETECTED (SENSOR-1)
WIRING DIAGRAM / CIRCUIT DESCRIPTION – Refer to DTC P0130 section.
DTC DETECTING CONDITION POSSIBLE CAUSE
Engine warmed up.
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.
“RED” or “BLU/YEL” circuit open or short
Heated oxygen sensor malfunction
Fuel system malfunction
Exhaust gas leakage
DTC CONFIRMATION PROCEDURE – Refer to DTC P0130 section.
INSPECTION
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Is there DTC(s) other than Fuel system
(DTC P0171/P0172) and HO2S-1 (DTC P0134)? Go to applicable DTC
Diag. Flow Table. Go to Step 3.
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).
Does HO2S-1 output voltage deflect between 0.3
V and over 0.6 V repeatedly?
Go to DTC P0171 and
P0172 Diag. Flow Table
(Fuel System Check). Check “RED” and
“BLU/YEL” wires for
open and short, and
connections for poor
connection. If wires and
connections are OK, re-
place HO2S-1.