Dtc P0134 Heated Oxygen Sensor (Ho2S) Circuit No Activity Detected (Sensor-1) - Suzuki Ignis Service Manual

DTC P0134 HEATED OXYGEN SENSOR (HO2S) CIRCUIT NO ACTIVITY
DETECTED (SENSOR-1)
WIRING DIAGRAM / CIRCUIT DESCRIPTION
Refer to DTC P0130 section.
DTC DETECTING CONDITION
• Engine warmed up.
• While running under other than high load and high engine speed
conditions or at specified idle speed (engine is in closed loop con-
dition), HO2S-1 output voltage is high or low continuously.
✱2 driving cycle detection logic, Continuous monitoring.
DTC CONFIRMATION PROCEDURE
Refer to DTC P0131 section.
INSPECTION
Step
1 Was "ENGINE DIAG. FLOW TABLE" per-
formed?
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 tem-
perature and keep it at 2000 r/min. for 60
sec.
3) Repeat racing engine (Repeat depressing
accelerator 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
0.3V and over 0.6V repeatedly?
Fig. 1 for Step 3
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-69
POSSIBLE CAUSE
• "WHT" or "ORN" circuit open or short
• Heated oxygen sensor malfunction
• Fuel system malfunction
• 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 Check).
No
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
Check "WHT" and "ORN"
wires for open and short,
and connections for poor
connection. If wires and
connections are OK,
replace HO2S-1.