ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-57
Fig. 1 for Step 3
DTC P0134 HEATED OXYGEN SENSOR (HO2S) CIRCUIT NO ACTIVITY
DETECTED (SENSOR-1)
CIRCUIT DESCRIPTION – Refer to DTC P0130 section.
DTC DETECTING CONDITION POSSIBLE CAUSE
D Engine warmed up.
D While running under other than high load and high
engine speed conditions or at specified idle speed
(engine is in closed loop condition), HO2S-1 output
voltage is high or low continuously.
: 2 driving cycle detection logic, Continuous
monitoring.
D “G” or “R” circuit open or short
D Heated oxygen sensor malfunction
D Fuel system malfunction
D 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 temperature 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 0.3 V and
over 0.6 V repeatedly?
Go to DTC P0171
and P0172 Diag.
Flow Table (Fuel
System Check).
Check “R” and “G”
wires for open
and short, and
connections for
poor connection.
If wires and
connections are
OK, replace
HO2S-1.
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