6-56 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
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 HO2S-1 (DTC P0133)? Go to applicable DTC
Diag. Flow Table.
Replace HO2S-1.
DTC P0134 HEATED OXYGEN SENSOR (HO2S) CIRCUIT NO ACTIVITY
DETECTED (SENSOR-1)
WIRING DIAGRAM/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).
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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