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6-130 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
• While vehicle running at constant speed under other than
high load.
• Time from rich or lean switching command is output till
HO2S–2 output voltage crosses 0.45 V is less than specified
value.
✱2 driving cycle detection logic, monitoring once/1 driving
DTC CONFIRMATION PROCEDURE
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 persons, a driver and a tester, on a level road.
NOTE:
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION
PROCEDURE.
• Intake air temp.: –7°C (19.4°F) or higher
• Engine coolant temp.: –7°C (19.4°F) or higher
• Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Increase vehicle speed to 50 – 60 mph, 80 – 100 km/h. (engine speed: 2500 – 3000 r/min.)
4) Keep above vehicle speed for 10 min. or more (Throttle valve opening is kept constant in this step).
5) Stop vehicle and check if DTC/pending DTC exists using scan tool. If not, check if catalyst monitoring test
has completed using scan tool. If not in both of above checks (i.e., no DTC/pending DTC and catalyst moni-
toring test not completed), check vehicle condition (environmental) and repeat step 3) through 5).
TROUBLESHOOTING
Step
1
Was "Engine and Emission Control System
Check" performed?
2
Exhaust system visual inspection.
1) Check exhaust system for leaks, damage and
loose connection.
Is it in good condition?
3
HO2S–2 output voltage check.
1) Check output voltage of HO2S–2 referring to
"DTC P0137 O2 Sensor (HO2S) Circuit Low
Voltage (Sensor-2)" or "DTC P0138 O2 Sen-
sor (HO2S) Circuit High Voltage (Sensor-2)".
Is check result satisfactory?
Action
TROUBLE AREA
• Exhaust gas leak
• Three way catalytic converter malfunction
• HO2S–2 malfunction
• HO2S–1 malfunction
Yes
Go to Step 2.
Go to Step 3.
Replace three way cata-
lytic converter.
No
Go to "Engine and
Emission Control Sys-
tem Check" in this sec-
tion.
Repair or replace.
Check "WHT" and
"ORN" wires for open
and short, and con-
nections for poor con-
nection.
If wires and connec-
tions are OK, replace
HO2S–2.
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