Engine General Information and Diagnosis: 1A-70
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: ”.
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check: ”.
2
HO2S-2 heater circuit check
1) Disconnect connector from HO2S-2 with ignition switch
turned OFF.
2) Check for proper connection to HO2S-2 connector.
3) If connection are OK, measure voltage between heater
power terminal of HO2S-2 connector and vehicle body
ground with ignition switch turned ON.
Is measured voltage 10 – 14 V?
Go to Step 9.
Go to Step 3.
3
HO2S heater fuse check
1) Check for “O2 HTR” fuse (1) blown.
For J20 engine
For M16 engine
Is “O2 HTR” fuse in good condition?
Go to Step 5.
Go to Step 4.
4
A/F sensor and HO2S heater resistance check
1) Disconnect connector from A/F sensor with ignition
switch turned OFF.
2) Check heater resistance of A/F sensor and HO2S
referring to “Air Fuel Ratio (A/F) Sensor On-Vehicle
Inspection: in Section 1C” and “Heated Oxygen Sensor
(HO2S-2) Heater On-Vehicle Inspection: in Section 1C”.
Are A/F sensor heater and HO2S heater in good condition?
Go to Step 6.
Replace defective
sensor.
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I5JB0A110028-02
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I5JB0A110029-02
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