Engine General Information and Diagnosis: 1A-66
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Run engine at idle speed for 1 min. or more.
5) Check DTC and pending DTC.
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
A/F sensor heater circuit check
1) Disconnect connector from A/F sensor with ignition
switch turned OFF.
2) Check for proper connection to A/F sensor connector.
3) If connection are OK, measure voltage between heater
power terminal of A/F sensor 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.
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