1A-67 Engine General Information and Diagnosis:
4
A/F sensor and HO2S heater resistance check
1) Disconnect connector from HO2S-2 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.
5
HO2S heater relay power circuit check
1) Remove integration relay No.2 (for J20 engine) (1) or
HO2S heater relay (for M16 engine) (2) with ignition
switch turned OFF.
2) Check for proper connection to relay connector.
3) If connection are OK, measure voltage between each
relay power terminal of relay connector and vehicle body
ground with ignition switch tuned ON.
For J20 engine
For M16 engine
Is each measured voltage 10 – 14 V?
Go to Step 6.
Power circuit is open.
6
Check HO2S heater relay
1) Check integration relay No.2 (for J20 engine) or HO2S
heater relay (for M16 engine) referring to “Control Relay
Inspection: in Section 1C”.
Is it in good condition?
Go to Step 7.
Replace relay.
7
A/F sensor heater circuit check
1) Measure insulation resistance between heater terminals
of A/F sensor connector.
Is measured resistance infinity?
Go to Step 8.
Repair or replace short
wire.
Step
Action
Yes
No
1
I5JB0A110030-02
2
I5JB0A110031-03
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