1A-71 Engine General Information and Diagnosis:
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
HO2S-2 heater circuit check
1) Measure insulation resistance between heater terminals
of HO2S-2 connector.
Is measured resistance infinity?
Go to Step 8.
Repair or replace short
wire.
8
HO2S heater relay circuit check
1) Measure wire resistance between coil ground terminal of
relay connector and vehicle body ground.
Is measured resistance lower than 1
Ω
?
Output wire of relay
connector is open or
short to ground.
Repair or replace
defective circuit.
9
HO2S-2 heater check
1) Check heater resistance of HO2S-2 referring to “Heated
Oxygen Sensor (HO2S-2) Heater On-Vehicle Inspection:
in Section 1C”.
Is HO2S-2 heater in good condition?
Go to Step 10.
Replace HO2S-2.
Step
Action
Yes
No
1
I5JB0A110030-02
2
I5JB0A110031-03
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