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Engine
Yes
Measure pre-catalytic oxygen sensor signal circuit.
Step 8
Pre-catalytic Oxygen Sensor
Harness Connector EN02
4
Yes
Step 9
Measure the pre-catalytic oxygen sensor ground circuit.
Pre-catalytic Oxygen Sensor
Harness Connector EN02
4
Yes
Step 10
Replace the pre-catalytic oxygen sensor. Refer to
Step 11
Check the pre-catalytic oxygen sensor signal circuit.
3
2
1
FE02-5043b
3
2
1
FE02-5044b
Control System JL4G18-D
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect oxygen sensor wiring harness connector EN02.
(c)
Turn the ignition switch to "ON" position.
(d)
Measure voltage between Pre-Catalytic oxygen sensor
wiring harness connector EN02 terminal No.4 and a reliable
ground.
Standard Voltage: 0.35-0.5 V
(e)
Connect the pre-catalytic oxygen sensor wiring harness
connector EN02.
Is voltage the specified value?
Go to step 11
No
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect oxygen sensor wiring harness connector EN02.
(c)
Turn the ignition switch to "ON" position.
(d)
Measure resistance between pre-catalytic oxygen sensor
connector EN02 terminal No.3 and a reliable ground.
Standard Resistance: Less than 1 Ω
(e)
Connect pre-catalytic oxygen sensor wiring harness
connector EN02.
Is resistance the specified value?
Go to step 12
No
2.4.7.2 Pre-Catalytic Oxygen Sensor
Go to step 15
Next
EC718/EC718RV EC715/EC715RV 10/2009
2-113
Replacement.
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