Pre-catalytic Oxygen Sensor
FE02-5009b
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect oxygen sensor wiring harness connector.
(c)
Measure heater resistance between the Pre-Catalytic
oxygen sensor terminal No.1 and terminal No.2.
Standard Resistance: 9 Ω(68 ºF) at 20°C
(d)
Connect the Pre-Catalytic oxygen sensor wiring harness
connector.
Is resistance the specified value?
No
Replace the Pre-Catalytic oxygen sensor.
Refer to
Yes
Step 3
Check the terminal No.2 to ground voltage.
FE02-5010b
1
2
3
4
Pre-catalytic Oxygen Sensor Harness Connector
EN02
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect the Pre-Catalytic oxygen sensor wiring harness
connector.
(c)
Turn the ignition switch to "ON" position.
(d)
Measure the Pre-Catalytic oxygen sensor wiring harness
connector EN02 terminal No.1 to ground voltage.
Standard Voltage Value: Voltage between the EN02 terminal No.1
and the ground is 11-14 V.
(e)
Connect the Pre-Catalytic oxygen sensor wiring harness
connector.
Is voltage the specified values?
No
Pre-Catalytic Oxygen Sensor Power Supply
Circuit Fault
Yes
Step 4
Check the Pre-Catalytic oxygen sensor terminal heating control signal continuity.
Engine
Control System JL4G18-D
2-81
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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