Geely EC718 2009 Workshop Manual page 756

2-674 Control System JL4G15-D
Yes
Measure pre-catalytic oxygen sensor signal circuit.
Step 8
Pre-catalytic Oxygen Sensor Harness
Connector EO02
A
Yes
Step 9 Measure pre-catalytic oxygen sensor ground circuit.
Pre-catalytic Oxygen Sensor Harness
Connector EO02
A
Yes
Step 10 Replace the pre-catalytic oxygen sensor. Refer to
Step 11 Check pre-catalytic oxygen sensor signal circuit.
EC718/EC718RV EC715/EC715RV 10/2009
B C D
FE02-5348b
B C D
FE02-5349b
(a) Turn the ignition switch to "OFF" position.
(b) Disconnect oxygen sensor wiring harness connector EO02.
(c) Turn the ignition switch to "ON" position.
(d) Measure pre-catalytic oxygen sensor wiring harness
connector terminal No. EO02 B, the voltage between ground
and reliable value.
Standard Voltage Value: 0.35-0.5 V
(e) Connect pre-catalytic oxygen sensor wiring harness
connector EO02.
Is the voltage 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
EO02 terminal A and a reliable ground.
Standard Resistance: Less than 1 Ω
(e) Connect pre-catalytic oxygen sensor wiring harness
connector EO02.
Is the resistance specified value?
Go to step 12
No
2.4.7.2 Pre-Catalytic Oxygen Sensor
Go to step 15
Next
Engine
Replacement.