Geely EC718 2009 Workshop Manual page 760

2-678 Control System JL4G15-D
Next
Check pre-catalytic oxygen sensor heater resistance.
Step 2
Yes
Step 3 Check terminal D to ground voltage.
Pre-catalytic Oxygen Sensor Harness
Connector EO02
A
Yes
Check pre-catalytic oxygen sensor heater control terminal continuity.
Step 4
EC718/EC718RV EC715/EC715RV 10/2009
B C D
FE02-5352b
Check the existence of following factors that will affect the oxygen
sensor working status:
(a) Exhaust system leakage or blockage.
(b) Water entering the heated oxygen sensor connector.
(c) Engine working at high temperatures, exhaust pipes too hot.
(a) Turn the ignition switch to "OFF" position.
(b) Disconnect oxygen sensor wiring harness connector.
(c) Measure heater resistance between pre-catalytic oxygen
sensor terminals C and D.
Standard Resistance: 9 Ω/20°C (68 ºF)
(d) Connect pre-catalytic oxygen sensor wiring harness
connector.
Is the resistance specified value?
Replace the pre-catalytic oxygen sensor.
No
Refer to
Replacement
(a) Turn the ignition switch to "OFF" position.
(b) Disconnect oxygen sensor wiring harness connector.
(c) Turn the ignition switch to "ON" position.
(d) Measure voltage between Pre-Catalytic oxygen sensor
wiring harness connector EO02 terminal D and a reliable
ground.
Standard Voltage Value: 11-14 V
(e) Connect the pre-catalytic oxygen sensor wiring harness
connector EO02.
Is the voltage specified value?
Pre-Catalytic oxygen sensor heater power
No
supply circuit fault
2.4.7.2 Pre-Catalytic Oxygen Sensor
Engine